Class 6 Chemistry Solved Model Papers: ICSE Class 6 Chemistry Sample Paper with Solutions Set 03
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Question 1
Choose the correct answer out of the four available choices given under each question. [15]
1. Organic chemistry is the study of _______ compounds. [1 Mark]
(a) Oxygen
(b) Sulphur
(c) Carbon
(d) Nitrogen
Answer: (C) Carbon
Organic chemistry primarily deals with the study of carbon and its compounds.
Teacher's Note:
a) Organic compounds always contain carbon atoms bonded with hydrogen, oxygen, nitrogen, or other elements.
b) Students often confuse organic chemistry with inorganic chemistry, which studies all other elements and compounds.
2. Who discovered the modern periodic table? [1 Mark]
(a) Henry Cavendish
(b) Car Scheele
(c) Van Helmont
(d) Moseley
Answer: (D) Moseley
Henry Moseley arranged elements by atomic number to create the modern periodic table.
Teacher's Note:
a) Dmitri Mendeleev created the original periodic table based on atomic mass, but Moseley discovered the modern version based on atomic number.
b) Remember that Moseley's law relates X-ray spectra frequencies to atomic numbers.
3. Which of the following is the property of gas? [1 Mark]
(a) Definite volume, no definite shape, highly compressible, least rigid
(b) No definite volume, no definite shape, highly compressible, least rigid
(c) Definite volume, definite shape, highly compressible, least rigid
(d) Definite volume, no definite shape, highly compressible, highly rigid
Answer: (B) No definite volume, no definite shape, highly compressible, least rigid
Gases expand to fill any container, possessing neither a fixed volume nor a fixed shape.
Teacher's Note:
a) Unlike liquids and solids, gases have large intermolecular spaces leading to high compressibility.
b) Read all options carefully, as slight variations in volume and shape descriptions are common traps.
4. The process of conversion of a gas into a liquid is called_______. [1 Mark]
(a) Melting
(b) Vaporisation
(c) Condensation
(d) Freezing
Answer: (C) Condensation
Condensation occurs when gas particles lose energy and turn back into liquid.
Teacher's Note:
a) Condensation is the reverse process of vaporization.
b) Ensure students do not mix up condensation with freezing, which is liquid to solid.
5. The following diagram shows the structure of an atom. The marked part consists of _________. [1 Mark]
(a) Electrons and neutrons
(b) Protons and neutrons
(c) Protons and electrons
(d) Protons
[Figure: Bohr model of an atom showing concentric electron shells with electrons orbiting a central nucleus containing red and grey spheres, with an arrow pointing directly to the dense central cluster of spheres representing protons and neutrons]
Answer: (B) Protons and neutrons
The arrow points to the nucleus, which contains protons and neutrons.
Teacher's Note:
a) The nucleus houses the nucleons, which are protons and neutrons combined.
b) Electrons revolve around the nucleus in fixed shells or orbits and are not part of the nucleus.
6. __________ is the representation of a substance by symbols. [1 Mark]
(a) Chemical formula
(b) Chemical structure
(c) Chemical equation
(d) Chemical reaction
Answer: (A) Chemical formula
A chemical formula uses element symbols and numbers to represent the composition of a substance.
Teacher's Note:
a) A chemical formula provides quick insight into the type and number of atoms in a molecule.
b) Do not confuse a chemical formula with a chemical equation, which represents an entire chemical reaction.
7. Which method is based on the difference in weights of the solid particles? [1 Mark]
(a) Sieving
(b) Winnowing
(c) Filtration
(d) Handpicking
Answer: (B) Winnowing
Winnowing uses wind or blowing air to separate heavier and lighter components of a mixture.
Teacher's Note:
a) Winnowing is commonly used by farmers to separate lighter chaff from heavier grain seeds.
b) Sieving relies on differences in particle size, whereas winnowing relies on weight differences.
8. Kerosene can be separated from water using a _________. [1 Mark]
(a) Separating funnel
(b) Filter paper
(c) Sieve
(d) Centrifuge
Answer: (A) Separating funnel
Kerosene and water form an immiscible liquid-liquid mixture that separates into distinct layers.
Teacher's Note:
a) Immiscible liquids separate based on differences in their densities using a separating funnel.
b) Water forms the lower layer due to higher density, while kerosene forms the upper layer.
9. The gas whose percentage is maximum in air is [1 Mark]
(a) Oxygen
(b) Nitrogen
(c) Carbob dioxide
(d) Water vapours
Answer: (B) Nitrogen
Nitrogen makes up approximately 78 percent of Earth's atmosphere.
Teacher's Note:
a) Oxygen is the second most abundant gas at about 21 percent.
b) Note the typographical error in option (c) printed as Carbob dioxide, which stands for carbon dioxide.
10. In solution molecules of the dissolved solid are [1 Mark]
(a) Solute
(b) Solvent
(c) Filtrate
(d) Sediment
Answer: (A) Solute
The solid substance that dissolves in a liquid to form a solution is called the solute.
Teacher's Note:
a) The medium in which the solute dissolves is called the solvent.
b) Solute plus solvent together make a homogeneous solution.
11. What is the percentage of nitrogen in air? [1 Mark]
(a) 0.02-0.03
(b) 21%
(c) 78-79%
(d) Variable
Answer: (C) 78-79%
Nitrogen constitutes nearly 78 to 79 percent of atmospheric air.
Teacher's Note:
a) This is a direct factual question reinforcing atmospheric composition.
b) Option (a) represents carbon dioxide levels, and option (b) represents oxygen levels.
12. Which gas is taken in during photosynthesis? [1 Mark]
(a) Oxygen
(b) Carbon dioxide
(c) Sulphur dioxide
(d) Nitrogen dioxide
Answer: (B) Carbon dioxide
Green plants absorb carbon dioxide from the air to synthesize food during photosynthesis.
Teacher's Note:
a) Oxygen is released as a byproduct during this process.
b) Photosynthesis requires sunlight, chlorophyll, water, and carbon dioxide.
13. The density of water is maximum at [1 Mark]
(a) 0°C
(b) 4°C
(c) 100°C
(d) 25°C
Answer: (B) 4°C
Water exhibits anomalous expansion, reaching its maximum density at 4 degrees Celsius.
Teacher's Note:
a) At 4°C, a given mass of water occupies the minimum volume, resulting in maximum density.
b) This unique property helps aquatic life survive under frozen lakes during winter.
14. _________ is used to obtain the purest form of water. [1 Mark]
(a) Filtration
(b) Boiling
(c) Condensation
(d) Distillation
Answer: (D) Distillation
Distillation involves vaporizing water and condensing the steam to remove all dissolved impurities.
Teacher's Note:
a) Filtration only removes suspended insoluble impurities, not dissolved salts.
b) Distilled water is considered chemically pure.
15. The product of photosynthesis is [1 Mark]
(a) Nitrogen
(b) Hydrogen
(c) Carbon dioxide
(d) Oxygen
Answer: (D) Oxygen
Oxygen is released into the atmosphere as a vital byproduct of plant photosynthesis.
Teacher's Note:
a) Glucose is the primary organic food product, while oxygen is the gaseous byproduct.
b) Students must remember both glucose and oxygen are products, but oxygen is listed among the choices.
Question 2
(A) Give a scientific word for the following: [5]
1. A subject which deals with the different forms of energy. [1 Mark]
Answer: Physics.
Teacher's Note:
a) Physics is the branch of science concerned with the nature and properties of matter and energy.
b) Ensure correct spelling of scientific terms.
2. Elements which show the property of metals and non-metals. [1 Mark]
Answer: Metalloids.
Teacher's Note:
a) Metalloids are semi-metals possessing intermediate properties.
b) Examples include silicon, germanium, and arsenic.
3. A method of separation based on the difference in the solubility of solid in a liquid. [1 Mark]
Answer: Crystallisation.
Teacher's Note:
a) Crystallisation separates pure solid crystals from a saturated solution.
b) It exploits temperature-dependent solubility differences.
4. The process by which plants make their food [1 Mark]
Answer: Photosynthesis.
Teacher's Note:
a) Photosynthesis literally means synthesis using light.
b) Essential components include sunlight, water, carbon dioxide, and chlorophyll.
5. A solution which cannot dissolve more of a solute at a given temperature. [1 Mark]
Answer: Saturated solution.
Teacher's Note:
a) A saturated solution holds the maximum possible amount of dissolved solute at that temperature.
b) Adding more solute results in undissolved particles settling at the bottom.
(B) Fill in the blanks and rewrite the sentences: [5]
1. Sedimentation is followed by _______. [1 Mark]
Answer: Sedimentation is followed by decantation.
Teacher's Note:
a) Sedimentation allows heavy insoluble particles to settle down, after which the clear liquid is poured out via decantation.
b) Students must write the complete sentence as instructed.
2. Matter has ___________ and occupies_________. [1 Mark]
Answer: Matter has mass and occupies space.
Teacher's Note:
a) This is the universal definition of matter.
b) Both blanks must be filled accurately to secure full credit.
3. ______ is used in observation balloons. [1 Mark]
Answer: Helium is used in observation balloons.
Teacher's Note:
a) Helium is a light, non-flammable noble gas ideal for meteorological and observation balloons.
b) Hydrogen is lighter but dangerously flammable, hence helium is preferred.
4. Chemical formula for calcium chloride is _______. [1 Mark]
Answer: Chemical formula for calcium chloride is CaCl2.
Teacher's Note:
a) Calcium has a valency of 2 and chlorine has a valency of 1, resulting in CaCl2.
b) Ensure proper subscript formatting in chemical formulas.
5. A __________ is a calibrated glass tube with openings at both the ends. [1 Mark]
Answer: A pipette is a calibrated glass tube with openings at both the ends.
Teacher's Note:
a) Pipettes are standard laboratory apparatus used to measure and transfer precise volumes of liquids.
b) Distinguish between a pipette, burette, and measuring cylinder.
Question 3
(A) Match the item in Column A with the appropriate item in Column B. [5]
| Column A | Column B |
|---|---|
| 1. Killing germs | c) Chlorine |
| 2. Obtaining pure water | b) Distillation |
| 3. Mendeleev | c) Periodic table |
| 4. Luster | e) Metals |
| 5. Marie Curie | d) Radioactivity |
Answer:
1. Killing germs - c) Chlorine
2. Obtaining pure water - b) Distillation
3. Mendeleev - c) Periodic table (Note: Column B option c appears twice in the paper key, representing Periodic table here and Chlorine in item 1; matching based on scientific pairing)
4. Luster - e) Metals
5. Marie Curie - d) Radioactivity
Teacher's Note:
a) Match items logically based on fundamental scientific concepts.
b) Note that the official key lists chlorine as 'c' and periodic table as 'c' due to a printing overlap; students should match correctly by name.
(B) Study the diagram below and answer the questions which follow: [5]
[Figure: Setup of a china dish placed on a tripod stand with a burner underneath, covered upside down by a glass funnel whose stem is plugged with cotton, showing vapours rising and solid particles condensing on the inner walls]
1. Which method of separation of mixtures is shown in the figure above? [2 Marks]
Answer: The figure shows sublimation. It is a process of separation of mixtures based on the difference between the sublimable and non-sublimable nature of solids.
Teacher's Note:
a) Sublimation directly converts a solid into gas without passing through the liquid state.
b) Examples of sublimable substances include ammonium chloride, iodine, and camphor.
2. What particles are numbered 1 and what particles are numbered 2? [3 Marks]
Answer: The particles numbered 1 are sublimable solids, and the particles numbered 2 are non-sublimable solids.
Teacher's Note:
a) Label 1 points to the upper inverted funnel where sublimed vapours condense back into solid crystals.
b) Label 2 points to the mixture in the china dish where non-sublimable residue remains behind.
Question 4
(A) State a method to separate the following mixtures: [5]
1. Separating stone particles from wheat grains [1 Mark]
Answer: Handpicking.
Teacher's Note:
a) Handpicking is suitable when impurities are present in small quantities and differ in size, shape, or color.
b) It is a manual separation technique.
2. Separating heterogeneous solid-liquid mixtures [1 Mark]
Answer: Decantation (or Filtration).
Teacher's Note:
a) Decantation involves pouring out clear liquid after sedimentation.
b) Filtration uses a filter paper to retain insoluble solids.
3. Separating saw dust from water [1 Mark]
Answer: Filtration.
Teacher's Note:
a) Saw dust is insoluble in water and floats or remains suspended.
b) Passing the mixture through filter paper traps sawdust particles.
4. Separating liquid-liquid immiscible mixtures [1 Mark]
Answer: Separating funnel.
Teacher's Note:
a) Immiscible liquids form distinct layers based on density differences.
b) Opening the stopcock of a separating funnel allows the lower layer to drain out.
5. Separating RBCs from blood [1 Mark]
Answer: Centrifugation.
Teacher's Note:
a) Centrifugation spins mixtures rapidly to separate components based on density.
b) Heavier red blood cells settle at the bottom during this process.
(B) Define the following: [5]
1. Element [1 Mark]
Answer: An element is a pure substance and is made of one kind of atoms. Examples: Sulphur, Hydrogen, Oxygen.
Teacher's Note:
a) Elements cannot be broken down into simpler substances by chemical reactions.
b) Mentioning examples adds clarity and secures full marks.
2. Condensation [1 Mark]
Answer: The process in which a gas is converted into the liquid form is called condensation.
Teacher's Note:
a) Condensation is an exothermic phase transition.
b) It occurs when temperature drops or pressure increases.
3. Heterogeneous mixture [1 Mark]
Answer: A mixture in which the components or constituents are not uniformly distributed throughout its volume is called a heterogeneous mixture.
Teacher's Note:
a) Different parts of the mixture have different compositions.
b) Examples include oil and water, or sand and water.
4. Boiling point [1 Mark]
Answer: The boiling point is the temperature at which a liquid starts boiling. The boiling point of water is 100°C.
Teacher's Note:
a) At this temperature, vapor pressure equals atmospheric pressure.
b) State the exact reference value for water.
5. Vaporisation [1 Mark]
Answer: The process in which a liquid is converted into the gaseous form is called vaporisation.
Teacher's Note:
a) Vaporisation includes both evaporation at the surface and boiling throughout the liquid.
b) It requires absorption of latent heat.
Question 5
(A) Give the chemical formulae for the following: [5]
1. Potassium hydroxide [1 Mark]
Answer: KOH
Teacher's Note:
a) Potassium has a valency of 1 and hydroxide has a valency of 1, combining to form KOH.
b) Ensure correct capitalization of chemical symbols.
2. Calcium chloride [1 Mark]
Answer: CaCl2
Teacher's Note:
a) Calcium exhibits a valency of 2.
b) Chlorine exhibits a valency of 1, yielding CaCl2.
3. Aluminium hydroxide [1 Mark]
Answer: Al(OH)3
Teacher's Note:
a) Aluminium has a valency of 3.
b) Hydroxide has a valency of 1, requiring parentheses around OH with a subscript of 3.
4. Sodium chloride [1 Mark]
Answer: NaCl
Teacher's Note:
a) Sodium chloride is common table salt.
b) Formed by combining sodium (Na+) and chloride (Cl-) ions in a 1:1 ratio.
5. Sulphuric acid [1 Mark]
Answer: H2SO4
Teacher's Note:
a) Sulphuric acid is a strong mineral acid containing two hydrogen atoms, one sulfur atom, and four oxygen atoms.
b) Often referred to as the king of chemicals.
(B) Give one example of the following: [5]
1. Liquid-liquid mixture [1 Mark]
Answer: Lemon juice and water.
Teacher's Note:
a) Miscible liquid mixtures form a single uniform phase.
b) Other examples include alcohol and water.
2. Major branches of science [1 Mark]
Answer: Physics, Chemistry and Biology.
Teacher's Note:
a) Natural science is broadly divided into these three core pillars.
b) Listing all three provides a complete and accurate answer.
3. Separation by centrifugation [1 Mark]
Answer: Cream from milk.
Teacher's Note:
a) Centrifugation forces denser components outward while lighter components stay centered.
b) This is how butter is churned from milk in dairies.
4. Mixture of solid in liquid [1 Mark]
Answer: Sea water.
Teacher's Note:
a) Sea water contains dissolved salts (solids) in water (liquid).
b) Sand in water is another valid heterogeneous solid-liquid mixture example.
5. Separation by filtration [1 Mark]
Answer: Separation of tea leaves from the liquid.
Teacher's Note:
a) Filtration traps insoluble solid residues on the filter medium.
b) The clear liquid passing through is called the filtrate.
Question 6
(A) State whether True or False: [5]
1. Metallic elements are non-ductile. [1 Mark]
Answer: False. Metallic elements are ductile.
Teacher's Note:
a) Ductility is a primary physical property of metals allowing them to be drawn into thin wires.
b) Non-metals are generally non-ductile.
2. Solidification is the same as condensation. [1 Mark]
Answer: False. Solidification is not the same as condensation.
Teacher's Note:
a) Solidification is liquid turning to solid, whereas condensation is gas turning to liquid.
b) Both are phase changes releasing heat, but involve different states of matter.
3. In zinc oxide, the valency of zinc is two. [1 Mark]
Answer: True.
Teacher's Note:
a) Zinc exhibits a fixed valency of 2 in its compounds like ZnO.
b) Oxygen also has a valency of 2, forming a 1:1 atomic ratio.
4. During sublimation, solid changes into liquid. [1 Mark]
Answer: False. During sublimation, solid changes into vapour.
Teacher's Note:
a) Sublimation skips the liquid phase entirely.
b) Solids convert directly to gas and vice versa during deposition.
5. Distillation is a process of separating a heterogeneous liquid-liquid mixture. [1 Mark]
Answer: False. Distillation is a process of separating a homogeneous liquid-liquid mixture.
Teacher's Note:
a) Distillation separates miscible (homogeneous) liquids based on boiling point differences.
b) Immiscible (heterogeneous) liquids are separated using a separating funnel.
(B) Name the following apparatus used in a chemistry laboratory. [5]
[Figure: Table containing five apparatus line drawings: 1. A long narrow graduated glass tube with a tapered tip and suction mark at top. 2. A long graduated glass tube with a stopcock valve in the middle and a narrow tip. 3. Two open-ended cylindrical glass test tubes standing vertically. 4. A wide cylindrical graduated glass beaker with a pouring spout. 5. A long-stemmed glass funnel with a spherical bulbous reservoir near the top.]
| Apparatus | Name |
|---|---|
| [Figure: Pipette] | Pipette |
| [Figure: Burette] | Burette |
| [Figure: Test tubes] | Test tubes |
| [Figure: Beaker] | Beaker |
| [Figure: Thistle funnel] | Thistle funnel |
Answer:
1. Pipette
2. Burette
3. Test tubes
4. Beaker
5. Thistle funnel
Teacher's Note:
a) Students must correctly identify standard laboratory glassware by sight.
b) Note the stopcock on the burette and the bulbous reservoir on the thistle funnel as key identifying features.
Question 7
1. Distinguish between solids, liquids and gases. [4 Marks]
Answer:
| Solids | Liquids | Gases |
|---|---|---|
| - Solids have definite shape and volume. | - Liquids have definite volume but no definite shape. | - Gases have no definite shape or definite volume. |
| - Solids cannot be compressed. | - Liquids can be slightly compressed. | - Gases can be highly compressed. |
| - Solids are highly rigid. | - Liquids are less rigid. | - Gases are least rigid. |
| - Solids cannot diffuse. | - Liquids show diffusion. | - Gases can easily diffuse. |
| - The space between the atoms in a solid is minimum. | - The space between the atoms is more than that of solids and less than that of gases. | - The space between the atoms in a gas is maximum. |
Teacher's Note:
a) Comparisons should cover shape, volume, compressibility, rigidity, diffusion, and intermolecular space.
b) Tabular presentation is best for distinction questions.
2. Distinguish between element, compound and mixture. [3 Marks]
Answer:
| Element | Compound | Mixture |
|---|---|---|
| - An element is made of one kind of atoms. | - A compound is made of two or more kinds of atoms. | - A mixture is made of two or more elements or compounds. |
| - It cannot be broken down into simpler substances by any physical or chemical method. | - It can be broken down into simpler substances by chemical methods. | - It can be separated by physical methods. |
| - Elements have their own set of properties. | - The properties of a compound differ from those of their elements. | - Mixtures have no definite set of properties. |
Teacher's Note:
a) Focus on composition, separation methods, and property retention when comparing these chemical categories.
b) Ensure clear alignment across rows and columns.
3. Distinguish between metals and non-metals. [3 Marks]
Answer:
| Metals | Non-metals |
|---|---|
| - Metals have lustre. | - Non-metals do not have lustre. |
| - Metals are malleable and can be beaten into sheets. | - Non-metals are non-malleable and cannot be beaten into sheets. |
| - Metals are ductile and can be drawn into wires. | - Non-metals are non-ductile and cannot be drawn into wires. |
| - Metals are good conductors of heat and electricity. | - Non-metals are poor conductors of heat and electricity. |
Teacher's Note:
a) Highlight physical properties like malleability, ductility, conductivity, and appearance.
b) Contrast each metal property directly with its corresponding non-metal property.
Free study material for Chemistry
ICSE Class 6 Chemistry Sample Paper with Solutions Set 03 & Sample Question Papers for Class 6 Chemistry
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