Willer Academy: Chemistry Test #3 – Atoms & Molecules

Chapter: Class 9 – NCERT Chapter 3 | NEET Foundation

Instructions:
✔ 10 MCQs | +4 for Correct | –1 for Incorrect | 0 for Unattempted
✔ Submit to see your score and topic-wise feedback.

1. Who gave the law of conservation of mass?
a) Dalton b) Lavoisier c) Rutherford d) Boyle

2. The SI unit of atomic mass is:
a) g b) kg c) amu d) mole

3. The number of atoms in one molecule of ozone (O₃) is:
a) 1 b) 2 c) 3 d) 4

4. H₂O contains hydrogen and oxygen in what ratio by mass?
a) 2:16 b) 1:2 c) 8:1 d) 1:8

5. Mole is defined as:
a) 6.022 × 10²² atoms b) 6 atoms c) Group of molecules d) 6.022 × 10²³ particles

6. One molecule of nitrogen (N₂) contains how many atoms?
a) 2 b) 4 c) 1 d) 3

7. Valency of calcium is:
a) 1 b) 2 c) 3 d) 4

8. CO₂ (Carbon Dioxide) is composed of:
a) One carbon, two oxygen b) Two carbon, one oxygen c) One carbon, one oxygen d) Two carbon, two oxygen

9. Which is a triatomic molecule?
a) HCl b) O₃ c) Ne d) H₂

10. Chemical formula of ammonium chloride is:
a) NH₄Cl b) NaCl c) CaCl₂ d) NH₃

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