Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R . Assertion A : In aqueous solutions Cr 2 + is reducing while Mn 3 + is oxidising in nature. Reaso

Question

Given below are two statements : one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R) .$

Assertion $(A)$ : In aqueous solutions ${Cr}^{2 +}$ is reducing while ${Mn}^{3 +}$ is oxidising in nature.

Reason $(R) :$ Extra stability to half filled electronic configuration is observed than incompletely filled electronic configuration.

In the light of the above statement, choose the most appropriate answer from the options given below:

TestHub · Accepted Answer

A reducing agent, or reductant, loses electrons and is oxidized in a chemical reaction. A reducing agent is typically in one of its lower possible oxidation states, and is known as the electron donor.

${Cr}^{2 +}$ is reducing as it configuration changes from $d^{4}$ to $d^{3}$ due to formation of ${Cr}^{3 +},$ which has half filled $t_{2 g}$ level, on other hand, the change ${Mn}^{3 +}$ to ${Mn}^{2 +}$ result half filled $d^{5}$ configuration which has extra stability.

Chemistry - Complete d-block Question with Solution | TestHub

Options:

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