Samacheer Kalvi Class 9 Science Solutions Chapter 16 Applied Chemistry

Column I	Column II
Indirect dyes	Alizarin
Direct dyes	Congo red
Vat dyes	Indigo
Basic dyes	Methylene blue
Acid dyes	Picric acid

Answer: The table accurately matches various types of dyes with specific examples. For instance, Congo red is a well-known example of a direct dye, commonly used for cotton.
In simple words: This table matches different kinds of dyes with their examples, like how indigo is a vat dye.

🎯 Exam Tip: It is crucial to associate specific chemical examples with their correct dye classification to avoid common errors in this topic.

 

IV. State Whether True or False. If False, Correct the Statement:

 

Question 1. Nanoparticles are difficult to synthesis, isolate, and apply.
Answer: True. Nanoparticles have complex structures, making their creation, separation, and usage challenging.
In simple words: Yes, it is hard to make, separate, and use nanoparticles.

🎯 Exam Tip: When evaluating true/false statements, rely on fundamental definitions and properties, recalling that nanoparticles often present unique handling challenges due to their size and reactivity.

 

Question 2. When cancer occurs, cells are reproduced in a controlled manner.
Answer: False. Correct statement: When cancer occurs, cells are reproduced in an uncontrolled manner. Cancer is characterized by uncontrolled cell division and growth.
In simple words: False. Cancer means cells grow and multiply without any control.

🎯 Exam Tip: Remember that the hallmark of cancer is uncontrolled cell proliferation, which differentiates it from normal cell growth.

 

Question 3. General anaesthetics cause pain along with 'reversible' loss of consciousness.
Answer: False. Correct statement: General anaesthetics relieve pain along with reversible loss of consciousness. The main purpose of anaesthetics is to prevent and relieve pain during medical procedures.
In simple words: False. General anaesthetics stop pain and cause a temporary loss of being awake.

🎯 Exam Tip: Distinguish between the effects of general anaesthetics, which include pain relief and reversible loss of consciousness, from local anaesthetics.

 

Question 4. Malaria decreases body temperature.
Answer: False. Correct statement: Malaria increases the body temperature. Malaria is known for causing cycles of high fever and chills.
In simple words: False. Malaria makes your body temperature go up, causing fever.

🎯 Exam Tip: Recall the classic symptoms of malaria, which prominently include high fever as the body fights the infection.

 

Question 5. High concentration of antibiotics is needed for Effective action.
Answer: False. Correct statement: Low concentration of antibiotics is needed for effective action. Antibiotics are very potent, and too high a concentration can lead to side effects or resistance.
In simple words: False. You only need a small amount of antibiotics for them to work well.

🎯 Exam Tip: Understand the principle of minimum effective dose for antibiotics; higher concentrations are not always better and can lead to adverse effects or microbial resistance.

 

Question 6. Antacids provide relief from burning sensation in the stomach.
Answer: True. Antacids work by neutralizing excess stomach acid.
In simple words: Yes, antacids help stop the burning feeling in your stomach.

🎯 Exam Tip: Know that antacids are bases that neutralize stomach acid, providing quick relief from symptoms like heartburn.

 

Question 7. In Daniel's cell, Zinc metal acts as the cathode, and Copper metal acts as Anode.
Answer: False. Correct statement: In Daniel's cell, Zinc metal acts as Anode, and Copper metal acts as Cathode. Zinc is more reactive than copper, so it loses electrons and gets oxidized at the anode.
In simple words: False. In a Daniel cell, zinc is the anode (where electrons are lost), and copper is the cathode (where electrons are gained).

🎯 Exam Tip: Always remember that in a galvanic cell, the more reactive metal acts as the anode (oxidation) and the less reactive metal acts as the cathode (reduction).

 

Question 8. Radioisotopes can be easily detected and estimated quantitatively.
Answer: True. Their radioactivity allows for precise detection and measurement.
In simple words: Yes, it is easy to find and measure radioisotopes accurately.

🎯 Exam Tip: Understand that the inherent radioactivity of radioisotopes makes them valuable tracers and measurable quantities in various applications.

 

Question 9. Dyes are aromatic compounds originated from plants and insects.
Answer: True. Many natural dyes, like indigo, were traditionally extracted from plants, and cochineal from insects.
In simple words: Yes, dyes are fragrant chemicals that come from plants and insects.

🎯 Exam Tip: Recognize that while synthetic dyes are common today, natural dyes derived from plants and insects have a long history and are still used.

 

Question 10. Dye should be fast to light.
Answer: True. Lightfastness ensures that the dye's color does not fade when exposed to light over time.
In simple words: Yes, a good dye should not fade quickly in sunlight.

🎯 Exam Tip: Good quality dyes must possess properties like lightfastness, washfastness, and resistance to chemical action to ensure durability.

 

Question 11. Vinegar is used as an antioxidant.
Answer: False. Correct statement: Vinegar is used as a preservative. Vinegar's acetic acid helps prevent the growth of bacteria and other spoilage microorganisms.
In simple words: False. Vinegar is used to preserve food, not mainly as an antioxidant.

🎯 Exam Tip: Differentiate between the primary functions of common household substances; vinegar's main role in food is preservation due to its acidity.

 

Question 12. Reduction of alcohol results in oxidation of dichromate to chromic ion.
Answer: False. Correct statement: Oxidation of alcohol results in a reduction of dichromate to chromic ion. In the alcohol test, alcohol is oxidized, while the dichromate is reduced.
In simple words: False. When alcohol gets oxidized, the dichromate chemical is reduced into a chromic ion.

🎯 Exam Tip: Master the concept of coupled redox reactions: if one substance is oxidized, another must be reduced simultaneously.

 

V. Assertion and Reason Type:

 

Question 1. Assertion (A): Nanoparticles interact with impurities. Reason (R) : Nanoparticles are less reactive.
Answer: (c) If assertion is true but reason is false. Nanoparticles are indeed highly reactive and therefore interact readily with impurities. The reason statement incorrectly claims they are less reactive.
In simple words: The first statement (Assertion) is true because nanoparticles easily react with other things. But the second statement (Reason) is false because nanoparticles are actually very reactive.

🎯 Exam Tip: When dealing with Assertion-Reason questions, first determine the truthfulness of each statement individually, then assess if the Reason correctly explains the Assertion.

 

Question 2. Assertion (A): Antiseptic is a substance that prevents infections caused by disease-causing pathogens. Reason (R) : Antiseptics either kill the microorganism or prevent their growth.
Answer: (a) If both assertion and reason are true and Reason is the correct explanation of Assertion. Both statements are true, and the reason accurately describes the mechanism by which antiseptics prevent infections.
In simple words: Both statements are true. The reason explains how antiseptics stop infections by either killing germs or stopping them from growing.

🎯 Exam Tip: For "correct explanation" cases, ensure the reason provides a direct cause-and-effect or mechanistic link to the assertion.

 

Question 3. Assertion (A) : After eating fruits (or) vegetables, one may feel uncomfortable due to a burning sensation. Reason (R) : Burning sensation is due to an imbalance in the acidity of the stomach.
Answer: (d) If assertion is false but reason is true. Eating fruits and vegetables typically does not cause a burning sensation; that is usually associated with oily and spicy foods. However, the burning sensation itself is correctly attributed to stomach acidity imbalance.
In simple words: The first statement is false because fruits and vegetables don't usually cause a burning feeling. But the second statement is true because burning feelings do come from too much stomach acid.

🎯 Exam Tip: Carefully evaluate the specifics of the assertion, as subtle factual inaccuracies can make the entire statement false, even if related concepts are true.

 

Question 4. Assertion (A) : Metals like iron are electroplated with chromium. Reason (R) : Electroplating is done to protect chromium from rusting.
Answer: (c) If assertion is true but reason is false. Iron is indeed electroplated with chromium, so the assertion is true. However, the purpose of electroplating is to protect the *iron* from rusting, not the chromium itself, making the reason false.
In simple words: The first statement is true because iron metals are covered with chromium using electricity. But the second statement is false because the chromium layer protects the iron, not the chromium itself, from rust.

🎯 Exam Tip: Clearly understand the function and direction of protection in electroplating; the coating protects the base metal.

 

Question 5. Assertion (A) : It is possible to detect alcohol drunken drivers. Detection is done through the electrochemical redox reaction of alcohol.
Answer: (a) If both assertion and reason are true and Reason is the correct explanation of Assertion. Both statements are true, and the reason accurately describes the scientific principle behind detecting alcohol in drivers.
In simple words: Both statements are true. The reason explains that alcohol in drivers is found using a special chemical reaction that creates electricity.

🎯 Exam Tip: Recognize the practical applications of electrochemical principles, such as in breathalyzers, where specific chemical reactions lead to measurable outcomes.

 

Question 6. Assertion (A) : Our retinal print can be forged. Reason (R) : Our retinal print is unique.
Answer: (d) If assertion is false but reason is true. Retinal prints are highly unique and extremely difficult to forge, making the assertion false. The uniqueness of retinal prints, as stated in the reason, is correct.
In simple words: The first statement is false because you cannot easily copy someone's retinal print. But the second statement is true because everyone's retinal print is special and different.

🎯 Exam Tip: Understand the strengths and weaknesses of different biometric identification methods, noting that retinal scans offer very high security due to their uniqueness and difficulty to forge.

 

VI. Very Short Answer Type:

 

Question 1. What are the specific qualities of nanoparticles?
Answer: Nanoparticles have several unique qualities. They possess a much larger surface area compared to their volume, leading to high surface energy. They also exhibit spatial confinement and have reduced imperfections in their structure, which gives them special properties.
In simple words: Nanoparticles have a very large surface area, lots of energy on their surface, are very tiny, and have fewer flaws, which gives them special abilities.

🎯 Exam Tip: Focus on the key properties that emerge at the nanoscale: increased surface area to volume ratio, quantum effects (spatial confinement), and enhanced reactivity.

 

Question 2. List out the instruments used to analyse nanoparticles.
Answer: The main instruments used to analyze nanoparticles include the Scanning Electron Microscope (SEM), the Tunneling Electron Microscope (TEM), and the Atomic Force Microscope (AFM). These advanced tools allow scientists to see and study nanoparticles at a very high resolution.
In simple words: Scientists use special microscopes like SEM, TEM, and AFM to look at and study tiny nanoparticles.

🎯 Exam Tip: Be familiar with the advanced microscopy techniques used in nanoscience, understanding that each offers unique capabilities for imaging and analyzing nanostructures.

 

Question 3. What is antipyretics?
Answer: Antipyretics are a class of compounds primarily used to reduce fever. They achieve this by lowering the elevated body temperature back to a normal range. This is a common way to treat fever symptoms.
In simple words: Antipyretics are medicines that bring down a high body temperature or fever.

🎯 Exam Tip: Provide a clear, concise definition of antipyretics and their primary physiological effect, often by listing common examples like paracetamol.

 

Question 6. What are the main sources of Antibiotics?
Answer: The main sources from which antibiotics are produced include different types of tiny living organisms. These are primarily bacteria, fungi, and actinomycetes. These microorganisms naturally create substances that can fight against harmful germs. Microorganisms often compete for resources, and antibiotics help them gain an advantage.
In simple words: Antibiotics mostly come from tiny living things like bacteria, fungi, and actinomycetes.

🎯 Exam Tip: Remember to list at least two distinct categories of microorganisms as sources of antibiotics to show a complete understanding.

 

Question 7. Name any five natural antibiotics.
Answer: Five natural antibiotics are Honey, Garlic, Ginger, Neem, and Turmeric. These natural substances have been used in traditional medicine for their properties that help fight infections. Many plants and natural ingredients have compounds with antibiotic properties.
In simple words: Honey, garlic, ginger, neem, and turmeric are five natural things that can act like antibiotics.

🎯 Exam Tip: When asked for examples, try to recall common, easily recognizable items that have medicinal uses.

 

Question 8. What is an Electrochemical cell?
Answer: An electrochemical cell is a special device that uses chemical changes to make electricity, or uses electricity to cause chemical changes. It essentially links chemical reactions with electrical energy. This means it can either generate power from reactions or use power to drive reactions that wouldn't happen otherwise.
In simple words: An electrochemical cell is a device that turns chemical energy into electrical energy, or electrical energy into chemical energy.

🎯 Exam Tip: Define both aspects of an electrochemical cell: its ability to produce electricity from chemical reactions and its ability to use electricity to drive chemical reactions.

 

Question 9. What is a Daniel cell?
Answer: A Daniel cell is a kind of galvanic cell. In this cell, zinc metal acts as the anode, and copper metal acts as the cathode. It's a classic example of an electrochemical cell that converts chemical energy into electrical energy through spontaneous redox reactions. This setup allows for a controlled electron flow, generating a steady current.
In simple words: A Daniel cell is a type of battery where zinc is the anode and copper is the cathode, making electricity from chemicals.

🎯 Exam Tip: Key points for Daniel cell are identifying the anode (zinc) and cathode (copper), and understanding its function as a galvanic (voltaic) cell.

 

Question 10. What is radioactive decay?
Answer: Radioactive decay is when unstable isotopes of elements lose their energy by giving off radiation. This process helps them become more stable. It's a natural atomic process where an unstable atomic nucleus loses energy by emitting radiation, transforming into a different element or an isotope of the same element. This is why some materials are called "radioactive".
In simple words: Radioactive decay is when an unstable atom releases energy as radiation to become stable.

🎯 Exam Tip: Mention both parts of the definition: unstable isotopes losing energy and releasing radiation to achieve stability.

 

Question 11. What is Vermicompost?
Answer: Vermicompost is a type of natural fertilizer. It is made from domestic waste materials with the help of earthworms. Earthworms play a crucial role in breaking down organic matter, turning it into nutrient-rich compost that greatly benefits soil and plant growth. This process is an eco-friendly way to manage organic waste.
In simple words: Vermicompost is a natural fertilizer made from household waste by earthworms.

🎯 Exam Tip: Highlight that vermicompost is a natural fertilizer and explicitly state that earthworms are key to its production from domestic waste.

 

Question 12. What is a balanced diet?
Answer: A balanced diet is one that includes all three important types of food in the correct amounts. These food types are bodybuilding foods, energy-giving foods, and protective foods. Eating a balanced diet ensures that the body receives all the necessary nutrients to function properly, grow, and stay healthy. It is essential for overall well-being.
In simple words: A balanced diet has the right mix of foods for building muscles, giving energy, and protecting health.

🎯 Exam Tip: Clearly list the three categories of food (bodybuilding, energy-giving, protective) and mention the importance of "right proportion".

 

Question 13. Mention the use of a Biometric system.
Answer: A biometric system is used to check a person's identity. It does this by comparing their unique body prints, like fingerprints or retinal scans, with existing data stored in the system. This method provides a secure and reliable way to verify who someone is, often used for access control and security purposes. Biometric systems are effective because each person's unique physical traits are difficult to duplicate.
In simple words: A biometric system helps identify a person by matching their unique body features with saved information.

🎯 Exam Tip: Focus on the core function: verifying identity by comparing unique physical traits with stored data.

VII. Answer Briefly

 

Question 1. What is called as Applied Chemistry?
Answer: Applied chemistry is about using chemical rules and ideas to get specific results or solve real-world problems. It takes scientific knowledge from chemistry and puts it into practice to create new products, develop new processes, or improve existing ones. For example, creating new medicines or making materials stronger involves applied chemistry.
In simple words: Applied chemistry uses chemical knowledge to solve practical problems and make new things for the real world.

🎯 Exam Tip: Emphasize both the practical application of chemical principles and the goal of solving real-world problems.

 

Question 2. Mention medical applications of Nanochemistry.
Answer: Nanochemistry helps in medicine by using very tiny materials for different purposes. Nanomaterials are used to make synthetic skin and in implant surgeries. They are also being developed for targeted drug delivery and advanced diagnostics, bringing revolutionary changes to medical treatments.
In simple words: Nanochemistry in medicine helps make synthetic skin, perform surgeries, and create very small conductors for electronics.

🎯 Exam Tip: Provide at least two clear examples of how nanochemistry directly benefits the medical field, such as synthetic skin or implants.

 

Question 3. Mention medical applications of Nanorobotics.
Answer: Nanorobotics is used in medicine and space technology. It plays a significant role in biomedicine, especially in treating diseases like cancer. These tiny robots can be designed to perform highly precise tasks within the human body, such as delivering drugs directly to diseased cells or performing microscopic surgeries, leading to more effective treatments with fewer side effects.
In simple words: Nanorobotics is used in medicine and space; it helps treat diseases like cancer in biomedicine.

🎯 Exam Tip: Clearly state its use in medicine and mention a key disease it helps treat, like cancer.

 

Question 4. Define Drug.
Answer: According to the World Health Organisation (WHO), a drug is any substance or product that is used or meant to be used to change how the body works or to treat diseases, for the benefit of the person using it. Drugs interact with the body's systems to produce a specific effect, whether it's pain relief, curing an infection, or managing a chronic condition.
In simple words: A drug is a substance used to change how the body works or to treat sickness, to help a person.

🎯 Exam Tip: Ensure your definition includes both the purpose (modify physiological systems/treat pathological states) and the beneficiary (recipient).

 

Question 5. What is an Analgesics? How is it useful?
Answer: Analgesics are compounds that help relieve all kinds of pain without making a person lose consciousness. They are useful for treating headaches, muscle pain (myalgia), and joint pain (arthralgia). These medications work by targeting pain pathways in the body, providing comfort while allowing the individual to remain alert and aware. This makes them different from anesthetics, which cause a loss of sensation.
In simple words: Analgesics are medicines that stop pain without making you unconscious. They are good for headaches, muscle pain, and joint pain.

🎯 Exam Tip: Define analgesics by their key characteristic (pain relief without loss of consciousness) and give at least two examples of their uses.

 

Question 6. What is known is Antibiotics?
Answer: Antibiotics are special chemical compounds made by many microorganisms, like bacteria, fungi, and molds. These compounds stop the growth or metabolism of other disease-causing microorganisms. They are vital in treating bacterial infections by either killing the bacteria or preventing them from multiplying, allowing the body's immune system to fight off the infection effectively.
In simple words: Antibiotics are chemicals made by tiny organisms that stop the growth of other harmful germs.

🎯 Exam Tip: Highlight that antibiotics are chemicals produced by microorganisms and their function is to inhibit or kill other disease-causing microorganisms.

 

Question 7. Write brief notes on processes involved in cell reactions.
Answer: An electrochemical cell involves two main reactions happening at the same time: oxidation and reduction.
• Oxidation: This is when a metal loses electrons and forms metal ions. It takes place at the anode, which is the positive electrode. Metal \( \rightarrow \) Metal ion \( + \) electron(s)
• Reduction: This is when a metal ion gains electrons and turns back into a metal. It happens at the cathode, which is the negative electrode. Metal ion \( + \) electron(s) \( \rightarrow \) Metal. These two processes occur simultaneously, creating a flow of electrons that generates electricity. This transfer of electrons is fundamental to how batteries and fuel cells work.
In simple words: In a cell, two reactions happen: oxidation (losing electrons) at the anode, and reduction (gaining electrons) at the cathode.

🎯 Exam Tip: Clearly define both oxidation (loss of electrons) and reduction (gain of electrons), stating where each occurs (anode and cathode, respectively).

 

Question 8. How does a galvanic cell produce electricity?
Answer: In a galvanic cell, electricity is produced through a chemical reaction.
• At the anode, an oxidation reaction happens, which releases electrons.
• These electrons then flow through an external wire to the cathode, where a reduction reaction takes place as ions gain these electrons.
• As electrons move from the anode to the cathode, this flow creates an electric current. This spontaneous movement of electrons is what generates electricity. The salt bridge completes the circuit by allowing ion movement to maintain electrical neutrality.
In simple words: A galvanic cell makes electricity because electrons are released at the anode (oxidation) and then flow to the cathode (reduction).

🎯 Exam Tip: Explain the electron flow from anode (oxidation) to cathode (reduction) and state that this flow generates electricity.

 

Question 9. Mention the applications of electroplating with an example.
Answer: Electroplating has several useful applications:
• It protects metals from rusting and corrosion. For example, chrome-plating makes surfaces resistant to rust.
• It is used to make the surface of a metal look nicer, like gold plating on jewelry.
• It can repair broken machine parts by depositing a layer of metal between them. Electroplating creates a durable and aesthetically pleasing finish while also enhancing the functional properties of the base metal. This process is widely used in industries from automotive to jewelry.
In simple words: Electroplating is used to stop rust, make things look good (like gold plating), and fix broken machine parts.

🎯 Exam Tip: Provide at least two distinct applications (protection, beautification, repair) and an example for one of them.

 

Question 10. List out the characteristics of Dye.
Answer: Dyes have several key characteristics:
• They should have a suitable and strong color.
• They must be able to stick and fix themselves to the fabric.
• They should be resistant to fading from light (fast to light).
• They should not be easily washed away or damaged by water, weak acids, and bases (alkalies). These properties ensure that the dye provides a lasting and vibrant color to the material. The ability to bond with the material is crucial for permanent coloring.
In simple words: Dyes need good color, must stick to fabric, should not fade in light, and should resist water and chemicals.

🎯 Exam Tip: List at least three characteristics, focusing on color, fastness, and resistance to environmental factors.

 

Question 11. Define Pesticides.
Answer: According to the World Health Organisation (WHO), pesticides are chemical compounds used to kill pests. These pests include insects, rodents, fungi, and unwanted plants (weeds). Pesticides are designed to protect crops and prevent disease by controlling organisms that harm plants or animals. However, their use must be managed carefully due to environmental and health concerns.
In simple words: Pesticides are chemicals that kill harmful pests like insects, rodents, fungi, and weeds.

🎯 Exam Tip: Emphasize that pesticides are chemical compounds used to kill various types of pests, including insects, fungi, and weeds.

 

Question 12. How can Fingerprints be identified?
Answer: Fingerprints can be identified in a few ways:
• On smooth surfaces, they can be seen by putting light or dark powder on them.
• Hidden (occult) fingerprints can be made visible using a chemical called Ninhydrin, which turns them purple.
• Very powerful laser light can also be used to make fingerprints visible. These methods rely on the unique patterns of ridges and valleys on human fingertips, which leave behind traces of oils and sweat. These unique patterns are then analyzed for identification. Even if not visible to the naked eye, these traces can be chemically enhanced.
In simple words: Fingerprints are found using powders on smooth surfaces, Ninhydrin for hidden ones, or strong laser light.

🎯 Exam Tip: List at least two distinct methods for revealing fingerprints, distinguishing between visible and latent (hidden) prints.

 

Question 13. How is alcohol consumption detected?
Answer: Alcohol consumption can be detected using a breath test.
• The person being tested blows through a tube. This makes their breath bubble through a solution that contains sulphuric acid, potassium dichromate, water, and silver nitrate.
• The alcohol in their breath gets oxidized, causing the dichromate to change color from orange to green. The color change indicates the presence and amount of alcohol. This chemical reaction provides a quick and effective way to measure blood alcohol content indirectly.
In simple words: Alcohol in breath is found by blowing into a tube with a special solution; the solution changes color from orange to green if alcohol is present.

🎯 Exam Tip: Describe the key chemical indicator (potassium dichromate) and the color change (orange to green) that signals alcohol presence.

 

Question 14. What is Chemotherapy?
Answer: Chemotherapy is a treatment for certain diseases that involves using specific organic compounds to destroy the invading organisms without harming the host's cells. It is widely used to treat cancer. Chemotherapy drugs target rapidly dividing cells, which is a characteristic of cancer cells, but can also affect healthy rapidly dividing cells, leading to side effects.
In simple words: Chemotherapy is a treatment that uses special drugs to kill disease-causing organisms, often used for cancer, without hurting the healthy body cells too much.

🎯 Exam Tip: Define chemotherapy by its purpose (destroying invading organisms/cancer cells) and its mechanism (using organic compounds) while minimizing host cell damage.

VIII. Answer in detail :

 

Question 1. Draw the cell diagram of Daniel cell. Give its reactions.
Answer:The Daniel cell involves the following reactions:
At anode (Oxidation): Zinc metal loses electrons and gets oxidized. \( \text{Zn(s)} \rightarrow \text{Zn}^{2+}\text{(aq)} + 2\text{e}^- \)
At cathode (Reduction): Copper ions gain electrons and get reduced to copper metal. \( \text{Cu}^{2+}\text{(aq)} + 2\text{e}^- \rightarrow \text{Cu(s)} \)
Net reaction: Adding the two half-reactions gives the overall cell reaction. \( \text{Zn(s)} + \text{Cu}^{2+}\text{(aq)} \rightarrow \text{Zn}^{2+}\text{(aq)} + \text{Cu(s)} \) The cell potential of a Daniel cell is typically \( 1.1 \) V. In this cell, the chemical energy released from the redox reaction is converted into electrical energy, demonstrating the principles of electrochemistry. A salt bridge is used to complete the circuit and maintain charge neutrality by allowing ion flow.
In simple words: In a Daniel cell, zinc gives up electrons (oxidation) at the anode, and copper ions take these electrons (reduction) at the cathode. These reactions together make electricity.

🎯 Exam Tip: Clearly write out the half-reactions for both anode and cathode, specify oxidation and reduction, and then provide the balanced net reaction and standard cell potential. While a diagram would ideally accompany this, focus on accurately detailing the chemical processes.

 

Question 2. Daniel cell
Answer: This question appears to be incomplete. Please provide the full question for a complete answer.
In simple words: The question is not finished. Please give the whole question.

🎯 Exam Tip: Always read the full question before attempting to answer, and if a question seems incomplete, make a note of it or ask for clarification.

 

Question 3. List the applications of Nanochemistry.
Answer: Nanochemistry has many applications across different fields:
• Metallic nanoparticles can act as very effective catalysts, speeding up chemical reactions.
• Chemical sensors using nanoparticles and nanowires become much more sensitive and selective, allowing for better detection of substances.
• Nanocoatings and nanocomposites are used to make things like sports equipment, bicycles, and cars.
• Nanotechnology is used to make synthetic skin and in implant surgeries.
• Nanomaterials that conduct electricity are used in electronics for tiny conductors in microchips.
• Nanomaterials are used in cosmetics, deodorants, and sunscreens, and they improve moisturizers by making them less oily.
• Nanoparticle substances are added to fabrics to stop bacteria from growing. Nanochemistry's impact is far-reaching, from enhancing the performance of electronics to revolutionizing medical treatments and consumer products. Its ability to manipulate matter at the atomic level opens up new possibilities for innovation.
In simple words: Nanochemistry helps make strong catalysts, better sensors, special coatings for things like bikes and cars, synthetic skin for surgery, tiny parts for electronics, and antibacterial fabrics.

🎯 Exam Tip: List a diverse range of applications, including examples from catalysis, sensors, manufacturing, medicine, and consumer products, to show a broad understanding.

 

Question 4. Mention the drawbacks of Nanomaterials in chemistry.
Answer: While nanomaterials have many benefits, they also have some drawbacks:
• Nanoparticles are unstable when they react with oxygen, which can sometimes lead to problems.
• Their exothermic combustion with oxygen can easily cause an explosion because they have a high surface area.
• Because they are very reactive, nanoparticles often interact with impurities.
• Nanomaterials are generally considered harmful and toxic to living things.
• It is hard to make, separate, and apply them correctly.
• There are currently no clear and strict rules for how to safely get rid of nanomaterials. These drawbacks highlight the need for careful research, handling, and regulation of nanomaterials to ensure their safe and responsible development and use.
In simple words: Nanomaterials can be unstable with oxygen, explode easily, react with impurities, are often toxic, hard to make, and lack clear disposal rules.

🎯 Exam Tip: List at least three significant drawbacks, focusing on instability, reactivity, toxicity, and handling challenges.

 

Question 5. Account the role of Radioactive isotopes in Diagnosis and treatment in the Medical field?
Answer: Radioactive isotopes play a crucial role in diagnosing and treating many diseases in the medical field. Some examples include:

These isotopes are powerful tools that allow doctors to see inside the body and target specific areas for treatment. Their controlled use has revolutionized medical diagnostics and therapeutics, saving countless lives. The specific radiation they emit can be detected externally or used to destroy diseased cells.
In simple words: Radioactive isotopes help doctors find diseases and treat them, like finding brain tumors, checking blood flow, and treating cancer.

🎯 Exam Tip: Present the information in a clear, organized table format, ensuring each radioisotope is matched with its correct diagnostic or treatment application.

 

Question 6. Give a comparative account of various drugs with their application and examples.
Answer: Different types of drugs serve various purposes in medicine, each with specific applications and examples:

These drugs are essential in modern medicine, each targeting specific health issues to improve patient well-being. Understanding their purposes helps in selecting the right treatment for various conditions. Each type of drug works through different chemical mechanisms to achieve its therapeutic effect.
In simple words: Different drugs like anaesthetics, analgesics, antipyretics, antiseptics, antimalarials, antibiotics, and antacids are used for different health problems, like pain, fever, or infections.

🎯 Exam Tip: Organize your answer using a table with clear columns for the drug type, its purpose, and at least one relevant example for each category.

 

Question 7. Mention the applications of electrochemistry?
Answer: Electrochemistry has several practical applications:
• It has helped discover crucial industrial processes for making and purifying non-ferrous metals and for creating organic compounds using electricity.
• Electrochemistry helps predict if a particular chemical reaction will happen.
• It makes it possible to detect alcohol in drunken drivers through a chemical redox reaction of ethanol.
• It is used in the production of metals like aluminum and titanium from their ores.
• Blood sugar meters for diabetes use electrochemistry to measure glucose levels.
• Lead-acid batteries, lithium-ion batteries, and fuel cells all work based on electrochemical principles.
• Fuel cells directly convert chemical energy into electrical energy. Electrochemistry is vital for many technologies we use daily, from energy storage to diagnostic tools and material production. Its broad applicability stems from its ability to control and understand electron transfer.
In simple words: Electrochemistry is used to make and purify metals, predict reactions, find alcohol in breath, make batteries, and measure blood sugar.

🎯 Exam Tip: List a variety of applications, ensuring to include examples from industrial processes, analytical techniques, and energy storage devices like batteries.

 

Question 8. Explain very briefly about various fields of Applied Chemistry.
Answer: Applied chemistry extends to many diverse fields, each with unique applications:
• Nanochemistry: This field of nanoscience applies chemical knowledge to very small materials (nanomaterials) and nanotechnology. A nanometer is \( \frac{1}{1,000,000,000} \) of a meter.
• Pharmaceutical chemistry: This area focuses on making drugs and studying their chemical makeup, natural properties, actions, and structure, and how they affect living systems.
• Electrochemistry: This deals with the link between electrical energy and chemical changes, which is crucial for batteries and many industrial processes.
• Radiochemistry: This involves studying the chemistry of radioactive and non-radioactive isotopes, used in medicine and energy.
• Dye chemistry: This field specifically studies different types of dyes and how they are used.
• Agricultural chemistry: This applies chemical and biochemical knowledge to farm production, processing raw food products, and checking environmental health.
• Food chemistry: This involves looking at, processing, packaging, and using materials in food.
• Forensic chemistry: This uses scientific rules, techniques, and methods to investigate crimes. Each of these fields shows how chemical principles are applied to solve practical problems and advance technology, illustrating the vast impact of applied chemistry on everyday life. Applied chemistry truly touches almost every aspect of our existence.
In simple words: Applied chemistry covers many areas like making tiny materials (nanochemistry), making medicines (pharmaceutical chemistry), studying electricity and chemicals (electrochemistry), studying radioactive materials (radiochemistry), and looking at dyes, farming, food, and crime solving.

🎯 Exam Tip: Provide a concise definition for each mentioned field of applied chemistry, highlighting its main focus or application.