The pair of ions having same electronic configuration is ?

C r^{3 +}, F e^{3 +}

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F e^{3 +}, M n^{2 +}

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F e^{3 +}, C o^{3 +}

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S c^{3 +}, C r^{3 +}

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Solution

The correct option is D $F e^{3 +}, M n^{2 +}$
The valence shell electronic configuration of the given atom and their corresponding ions are:
A. $C r (Z = 24 : 3 d^{5} 4 s^{1}$ and $C r^{3 +} : 3 d^{3}$
$F e, Z = 26 : 3 d^{6} 4 s^{2}$ and $F e^{3 +} : 3 d^{5}$
thus, $C r^{3 +}$ and $F e^{3 +}$ have different electronic configuration.

B. $F e, Z = 26 : 3 d^{6} 4 s^{2}$ and $F e^{3 +} : 3 d^{5}$
$M n, Z = 25 : 3 d^{5} 4 s^{2}$ and $M n^{2 +} : 3 d^{5}$
thus, $M n^{2 +}$ and $F e^{3 +}$ have same electronic configuration.

C. $F e, Z = 26 : 3 d^{6} 4 s^{2}$ and $F e^{3 +} : 3 d^{5}$
$C o, Z = 27 : 3 d^{7} 4 s^{2}$ and $C o^{3 +} : 3 d^{6}$
thus, $C o^{3 +}$ and $F e^{3 +}$ have different electronic configuration.

D. $C r (Z = 24 : 3 d^{5} 4 s^{1}$ and $C r^{3 +} : 3 d^{3}$
$S c, Z = 21 : 3 d^{1} 4 s^{2}$ and $S c^{3 +} : 3 d^{0}$
thus, $C r^{3 +}$ and $S c^{3 +}$ have different electronic configuration.

Therefore $F e^{3 +} a n d M n^{2 +}$ have the same electronic configuration.

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Question 14

The pair of ions having same electronic configuration is.............

(a) $C r^{3 +}, F e^{3 +}$ (b) $F e^{3 +}, M n^{2 +} +$ (c) $F e^{3 +}, C o^{3 +}$ (d) $S C^{3 +}, C r^{3 +}$

F e^{2 +}, F e^{3 +}, C r^{2 +}, C r^{3 +}, M n^{2 +}, M n^{3 +}

F e^{2 +}, F e^{3 +}, C r^{2 +}, C r^{3 +}, M n^{2 +}, M n^{3 +}

The oxidation half reaction for following reaction is

Fe²⁺(aq) + Cr₂O₇^2-(aq) → Fe³⁺ (aq) + Cr³⁺(aq)

C r^{3 +}

F e^{3 +}

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