Assertion : $F e^{+ 3}$ ion is more stable than $F e^{+ 2}$ . Reason: $F e^{+ 3}$ ion has more number of unpaired electrons than $F e^{+ 2}$ .

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Assertion is incorrect but Reason is correct.

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
$F e^{+ 3} [A r] 3 d^{5}$ unpaired electrons 5
$F e^{+ 2} [A r] 3 d^{6}$ unpaired electrons 4
$F e^{+ 3}$ is more stable because of the half filled orbitals $(d^{5})$ which posses a symmetrical distribution of electrons and allow maximum number of exchanges.

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