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Oxidising Reagent and Reducing Reagent

Identify oxid...

Question

Identify oxidant and reductant in the following redox reaction.
$2 M n O_{2} + 4 K O H + O_{2} ⟶ {2 K}_{2} M n O_{4} + 2 H_{2} O$

A

Oxidant:

O_{2}

; Reductant:

M n O_{2}

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B

Oxidant:

O_{2}

; Reductant:

K O H

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C

Oxidant:

M n O_{2}

; Reductant:

O_{2}

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D

None of these

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Solution

The correct option is A Oxidant: $O_{2}$ ; Reductant: $M n O_{2}$
The balanced redox reaction is as follows:
$2 M n O_{2} + 4 K O H + O_{2} ⟶ {2 K}_{2} M n O_{4} + 2 H_{2} O$
The oxidation number of oxygen changes from $0$ to $- 1$ .
Thus, oxygen is reduced.
Thus, the oxidant is $O_{2}$ .
The oxidation number of Mn changes from $+ 4$ to $+ 6$ . Thus, $M n$ is oxidized.
Hence, $M n O_{2}$ is reductant.

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