1. OBJECTIVE QUESTIONS FOR NEET AIIMS JIPMER www.wisedane.com
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2. CHEMISTRY
HYDROGEN
SET 2
MCQ’S

3. Q1. Moist hydrogen cannot be dried over conc. H2SO4 because
It can catch fire
It is reduced by H2SO4
It is oxidized by H2SO4
It decomposes H2O2

4. ANSWER (C) EXPLANATION

5. Q2. Decomposition of H2O2 is favoured by
Traces of acids
Alcohol
Acetanilide
MnO

6. ANSWER (D) EXPLANATION
MnO catalyses the decomposition of H2O2.

7. Q3. Match the following and choose the correct option.
Column I
Column II
Electrolysis of water produces
Atomic reactor
B. Lithium aluminium hydride is used as
2. Recombines on metal surface to generate high temperature
C. Heavy water is used in
3. Reducing agent
D. Atomic hydrogen
4. Hydrogen and oxygen
(A)
(B)
(C)
(D)

8. ANSWER (B) EXPLANATION
A  4, B 3 , C 1, D 2

9. Q4. The O – O – H bond angle in H2O2 is

10. ANSWER (D) EXPLANATION
O – O – H bond angle in H2O2 is 97o.

11. Q5. The oxide that gives H2O2 on treatment with dilute acid is
PbO2
Na2O2
MnO2
TiO2

12. ANSWER(B) EXPLANATION

13. Q6. Acidified solution of chromic acid on treatment with H2O2 yields
CrO3 + H2O + O2
Cr2O3 + H2O + O2
CrO5 + H2O + K2SO4
H2Cr2O7 + H2O + O2

14. ANSWER (C) EXPLANATION

15. Q7. The molarity of a 100 mL solution containing 5
Q7. The molarity of a 100 mL solution containing 5.1 g of hydrogen peroxide is
0.15 M
1.5 M
3.0 M
50.0 M

16. ANSWER (B) EXPLANATION

17. Q8. In aqueous solution, hydrogen peroxide oxidises H2S to
Sulphur
Sulphuric acid
Caro’s acid
Marshall’s acid

18. ANSWER (A) EXPLANATION

19. Q9. The volume strength of 1 molar solution of H2O2 is
11.2
22.4
5.6 56

20. ANSWER (A) EXPLANATION

21. Q10. Last molecule of H2O is evolved from H2O2 by
Crystallisation
Evaporation
Distillation under reduced pressure
Electrolysis

22. ANSWER(A) EXPLANATION
Last trace of water is removed from H2O2 by crystallization.

23. Q11. The volume of 10 volume H2O2 solution that decolourises 200 mL of 2N KMnO4 solution in acidic medium is
112 mL
336 mL
220 mL
224 mL

24. ANSWER (D) EXPLANATION

25. Q12. Hydrolysis of 1 mole of peroxodisulphuric acid produces
Two moles of sulphuric acid
Two moles of peroxomonosulphuric acid
One mole of sulphuric acid and one mole of peroxomonosulphuric acid
One mole of sulphuric acid, one mole of peromonosulphuric acid and one mole of hydrogen peroxide

26. ANSWER (C) EXPLANATION

27. Q13. 100 volume hydrogen peroxide solution means
30.36 % H2O2
8.93 M
All are correct

28. ANSWER (D) EXPLANATION

29. Q14. Which of the following equations depict the oxidising nature of H2O2 ?

30. ANSWER (C) EXPLANATION
The reaction in which H2O2 is reduced, i.e. oxidation state of oxygen decreases from -1 to -2 depicts the oxidizing nature of H2O2. E.g.

31. Q15. What mass (in mg) of available O2 per litre is present in a solution of H2O2, 10 mL of which when treated requires 25 mL of N/20 KMnO4 for complete oxidation of it ?
4 g/L
2 g /L
1 g /L
8 g /L

32. ANSWER (B) EXPLANATION

33. Q16. What will be the volume of oxygen at NTP liberated upon the complete decomposition of 100 mL of 2 M hydrogen peroxide solution ?
2.24 L
22.4 L
44.8 L
11.2 L

34. ANSWER (A) EXPLANATION

35. Q17. Excess of Kl and dil. H2SO4 were mixed in 50 mL H2O2
Q17. Excess of Kl and dil. H2SO4 were mixed in 50 mL H2O2. Thus, I2 liberated requires 20 mL of 0.1 N Na2S2O3. What will be the strength of H2O2 in g L-1 ?
0.034
0.68
6.8
5.8

36. ANSWER (B) EXPLANATION

37. Q18. H2O2 is marked “22.4 volume “. How much of it (in mL) are required to oxidise 3.4 g of H2S gas ?
10 mL
70 mL
100 mL
1000 mL

38. ANSWER (C) EXPLANATION

39. Q19. Very pure hydrogen (99.9) can be made by which of the following processes ?
Reaction of methane. With steam
Mixing natural hydrocarbons of high molecular weight
Electrolysis of water
Reaction of salts like hydrides with water

40. ANSWER (C) EXPLANATION
Highly pure hydrogen is obtained by the electrolysis of water. Electrolysis of water is the decomposition of water (H2O) into oxygen (O2) and hydrogen gas (H2) due to an electric current being passed through the water.

41. Q40. In context with the industrial preparation of hydrogen from water gas (CO + H2), which of the following is the correct statement ?
CO is oxidized to CO2 with steam in the presence of catalyst followed by absorption of CO2 in alkali
CO and H2 are fractionally separated using differences in their densities
CO is removed by absorption in aqueous Cu2Cl2 solution
H2 is removed through occlusion with Pd.

42. ANSWER (A) EXPLANATION
𝐶𝑂+ 𝐻 2 + H 2 O=𝐶 𝑂 2 +2 H 2
2𝑁𝑎𝑂𝐻+ 𝑁𝑎 2 𝐶 𝑂 3 + 𝐻 2 𝑂

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