Mole Concept MCQs Quiz Multiple Choice Questions & Answers

1. Which one of the following statements is incorect ?

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

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

1. 1g
2. 6.02 × 10²² molecules
3. 0.01 mol
4. 1 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. 11g
2. 22g
3. 33g
4. 5.5 g

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

1. CO
2. B₂H₆
3. N₂O
4. N₂

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

1. CO
2. B₂H₆
3. N₂
4. N₂0

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

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

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

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

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

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

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. 2.5
2. 10
3. 20
4. 5

10. 5.0 litre of 0.4 M H₂SO₄ Contains

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

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. 44
2. 88
3. 32
4. 22

12. 5.6 litres of oxygen at NTP is equivalent of

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

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

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

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

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

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

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

16. Atomic mass of an elements is

1. the relative mass of an atom of the element
2. the average relative mass of different atoms of the element
3. much different from the mass number of the element.
4. the actual mass of one atom of the element

17. Avogadros number represents the number of atoms in

1. 320g of sulphur
2. 32g of oxygen
3. 12.7g of iodine
4. 12g of C¹²

18. How many grams are contained in 1 gram-atom of Na?

1. 23g
2. 1 g
3. 1/23g
4. 13g

19. I mole of a compuund contain 1 mole of C and 2 moles of O. The molecular weight of the compound is

1. 12
2. 32
3. 44
4. 3

20. Mass of a mole of electrons is

1. 0.02mg
2. 0.55mg
3. 1.00mg
4. 0.20mg

21. Number of atoms of oxygen present in 10.6g Na₂Co₃ will be

1. 12.04 × 10²²
2. 1.806 × 10²³
3. 31.80 × 10²³
4. 6.02 × 10²²

22. Number of electrons in 1.8 mL of H₂O is

1. 3.011 x 10²³
2. 0.6022 x 10²³
3. 60.22 x 10²³
4. 6.02 x 10²³

23. Number of water molecules in the drop of water,if 1 ml of water has 20 drops and A is Avogadros number, is

1. 0.05A (C)0.5A
2. 0.05A/18
3. 0.5A/18

24. One mole of oxygen gas is the volume of

1. 32 litres of oxygen at S.T.P.
2. 22.4 litres of oxygen at S.T.P.
3. 6.02 × 10²³ molecules of oxygen at any temperature and pressure.
4. 1 litre of oxygen at S.T.P.

25. The mass of carbon present in 0.5 mole of K₄ [Fe(CN)₆] is

1. 18 g
2. 3.6 g
3. 36 g
4. 1.8 g

26. The maximum no. of molecules is present in

1. 5 L of N₂ gas at S.T.P
2. 0.5 g of H₂ gas
3. 10 g of O₂ gas
4. 15 L of H₂ gas at S.T.P

27. The number of g-atom of oxygen in 6.02 × 10²⁴ CO molecules is

1. 0.5
2. 5
3. 10
4. 1

28. The number of moles of carbon dioxide which contain 8 g of oxygen is

1. 0.20 mol
2. 0.40 mol
3. 0.25 mol
4. 0.5 mol

29. The total no of ions present in 111 g of cacl₂ is

1. Two mole
2. Three mole
3. Four moles
4. One mole

30. The weight of 350 mL of diatomic gas at 0 degree Centigrate and 2 atm pressure is 1g. The wt. of one atom is

1. 32/N
2. 16 N
3. 32 N (N is the Av. const.)
4. 16/N

31. Volume at N.T.P of 0.22 g of CO₂ is same as that of

1. 0.085 g of NH₃
2. 320 mg of gaseous So₂
3. All the above.
4. 0.01 g of hydrogen

32. Volume at N.T.P. of 0.22 g of CO₂ is same as that of

1. 0.085 g of NH₃
2. 320 mg of gaseous So₂
3. All the the above
4. 0.01 g of hydrogen

33. Which among the following is the heaviest?

1. One molecule of sulphur trioxide
2. 100 amu of uranium
3. 44 g of carbon dioxide.
4. One mole is oxygen

34. Which has maximum number of atoms ?

1. 56g of Fe (56)
2. 27g of Al (27)
3. 108g of Ag (108)
4. 24g of c (12)

35. Which of the following contains maximum no. of molecules ?

1. 150 cc of N₃ at S.T.P
2. 50 cc of So₂ at S.T.P
3. 150 cc of O₂ at S.T.P
4. 200 cc of NH₃ at S.T.P

36. Which of the following weighs the most ?

1. One mole of water
2. One mole of sodium
3. One molecule of H2So4
4. one g-atom of nitrogen

37. Which sample contains the largest number of atoms?

1. 1 mg of N₂
2. 1 mg of Na
3. 1 mL of water
4. 1 mg of C₄H₁₀