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1. The term molecule means
A. Group of atoms held together
B. Single atom
C. Subatomic particle
D. Ion
2. The smallest particle showing properties of a substance is
A. Atom
B. Molecule
C. Ion
D. Electron
3. Oxygen molecule contains
A. 1 atom
B. 2 atoms
C. 3 atoms
D. 4 atoms
4. Ozone molecule has
A. 1 atom
B. 2 atoms
C. 3 atoms
D. 4 atoms
5. The atomicity of phosphorus is
A. 1
B. 2
C. 3
D. 4
6. The atomicity of sulphur is
A. 2
B. 4
C. 6
D. 8
7. The ratio of masses of hydrogen and oxygen in water is
A. 1:8
B. 1:2
C. 2:1
D. 3:8
8. A positively charged ion is called
A. Anion
B. Cation
C. Molecule
D. Isotope
9. Negatively charged ions are called
A. Cations
B. Isobars
C. Anions
D. Molecules
10. Na⁺ ion is known as
A. Sodium cation
B. Sodium anion
C. Chloride ion
D. Neutral atom
11. Cl⁻ ion is
A. Cation
B. Neutral atom
C. Anion
D. Radical
12. Valency of oxygen is
A. 1
B. 2
C. 3
D. 4
13. The valency of nitrogen in ammonia (NH₃) is
A. 1
B. 2
C. 3
D. 4
14. The chemical formula for hydrogen chloride is
A. H₂Cl
B. HCl₂
C. HCl
D. ClH₂
15. The formula of hydrogen sulphide is
A. HS
B. H₂S
C. S₂H
D. HS₂
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