Assertion :Transition metals show variable valency. Reason: Transition metal ions possess unpaired electrons in 'd' subshell.

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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Both Assertion and Reason are incorrect

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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
The transition metal ions have unpaired d electrons which jump from one orbital to another. Thus the transition metals have variable valency. For eg: Fe has valency of $2$ and $3$ in $F e {C l}_{2}, {F e}_{2} O_{3}$ respectively. Thus correct option is B as reason and does not explain assertion.

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