JEE Advanced · Chemistry · 22. d & f Block

The correct statement(s) about $C r^{2 +}$ and $M n^{3 +}$ is (are)
[Atomic number of Cr = 24 and Mn = 25]

A $C r^{2 +}$ is a reducing agent
B $M n^{3 +}$ is an oxidizing agent
C Both $C r^{2 +}$ and $M n^{3 +}$ exhibit $d^{4}$ electronic configuration
D When $C r^{2 +}$ is used as a reducing agent, the chromium ion attains $d^{5}$ electronic configuration.

Verified Solution

Answer & Solution

Correct Answer

(A) $C r^{2 +}$ is a reducing agent

Step-by-step Solution

Detailed explanation

C r^{2 +} + M n^{3 +} ⇌ C r^{3 +} + M n^{2 +}

C r^{2 +}

is a reducing agent agent

M n^{3 +}

is an oxidizing agent both

C r^{2 +} & M n^{3 +}

exhibit

d^{4}

electronic configuration.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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	List I		List II
$P$	$t_{2 g}^{6} e_{g}^{0}$	$1$	${[Fe {(H_{2} O)}_{6}]}^{2 +}$
$Q$	$t_{2 g}^{3} e_{g}^{2}$	$2$	${[Mn {(H_{2} O)}_{6}]}^{2 +}$
$R$	$e^{2} t_{2}^{3}$	$3$	${[Co {({NH}_{3})}_{6}]}^{3 +}$
$S$	$t_{2 g}^{4} e_{g}^{2}$	$4$	${[{FeCl}_{4}]}^{-}$
		$5$	${[{CoCl}_{4}]}^{2 -}$

The correct statement(s) about Cr2+ and Mn3+ is (are)[Atomic number of Cr = 24 and Mn = 25]

Step-by-step Solution

The correct statement(s) about $C r^{2 +}$ and $M n^{3 +}$ is (are)
[Atomic number of Cr = 24 and Mn = 25]