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Standard XII

Chemistry

Orbitals

Which one of ...

Question

Which one of the following sets of ions have same outershell electronic configuration?

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

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

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

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

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Solution

The correct option is B $C r^{+}, M n^{2 +}, F e^{3 +}$
The outershell electronic configuration of $C r^{+}, M n^{2 +},$ and $F e^{3 +}$ is same.

$C r^{+} = [A r] 3 d^{5}$

$M n^{2 +} = [A r] 3 d^{5}$

$F e^{3 +} = [A r] 3 d^{5}$

Hence, the correct option is $D$

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Similar questions

Q. Consider the ions

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

. Strongest oxidizing ion is ?

Q. Consider the ions

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

. Strongest reducing ion is ?

Q. For

M^{2 +} / M

and

M^{3 +} / M^{2 +}

systems the

E^{⊖}

values for some metals are as follows:

$C r^{2 +} / C r$	$- 0.9 V$ $	$C r^{3} / C r^{2 +}$	$- 0.4 V$
$M n^{2 +} / M n$	$- 1.2 V$	$M n^{3 +} / M n^{2 +}$	$+ 1.5 V$
$F e^{2 +} / F e$	$- 0.4 V$	$F e^{3 +} / F e^{2 +}$	$+ 0.8 V$

Use this data to comment upon:
(i) the stability of

F e^{3 +}

in acid solution as compared to that of

C r^{3 +}

M n^{3 +}

and
(ii) the ease with which iron can be oxidised as compared to a similar process for either chromium or manganese metal

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) $S C^{3 +}, C r^{3 +}$

While $F e^{3 +}$ is stable, $M n^{3 +}$ is not stabe in acid solution because:
$(M n^{3 +} + e^{-} \to M n^{2 +}, E^{\circ} = 1.5 V; O_{2} + 4 H^{+} + 4 e^{-} \to 2 H_{2} O, E^{\circ} = + 1.23 V; F e^{3 +} + e^{-} \to F e^{2 +}, E^{\circ} = 0.77 V)$

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Which one of the following sets of ions have same outershell electronic configuration?

The correct option is B Cr+,Mn2+,Fe3+The outershell electronic configuration of Cr+,Mn2+, and Fe3+ is same.Cr+=[Ar]3d5Mn2+=[Ar]3d5Fe3+=[Ar]3d5Hence, the correct option is D

The correct option is B $C r^{+}, M n^{2 +}, F e^{3 +}$
The outershell electronic configuration of $C r^{+}, M n^{2 +},$ and $F e^{3 +}$ is same.

$C r^{+} = [A r] 3 d^{5}$

$M n^{2 +} = [A r] 3 d^{5}$

$F e^{3 +} = [A r] 3 d^{5}$

Hence, the correct option is $D$