Given below are two statements: One is labelled as Assertion (A) and other is labelled as Reason (R)
Assertion (A): In aqueous solution $C r^{2 +}$ is reducing while $M n^{+ 3}$ is oxidising in nature.
Reason (R): Extra stability of half – filled electronic configuration is observed than incompletely filled electronic configuration.
In the light of the above statements, choose the most appropriate answer from the options given below.

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Both A and R are correct and R is the correct explanation of A

Both A and R are correct but R is NOT the correct explanation of A

A is correct but R is not correct

A is not correct but R is correct

answer is A.

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Detailed Solution

$C r^{2 +}$ is reductant as its configuration changes from $d^{4}$ to $d^{3}$ $(C r^{+ 3})$ , which has half-filled $t_{2 g}$ level. On the other hand $M n^{+ 3} t o M n^{+ 2}$ result in half – filled $d^{5}$ configuration which has extra statbility