ICSE Class 6 Chemistry - Elements, Compounds and Symbols - Test 5 (Comprehensive)
1. Which description best matches an element?
A. A substance made by mixing many materials
B. A pure substance with one kind of atom
C. A substance that is always liquid
2. Which description best matches a compound?
A. Only one kind of atom
B. A physical mixture of substances
C. Elements chemically combined
3. Which of the following is an element?
A. Oxygen
B. Water
C. Common salt
4. Which of the following is a compound?
A. Sulphur
B. Carbon dioxide
C. Copper
5. The chemical symbol O stands for:
A. Gold
B. Iron
C. Oxygen
6. Which symbol represents carbon?
A. C
B. Ca
C. Cu
7. Which element has the symbol H?
A. Helium
B. Hydrogen
C. Mercury
8. Which is the correct symbol for nitrogen?
A. Na
B. Ni
C. N
9. The symbol Na represents:
A. Sodium
B. Sulphur
C. Silver
10. Which symbol should be used for iron?
A. I
B. Fe
C. In
11. Which is the correct symbol of copper?
A. C
B. Co
C. Cu
12. Which symbol represents gold?
A. Au
B. Ag
C. G
13. Which symbol is written correctly?
A. cA
B. Ca
C. CA
14. Which formula represents water?
A. CO2
B. NaCl
C. H2O
15. Which formula represents common salt?
A. NaCl
B. H2O
C. CO2
16. Which formula represents carbon dioxide?
A. NaCl
B. CO2
C. H2O
17. Which statement is correct?
A. A symbol always represents a mixture
B. A formula always represents only a single letter
C. A symbol represents an element and a formula represents a compound
18. Which pair is correctly matched?
A. Silver - Ag
B. Silver - Si
C. Silver - S
19. Which statement about compounds is true?
A. They always have the same properties as their elements
B. They may have different properties from their elements
C. They are always formed by simple mixing
20. Which pair contains only pure substances?
A. Air and soil
B. Salt water and muddy water
C. Oxygen and water