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 A.
(c) \( \mathrm{A} \) is correct; \( \mathrm{R} \) is incorrect.
(d) \( \mathrm{R} \) is correct; \( \mathrm{A} \) is incorrect.
Assertion (A) \( \mathrm{Na}^{+} \)and \( \mathrm{Al}^{3+} \) are isoelectronic species.
Reason (R) Na belongs to \( s \)-block, while Al belongs to \( p \)-block.
\( \mathrm{P} \)
W
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