Mole Concept MCQ Questions and Answers for Practice

1. Which one of the following statements is incorect ?

1. One gram atom of carbon contains avogadros number of atoms
2. One mole of oxygen gas contains Avogadros number of atoms
3. One mole of hydrogen contains Avogadros number of atoms
4. One mole of electrons stands for 6.02x10²³ electrons

2. 0.224 L of H₂ gas at S.T.P is equivalent to

1. 1 mol
2. 1g
3. 6.02 × 10²² molecules
4. 0.01 mol

3. 100 g caco₃ is treated with I litre of 1N HCl. What would be the weight of co₂ libereted after the completion of the reaction ?

1. 5.5 g
2. 11g
3. 22g
4. 33g

4. 11.2 litre of a gas at STP weighs 14 g. The gas could not be

1. N₂
2. CO
3. B₂H₆
4. N₂O

5. 11.2 Litres of a gas at STP weighs 14g. The gas could not be

1. N₂0
2. CO
3. B₂H₆
4. N₂

6. 2 moles of H atoms at NTP occupy a volume of

1. 11.2 litres
2. 44.8 litres
3. 2 litres
4. 22.4 litres

7. 2.0 g of oxygen contains number of atoms same as in

1. 4g of s
2. 7g of nitrogen
3. 0.5 g of H₂
4. 12.3 g of Na.

8. 22.4 litres of water vapour at NTP, when condensed to water, occupies an approximate volume of

1. 18 litres
2. 1 litre
3. 1 mL
4. 18 ml

9. 5 moles of a gas in closed vessel was heated from 300 K to 600 K. the pressure of gas doubled The number of moles of the gas will be

1. 5
2. 2.5
3. 10
4. 20

10. 5.0 litre of 0.4 M H₂SO₄ Contains

1. 2.0 Mole Of H₂SO₄
2. 0.4 mole H₂SO₄
3. 5.0 mole H₂SO₄
4. 2.0 moles H₂O

11. 5.6 litres of gas at N.T.P are found to have a mass of 11 g. The molecular mass of the gas is

1. 22
2. 44
3. 88
4. 32

12. 5.6 litres of oxygen at NTP is equivalent of

1. 1 mole
2. 1/2 mole
3. 1/4 Mole
4. 1/8 mole

13. 6.02×10²² molecules of N₂ at NTP will occupy a volume of

1. 22.4 litres
2. 2.24 litres
3. 6.02 litres
4. 6.02 mL

14. A sample of phosphrous trichloride(PCl₃) contains 1 .4 moles of the substance. how many atoms are there is the sample ?

1. 5.6
2. 4
3. 8.431× 10²³
4. 3.372× 10²⁴

15. A symbol not only represents the name of the element but also represents

1. its atomic no.
2. 1 gm-atom
3. its atomicity
4. Reactivity.