Which of the following pairs involves isoelectronic ions?

^{3 +}

and Fe

^{2 +}

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^{2 +}

and Fe

^{3 +}

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^{3 +}

and mn

^{2 +}

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^{2 +}

and CO

^{2 +}

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Solution

The correct option is B Mn $^{2 +}$ and Fe $^{3 +}$
Mn $^{2 +}$ and Fe $^{3 +}$ ions have 23 electrons, thus, they are isoelectronic.

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Question 20

In which of the following pairs, the ions are isoelectronic ?

(a) $N a^{+}, M g^{2 +}$ (b) $A l^{3 +}, O^{-}$ (c) $N a^{+}, O^{2 -}$ (d) $N^{3 -}, C l^{-}$

B e^{2 +}

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