Duration: 3:29

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Directions \( \quad \) In the following
questions, an Assertion (A) is followed by a
corresponding Reason (R). Use the following keys to
choose the appropriate answer.
(a) Both A and R are correct; \( \mathrm{R} \) is the correct explanation of \( \mathrm{A} \).
(b) Both A and R are correct; and R is not the correct explanation of \( \mathrm{A} \).
(c) \( \mathrm{A} \) is correct; \( \mathrm{R} \) is incorrect.
(d) \( \mathrm{R} \) is correct; \( \mathrm{A} \) is incorrect.
Assertion (A) Element with electronic configuration \( [\mathrm{Ar}] 4 s^{2} 3 d^{5} \) is a \( d \)-block element.

Reason (R) The last electron enters the \( d \)-orbital.
\( \mathrm{P} \)
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