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Introduction to d and f Block Elements

Which one of ...

Question

Which one of the following ions is the most stable in aqueous solution?
(Atomic number. Ti = 22, V = 23, Cr = 24, Mn = 25)

$M n^{3 +}$

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$C r^{3 +}$

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$V^{3 +}$

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$T i^{3 +}$

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Solution

The correct option is B
$C r^{3 +}$

$C r^{3 +}$ has a $3 d^{3} 4 s^{0}$ configuration with an exactly half-filled $t_{2 g}^{3}$ is thus the most stable ion in the aqueous medium.

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3 d

T i^{4 +}, V^{2 +}, M n^{3 +}, C r^{3 +}

T i = 22, V = 23, M n = 25, C r = 24)

T i^{4 +}, V^{2 +}, M n^{3 +}, C r^{3 +}

(i) 2 M n O_{4}^{-} + 16 H^{+} + 5 S^{2 -} \to (i i) K M n O_{4} H e a t - -- \to

T i^{4 +}, V^{2 +}, M n^{3 +}, C r^{3 +}

(i) 2 M n O_{4}^{-} + 16 H^{+} + 5 S^{2 -} \to (i i) K M n O_{4} H e a t - -- \to

M n^{3 +}, C r^{3 +}, V^{3 +}

T i^{3 +}

^{3 +}

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