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In which of the following reactions H2 O...

In which of the following reactions `H_2 O_2` acts as a reducing agent ?
I. `H_2 O_2 + 2H^+ + 2e^- to 2H_2 O`
II. `H_2 O_2 - 2re^- to 2H^+`
III. `H_2 O_2 + 2e^- to 2OH^-`
IV. `H_2 O_2 + 2OH^(-) - 2e^(-) to O_2 + 2H_2 O`

Text Solution

Verified by Experts

The reducing agent itself gets oxidised (the O.N. increases)
(1) `H_2 overset(-1)(O_2) + 2H^(+) + 2e^(-) to 2H_2 overset(-2)O`
(2) `H_2 overset(-1)O_2 - 2e^(-) to overset(0)O_2 + 2H^+`
(3) `H_2overset(-1)O_2 + 2e^- to 2overset(2-)H^(-)`
(4) `H_2 overset(-1)O_2 + 2OH^(-) -2 e^(-) to overset(0)O_2 + 2H_2 O`
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MODERN PUBLICATION-HYDROGEN-Competition file (Objective Questions) (Multiple Choice Questions from Competitive Examinations)
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  15. the hardness of a water sample (in terms of Equivalents of CaCO(3)) ...

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  16. The metal that gives hydrogen gas upon treatment with both acid as wel...

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  17. The synonym for water gas when used in the production of methanol is :

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  19. The strength of 11.2 volume solution of H2O2 is: [Given that molar mas...

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  20. The temporary hardness of water is due to :

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