(C) The assertion is correct because transition metals have partially filled $d$-orbitals,allowing them to lose electrons from both the $ns$ and $(n-1

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If the Assertion is correct but Reason is incorrect.

(C) The assertion is correct because transition metals have partially filled $d$-orbitals,allowing them to lose electrons from both the $ns$ and $(n-1)d$ subshells.The reason is incorrect because the energy difference between the $ns$ and $(n-1)d$ electrons is actually very small,which is precisely why both sets of electrons can participate in bond formation,leading to variable valency.

Class 12 Chemistry d-and f-Block Elements General Characteristics

Medium

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

AIIMS 2017 All AIIMS

A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
C
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.