Official Class 8 Science Worksheets: Carbon and its Compounds
Access comprehensive chapter-wise worksheets for Carbon and its Compounds using the CBSE Class 8 Science Carbon and its Compounds Worksheet Set 01. Designed to align with the 2026-27 academic syllabus for Class 8 Science, these printable practice sets help students reinforce key concepts and improve their overall exam readiness.
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A. Check Point
1. What are the forms of carbon around us? 2. Name two natural forms.
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Answer: Carbon occurs as diamond, graphite and fullerenes (crystalline forms) and as charcoal, coke, lampblack and gas carbon (amorphous forms). Diamond and graphite are natural forms.
Teacher's Note: Use the key term in your answer.
3. What are organic compounds? How do they differ from inorganic compounds?
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Answer: Organic compounds contain carbon and hydrogen and are usually obtained from living things, such as sugar and methane. Inorganic compounds come from minerals and non-living things, such as salt and water. Organic compounds usually burn and have low melting points.
Teacher's Note: Give an example if the question allows.
3. What is allotropy?
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Answer: The property of an element to exist in different forms with the same chemical properties but different physical properties. The different forms are called allotropes.
Teacher's Note: Write a short, clear answer.
4. Why is diamond hard?
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Answer: Each carbon atom is bonded to four others by strong bonds in a rigid, three-dimensional network, so it is the hardest known natural substance.
Teacher's Note: Remember this for your exam.
5. What is the carbon cycle?
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Answer: The carbon cycle is the continuous movement of carbon among the air, plants, animals and soil. Plants take carbon dioxide from air for photosynthesis; animals eat the plants; respiration, burning of fuels and decay return carbon dioxide to the air.
Teacher's Note: Learn this point and write it in your own words.
6. Why is graphite a solid lubricant? 7. Why is it good for electrodes?
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Answer: Its layers are held weakly and slide over each other, so it is slippery. It is also a good conductor of electricity, because it has free electrons.
Teacher's Note: Use the key term in your answer.
8. Two uses each of diamond and graphite.
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Answer: Diamond: jewellery and cutting glass. Graphite: pencil leads and electrodes.
Teacher's Note: Give an example if the question allows.
9. Why is the name fullerene given to the allotrope with 60 atoms? 10. Future uses?
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Answer: C-60 looks like the geodesic dome designed by the architect Buckminster Fuller, so it is called buckminsterfullerene. Possible uses are in medicine, as lubricants and in electronics.
Teacher's Note: Write a short, clear answer.
1. How is amorphous carbon different from crystalline forms?
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Answer: Amorphous carbon has no regular arrangement of atoms, while crystalline forms (diamond, graphite) have a definite pattern.
Teacher's Note: Remember this for your exam.
2. Names of amorphous forms. 3. Uses of charcoal, animal charcoal and coke.
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Answer: Amorphous forms: charcoal, coke, lampblack and gas carbon. Charcoal: fuel and in gas masks; animal charcoal: decolourising sugar; coke: fuel and in making iron.
Teacher's Note: Learn this point and write it in your own words.
4. An organic substance is burnt completely in the absence of air. What is formed? 5. What is gas carbon?
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Answer: (b) Amorphous carbon. Gas carbon is a hard form of carbon deposited in gas retorts, used for making electrodes.
Teacher's Note: Use the key term in your answer.
1. Poisonous nature of carbon monoxide. 2. One reducing property. 3. The scheme to promote LPG in rural areas.
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Answer: Carbon monoxide combines with the haemoglobin of blood and stops it carrying oxygen, so it is poisonous. It reduces metal oxides to metals. The scheme is the Pradhan Mantri Ujjwala Yojana.
Teacher's Note: Give an example if the question allows.
B. Keywords
13. Define: allotropy, asphyxia, hydrocarbon.
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Answer: Allotropy: existence of an element in different forms. Asphyxia: a condition caused by lack of oxygen and excess carbon dioxide in the blood. Hydrocarbon: a compound made of hydrogen and carbon only.
Teacher's Note: Write a short, clear answer.
C. Exercise
(i) The valency of carbon is (a) 1 (b) 2 (c) 3 (d) 4
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Answer: (d) 4.
Teacher's Note: Remember this for your exam.
(ii) The hardest allotrope: (a) diamond (b) graphite (c) coke (d) gas carbon
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Answer: (a) Diamond.
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(iii) Graphite heated at 700 degrees with oxygen gives (a) carbon dioxide (b) carbon monoxide (c) carbonyl chloride (d) none
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Answer: (a) Carbon dioxide.
Teacher's Note: Use the key term in your answer.
(iv) Wood charcoal is used (a) in gas masks (b) as pesticide (c) in jewellery (d) in cutting diamonds
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Answer: (a) In gas masks.
Teacher's Note: Give an example if the question allows.
(v) Carbon-rich compounds on burning produce (a) lampblack (b) petrol (c) oxygen (d) none
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Answer: (a) Lampblack.
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(vi) Carbon monoxide reduces the ____ carrying capacity of blood.
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Answer: (c) Oxygen.
Teacher's Note: Remember this for your exam.
20. Fill in the blanks: 1. The allotrope used for cutting glass is ____. 2. The soft crystalline form is ____. 3. Lampblack, charcoal and coal are ____ forms. 4. Charcoal is a good ____ agent. 5. Carbon dioxide turns ____ milky. 6. ____ is caused by lack of oxygen and excess carbon dioxide in blood.
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Answer: 1. diamond; 2. graphite; 3. amorphous; 4. adsorbing; 5. limewater; 6. Asphyxia.
Teacher's Note: Learn this point and write it in your own words.
21. Match: 1. Diamond, graphite 2. Asphyxia 3. Charcoal, soot 4. Fullerene with a. carbon monoxide poisoning b. amorphous carbon c. extreme heating of graphite d. crystalline carbon.
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Answer: 1-d; 2-a; 3-b; 4-c.
Teacher's Note: Use the key term in your answer.
22. One or two words: 1. An element present in all living things. 2. The hardest substance used in jewellery. 3. A gas that turns limewater milky. 4. A clean fuel. 5. A poisonous gas in vehicle exhaust.
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Answer: 1. Carbon; 2. Diamond; 3. Carbon dioxide; 4. LPG (or CNG); 5. Carbon monoxide.
Teacher's Note: Give an example if the question allows.
1. What is allotropy? Write the important allotropes.
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Answer: Allotropy is the existence of an element in different physical forms. Carbon has diamond, graphite and fullerenes, and the amorphous forms charcoal, coke and lampblack.
Teacher's Note: Write a short, clear answer.
2. Uses of charcoal.
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Answer: As fuel, in gas masks, for removing colour and smell, in water filters and in drawing.
Teacher's Note: Remember this for your exam.
3. Why coke, not coal, to make iron?
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Answer: Coke is almost pure carbon, burns with a high heat and no smoke, and it is a good reducing agent; coal has impurities and gives off smoke.
Teacher's Note: Learn this point and write it in your own words.
4. Why is diamond rarer than graphite?
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Answer: Diamond forms only under extremely high pressure and temperature deep in the earth, so it is found in few places; graphite forms easily and is more plentiful.
Teacher's Note: Use the key term in your answer.
5. Preparation of carbon dioxide in the lab.
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Answer: Put marble chips (calcium carbonate) in a flask and add dilute hydrochloric acid through a thistle funnel. CO2 gas is released, collected by the upward displacement of air, and it turns limewater milky. CaCO3 + 2HCl gives CaCl2 + H2O + CO2.
Teacher's Note: Give an example if the question allows.
6. Conditions of burning that lead to carbon monoxide.
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Answer: When carbon-containing fuels burn in a limited supply of air or oxygen, incomplete combustion occurs and carbon monoxide is formed.
Teacher's Note: Write a short, clear answer.
7. Four uses of carbon monoxide. 8. Why is it poisonous?
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Answer: It is used as a fuel (in water gas and producer gas), as a reducing agent in extracting metals, in making methanol and in chemical industry. It is poisonous because it combines with haemoglobin and prevents oxygen transport, causing suffocation and death.
Teacher's Note: Remember this for your exam.
9. Explain: (a) CO is a reducing agent. (b) Harmful effects of burning traditional fuels. (c) Government initiative for LPG.
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Answer: (a) CO removes oxygen from metal oxides, for example Fe2O3 + 3CO gives 2Fe + 3CO2. (b) Burning wood and dung cakes produces smoke with carbon monoxide that harms the lungs and eyes and pollutes the air, and cuts down trees. (c) The Pradhan Mantri Ujjwala Yojana gives free LPG connections to poor rural households, so that they can cook with clean fuel.
Teacher's Note: Learn this point and write it in your own words.
Free study material for Science
CBSE Class 8 Science Worksheets for Carbon and its Compounds
Practice Exercises for Class 8 Science Carbon and its Compounds
Access structured practice worksheets for Carbon and its Compounds aligned with the 2026 CBSE curriculum. These downloadable exercises for Class 8 Science help students build accuracy and reinforce core concepts for upcoming school tests.
Step-by-Step Solutions and Practice Guidelines
Built using official NCERT guidelines for Class 8 Science, these practice sheets provide reliable academic support. Cross-reference your completed work with our detailed solutions to learn standard answer-writing formats for CBSE exams.
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