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Electronic Configuration and Oxidation States

When KMnO4 ...

Question

When $K M n O_{4}$ acts as an oxidising agent in acidic medium, the oxidation number of $M n$ decreases by :

A

1

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B

2

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C

3

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D

5

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Solution

The correct option is D $5$
When $K M n O_{4}$ acts as oxidizing agent in acidic medium, the oxidation number of manganese decreases from $+ 7$ to $+ 2$ .
Thus, the oxidation number decreases by $5$ .

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Q. Assertion :Equivalent mass of

K M n O_{4}

is equal to one-fifth of its molecular mass when it acts as an oxidising agent in acidic medium. Reason: Oxidation number of

M n

K M n O_{4}

+ 7

.

H C l

not used to make the medium acidic in oxidation reactions of

K M n O_{4}

in acidic medium?

K M n O_{4}

acts as an oxidising agent in alkaline medium. When alkaline

K M n O_{4}

is treated with KI, iodide ion is oxidised to:

K M n O_{4}

acts as an oxidising agent and forms

M n^{+ 2}

, the number of electrons transferred per molecule of

K M n O_{4}

K M n O_{4}

acts as an oxidising agent in acidic, basic or neutral medium. Reason:

K M n O_{4}

oxidises ferrous sulphate to ferric sulphate.

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