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Question

Assertion :The number of unpaired electrons in the following gaseous ions:
Mn3+,Cr3+,V3+ and Ti3+ are 4, 3, 2 and 1 respectively. Reason: Among these Cr3+ is most stable in aqueous solution.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
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
Mn3+=[Ar]183d4,Cr3+=[Ar]183d3,V2+=[Ar]183d2,Ti3+=[Ar]183d1 and Cr3+ is most stable due to greater CFSE of t32g (having a half-filled configuration in t29 level) configuration in aqueous solution.

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