Question

41. When hydrogen gas is bubbled through acidified KMnO4, colour is not discharged. The colour of
the acidified KMnO4 solution can be discharged by
(a) Heating the solution
(b) Cooling the solution
(c) Adding some zinc pieces
(d) Adding some copper pieces
both
​

Answer 1

Answer:

d)adding some zinc pieces

Explanation:

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Answer 2

Answer:

The correct option is (c) Adding some zinc pieces.

Explanation:

When hydrogen gas is bubbled through acidified KMnO4, the color of the solution does not change because hydrogen gas is not a strong enough reducing agent to reduce the permanganate ion (MnO4-) to Mn2+.

To discharge the color of acidified KMnO4 solution, a stronger reducing agent such as zinc (Zn) is needed. Zinc has a higher reduction potential than hydrogen gas and can reduce the permanganate ion to Mn2+. The reaction between zinc and KMnO4 is:

2 KMnO4 + 3 Zn + 6 H2SO4 → K2SO4 + ZnSO4 + 2 MnSO4 + 3 Zn(HSO4)2 + 3 H2O

This reaction produces colorless zinc sulfate and manganese sulfate, and thus the color of the acidified KMnO4 solution is discharged.

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