ICSE Class 6 Chemistry - Pure Substances and Mixtures - Test 2 (Intermediate)
1. Distilled water is considered a pure substance because it contains:
A. Many visible substances
B. Mud and salt
C. Only water particles
2. When rice and pulses are mixed in a bowl, they form a mixture because:
A. No new substance is formed
B. They become a compound
C. They lose all properties
3. A glass of salt solution looks the same from top to bottom. It is a:
A. Heterogeneous mixture
B. Homogeneous mixture
C. Pure element
4. Sand added to water forms a heterogeneous mixture because:
A. Sand becomes a gas
B. Water becomes pure gold
C. Sand particles can be seen separately
5. Which method is suitable to separate sand from water?
A. Filtration
B. Magnetism
C. Freezing only
6. Which method can be used to get salt from salt water?
A. Handpicking
B. Evaporation
C. Sieving stones
7. Which method can separate small stones from rice?
A. Evaporation
B. Condensation
C. Handpicking
8. Which method is used to separate flour from larger bran particles?
A. Sieving
B. Melting
C. Burning
9. A mixture of iron filings and sulphur powder can be partly separated using:
A. A glass rod
B. A magnet
C. A thermometer
10. Which statement is true for most mixtures?
A. Their components cannot ever be separated
B. They always have a fixed formula
C. Their components can often be separated
11. Which one is a pure substance?
A. Oxygen
B. Sea water
C. Fruit salad
12. Lemon juice with sugar is classified as a:
A. Pure compound only
B. Mixture
C. Pure element
13. Why is pure sugar considered a pure substance?
A. It is always mixed with sand
B. It has visible different parts
C. It has a fixed composition
14. Which statement is correct about the composition of a mixture?
A. It can vary
B. It is always fixed like a compound
C. It must contain only one substance
15. A cup of tea is a mixture because it contains:
A. Only one element
B. Different substances mixed together
C. Only pure oxygen
16. Which property belongs to a pure substance?
A. It always has visible layers
B. It is made by random mixing only
C. It has the same composition throughout
17. Oil and water kept together form two layers. This is an example of:
A. Heterogeneous mixture
B. Pure element
C. Pure compound only
18. A solution is best described as a:
A. Substance with visible separate parts
B. Homogeneous mixture
C. Pure element only
19. In sugar solution, the substance that dissolves is:
A. Water
B. Glass
C. Sugar
20. In sugar solution, the solvent is:
A. Water
B. Sugar
C. Sand