Assertion :Manganese (atomic number 25) has a less favourable electron affinity than its neighbours on either side. Reason: The manganese has stable, $[A r]^{18} 3 d^{5} 4 s^{2}$ electrons configuration.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Manganese has a less favorable electron affinity than it's neighbor on either side because it have stable $[A r]^{8} 3 d^{5} 4 s^{2}$ configuration due to which it have five unpaired electrons, thus having maximum spin mutiplicity.

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