CBSE Class 9 Science Atoms and Molecules Quiz 1

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CBSE › Class 9 › Science › Atoms and Molecules

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1. The chemical symbol for nitrogen gas is

A Ni B N C N D N

2. The chemical symbol for sodium is

A So B Sd C NA D Na

3. Which of the following would weigh the highest?

A 0. 2 mole of sucrose (C B 2 moles of CO C 2 moles of CaCO D 10 moles of H

4. Which of the following has maximum number of atoms?

A 18 g of H B 18 g of O C 18 g of CO D 18 g of CO

5. Which of the following correctly represents 360 g of water?

A (i) B (i) and (iv) C (ii) and (iii) D (ii) and (iv)

6. 3. 42 g of sucrose are dissolved in 18 g of water in a beaker. The number of oxygen atoms in the solution are

A 6. 68 × 10 B 6. 09 × 10 C 6. 022 × 10 D 6. 022 × 10

7. A change in the physical state can be brought about

A only when energy is given to the system B only when energy is taken out from the system C when energy is either given to, or taken out from the system D without any energy change

8. The relative molecular mass of Na₂S₂O₃.5H₂O is

A 250 amu B 250 g C 248 amu D 248 g

9. 5H

A 250 amu B 250 g C 248 amu D 248 g

10. Which of the following has maximum number of atom?

A 18 g H B 18 g of O C 18 g of CO D 18 g of CH

Practice more on Atoms and Molecules

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