DPP -04

Mole Basic
1. Mass of 1 atom of Hydrogen is -
(A) 1.66 × 10–24 g (B) 10–22 g (C) 10–23 g (D) 10–25 g

2. Which of the following contains the largest number of atoms -

(A) 11g of CO2 (B) 4g of H2 (C) 5g of NH3 (D) 8g of SO2

3. Four containers of 2L capacity contains dinitrogen as described below. Which one contains maximum number
of molecules under similar conditions.
(A) 2.5 gm-molecules of N2 (B) 4 gm-atom of nitrogen
(C) 3.01 × 1024 N atoms (D) 84 gm of dinitrogen

4. What is correct for 10 g of CaCO3 -

(A) It contains 1g-atom of carbon (B) It contains 0.3 g-atoms of oxygen
(C) It contains 12 g of calcium (D) None of these

5. Which of the following has maximum mass ?

(A) 0.1 g atom of nitrogen (B) 0.1 mol of ammonia
(C) 6.02 × 1023 molecules of helium gas (D) 1120 cc of carbon dioxide

6. 4.0 g of caustic soda (mol mass 40) contains same number of sodium ions as are present in-
(A) 10.6 g of Na2CO3 (mol. mass 106) (B) 58.5 g of NaCl (Formula mass 58.5)
(C) 100 ml of 0.5 M Na2SO4 (Formula mass 142) (D) 1mol of NaNO3 (mol. mass 85)

7. One atom of an element ‘X’ weighs 6.664 × 10–23 gm. The number of gram atoms in 40 kg of it
is -
(A) 10 (B) 100 (C) 10000 (D) 1000

8. The number of oxygen atoms present in 14.6 g of magnesium bicarbonate [Mg(HCO3)2] is

(A) 6NA (B) 0.6NA (C) NA (D) 0.5 NA

9. One mole of P4 molecules contains -

(A) 1 molecule (B) 4 molecules
(C) 1/4 × 6.022 × 1023 atoms (D) 24.088 × 1023 atoms

10. The total number of protons , electrons and neutrons in 12gm of 6C12 is -
(A) 1.084 × 1025 (B) 6.022 × 1023 (C) 6.022 × 1022 (D) 18

11. The number of sodium atoms in 2 moles of sodium ferrocyanide Na4[Fe(CN)6], is-
(A) 2 (B) 6.023 × 1023 (C) 8 × 6.02 × 1023 (D) 4 × 6.02 × 1023

12. 16 gm of SOx occupies 5.6 litre at STP. Assuming ideal gas nature, the value of x is -
(A) 1 (B) 2 (C) 3 (D) None of these
13. Out of 1.0 g dioxygen, 1.0 g (atomic) oxygen and 1.0 g of ozone, the maximum number of oxygen atoms
are contained in -
(A) 1.0 g of atomic oxygen. (B) 1.0 g of ozone.
(C) 1.0 g of oxygen gas. (D) All contain same number of atoms.

14. Number of Ca+2 and Cl– ion in 111 g of anhydrous CaCl2 are -
(A) NA, 2NA (B) 2NA, NA (C) NA, NA (D) None

15. 2 moles of H2 at NTP occupy a volume of

(A) 11.2 litre (B) 44.8 litre (C) 2 litre (D) 22.4 litre

16. 4.48 litres of methane at N.T.P. correspond to-

(A) 1.2 x 1022 molecules of methane (B) 0.5 mole of methane
(C) 3.2 gm of methane (D) 0.1 mole of methane

17. The weight of a substance that displaces 22.4 litre air at NTP is -
(A) Mol. wt. (B) At. wt. (C) Eq. wt. (D) all

18. The maximum volume at N.T.P. is occupied by-

(A) 12.8 gm of SO2 (B) 6.02 x 1022 molecules of CH4
(C) 0.5 mol of NO2 (D) 1 gm-molecule of CO2

19. Equal masses of O2 , H2 and CH4 are taken in a container. The respective mole ratio of these gases in
container is -
(A) 1 : 16 : 2 (B) 16 : 1 : 2 (C) 1 : 2 : 16 (D) 16 : 2 : 1

20. Number of moles of water in 488 gm of BaCl2.2H2O are - (Ba = 137)

(A) 2 moles (B) 4 moles (C) 3 moles (D) 5 moles

21. What is not correct regarding 22 g of CO2 ?

(A) It occupies always 11.2 L of volume at STP
(B) It corresponds to 1 g molecule of carbon dioxide
(C) It contains one g-atom of oxygen
(D) It contains 0.5 g-atom of carbon

22. 1 gm - atom of nitrogen represents -

(A) 6.02 x 1023 N2 molecules (B) 22.4 lit. of N2 at N.T.P.
(C) 11.2 lit. of N2 at N.T.P. (D) 28 gm of nitrogen.

23. If 3.01 x 10 20 molecules are removed from 98 mg of H2SO4, then the number of moles of H2SO4 left are-
(A) 0.1 × 10–3 (B) 0.5 × 10–3 (C) 1.66 × 10–3 (D) 9.95 × 10–2
24. Total number of atoms of all elements present in 1 mole of ammonium dichromate [(NH4)2Cr2O7] is
(A) 14 (B) 19 (C) 6 × 1023 (D) 114 × 1023

25. Total no. of atoms in 44 gm of CO2 is -

(A) 6.02 × 1023 (B) 6.02 × 1024 (C) 1.806 × 1024 (D) 18.06 × 1022

26. If the density of water is 1 gm/cm3, then the volume occupied by one molecule of water is approximately-
(A) 18 cm3 (B) 22400 cm3 (C) 6.02 × 10–23 cm3 (D) 3.0 × 10–23 cm3

27. How many grams are contained in 1gm-atom of Na -

(A) 13 gm (B) 23 gm (C) 1 gm (D) 1/23 gm

28. 8 gm of O2 has the same number of molecules as-

(A) 7 gm of CO (B) 14 gm of CO (C) 14 gm of CO2 (D) 12 gm of CO2

29. 4.4 gm of CO2 and 2.24 litre of H2 at STP are mixed in a container. The total number of molecules present
in the container will be -
(A) 6.022 × 1023 (B) 1.2044 × 1023 (C) 2 moles (D) 6.023 × 1024

30. A sample of AlF3 contains 3.0 × 1024 F– ions. The number of formula units in this sample are -
(A) 9.0 × 1024 (B) 3.0 × 1024
(C) 0.75 × 1024 (D) 1.0 × 1024

31. Calculate the gm quantity of Na2CO3 which has same No. of atoms as the No. of protons present in 10
gm CaCO3 -
(A) 20 gm (B) 88.33 gm (C) 44 gm (D) 60 gm

32. The weight of 2.01 × 1023 molecules of CO is -

(A) 9.3 gm (B) 7.2 gm (C) 1.2 gm (D) 3 gm

33. Number of atoms in 560 gm of Fe (atomic mass 56 g mol–1) is –

(A) is twice that of 70 gm N (B) is half that of 20 gm H
(C) both are correct (D) None is correct

34. How many moles of magnesium phosphate, Mg3(PO4)2 will contain 0.25 mole of oxygen atoms ?
(A) 3.125 × 10–2 (B) 1.25 × 10–2 (C) 2.5 × 10–2 (D) 0.02

35. The weight of 1 × 1022 molecules of CuSO4.5H2O is -

(A) 41.59 g (B) 415.9 g (C) 4.159 g (D) none of the three

36. The number of atoms present in a 0.635 g of Cu piece will be:

(a) 6.023 × 10-23 (b) 6.023 × 1023 (c) 6.023 × 1022 (d) 6.023 × 1021
37. Rearrange the following (I to IV) in the order of increasing masses and choose the correct Answer from (A), (B),
(C) and (D) (At. mass : N = 14, O = 16, Cu = 63)
(I) 1 molecule of O (II) 1 atom of nitrogen
(III) 1 × 10–10 g molecular mass of oxygen (IV) 1 × 10–7 g atomic mass of copper
(A) II < I < III < IV (B) IV < III < II < I
(C) II < III < I < IV (D) III < IV < I < II

38. At 100ºC and 1 atm, if the density of liquid water is 1.0 g cm–3 and that of water vapour is 0.0006 g cm–3 , then the
volume occupied by water molecules in 1 litre of steam at that temperature is
(A) 6 cm3 (B) 60 cm3 (C) 0.6 cm3 (D) 0.06 cm3

39. How many moles of electron weigh one kilogram ?

1 6.023 1
(A) 6.023 × 1023 (B) ×1031 (C) ×1054 (D) × 108
9.108 9.108 9.108  6.023

40. The sample with largest number of atoms is :

(a) 1 g of O2(g) (b) 1 g of Ni (s) (c) 1 g of B(s) (d) 1 g of N2 (g)

41. A sample of ammonium phosphate (NH4)3 PO4 contains 6.36 mol of hydrogen atoms. The number of moles of
oxygen atom in the sample is: (atomic mass of N = 14.04, H =1, P = 31, 0=16)
(a) 0.265 (b) 0.795 (c) 2.12 (d) 4.14

42. The number of molecules in one cm3 of oxygen gas at S.T.P. is found to be 2.6875 × 1019. It is known as -
[1] Berzelius number [2] Avogadro number
[3] Gay Lussac’s number [4] Loschmidt number

43. Calculate the number of moles left after removing 1021 molecules from 200 mg of CO2 :
(a) 0.00454 (b) 0.00166 (c) 2.88 × 10-3 (d) none of these

44. Volume occupied by 1 mole of a diatomic gas at NTP will be:

(a) 67.2 L (b) 22.4 L (c) 11.2 L (d) none of these

45. Which of the following pairs contain equal number of atoms?

(a) 11.2 cc (STP) of nitrogen and 0.015 g of nitric oxide
(b) 22.4 litre (STP) of nitrous oxide and 22.4 litres of nitric oxide
(c) 1 milhimole of HC1 and 0.5 millimole of H2S
(d). 1 mole of H2O2 and 1 mole of N2O4

46. The mass of nitrogen in 1 kg of ammonium nitrate is -

(a) 700 g (b) 3.5 × 10–1 kg (c) 350 g (d) 35 g

47. Which of the following does not occupy a volume of 4.48 L at S.T.P. ?
[1] 0.2 mol of H2 [2] 12.8 g of SO2 [3] 3.2 g of O2 [4] 800 mg of He
48. Which of the following pairs contains equal number of atoms -
[1] 11.2 cc of nitrogen and 0.015 g of nitric oxide
[2] 22.4 litres of nitrous oxide and 22.4 litres of nitric oxide
[3] 1 millimole of HCl and 0.5 millimole of H2S
[4] 1 mole of H2O2 and 1 mole of N2O4

49. Which of the following statements is incorrect ?

[1] One gram atom of nitrogen contains Avogadro’s number of atoms
[2] One mole of ozone gas contains Avogadro’s number of molecules
[3] One mole of ozone contains Avogadro’s number of atoms
[4] One mole of electrons stands for 6.02 × 1023 electrons

50. One mole of nitrogen gas is the volume of -

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

ANSWER KEY
1. A 2. B 3. D 4. B 5. C 6. C 7. D 8. B
9. D 10. A 11. C 12. B 13. D 14. A 15. B 16. C
17. A 18. D 19. A 20. B 21. B 22. C 23. B 24. D
25. C 26. D 27. B 28. A 29. B 30. D 31. B 32. A
33. C 34. A 35. C 36. D 37. A 38. C 39. D 40. C
41. C 42. D 43. C 44. B 45. A 46. C 47. C 48. A
49. C 50. C