Assertion (A): Transition metals show variable valency.
Reason (R): Transition metals have a large energy difference between the $n s^{2}$ and $(n - 1) d$ electrons.

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If (A) and (R) are correct statements and (R) is the correct explanation for (A)

If (A) and (R) are correct statements and (R) is not the explanation for (A)

(A) is correct, (R) is incorrect

(A) is incorrect, (R) is correct

answer is C.

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Detailed Solution

Actually transition metal show variable valency due to very small difference between the $n s^{2}$ and $(n - 1) d$ electrons, therefore assertion is correct but reason is false.

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