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Chemistry-Oxidation Number

NEET Chemistry Oxidation Number MCQ Question

Type: MCQ-numerical-Medium-Class 11

In the reaction 2MnO4−(aq)+Br−(aq)+H2O(l)→2MnO2(s)+BrO3−(aq)+2OH−(aq)2MnO_4^- (aq) + Br^- (aq) + H_2O(l) \rightarrow 2MnO_2(s) + BrO_3^- (aq) + 2OH^- (aq), what is the change in the oxidation number of manganese?

A

Decreases from +7 to +4

B

Increases from +4 to +7

C

Decreases from +6 to +2

D

Increases from +3 to +6

Correct Answer

Option A

Detailed Explanation

In the given reaction, manganese in MnO4−MnO_4^- has an oxidation number of +7, which decreases to +4 in MnO2MnO_2, indicating a reduction. This change is consistent with the balancing method described in the NCERT context.

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