Mole Concept MCQ Questions and Answers Quiz

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

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

22. Number of electrons in 1.8 mL of H2O is

  1. 6.02 x 1023
  2. 3.011 x 1023
  3. 0.6022 x 1023
  4. 60.22 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. 0.5A/18
  2. 0.05A (C)0.5A
  3. 0.05A/18

24. One mole of oxygen gas is the volume of

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

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

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

26. The maximum no. of molecules is present in

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

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

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

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

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

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

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

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