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Which of the following is CORRECT regarding S-block elements?
(I) Pure NaCl is hygroscopic.
(II) $(n - 1) d$ subshell is vacant only for lithium, where ‘ n ’ is valence shell
(III) Aqueous $N a H C O_{3}$ solution is more basic than $N a_{2} C O_{3}$ solution
(IV) Both $L i^{+}$ and $M g^{2 +}$ do not form alums

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$(I), (I I I) o n l y$

$(IV) o n l y$

$(I), (IV) o n l y$

$(II), (III) o n l y$

answer is D.

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Detailed Solution

Common salt absorbs water due to presence of impurities of
$C a C l_{2} a n d M g C L_{2}$

$C O_{3}^{2 -} + H_{2} O \overset{}{⇌} H C O_{3}^{- 1} + O H^{-}$
$H C O_{3}^{- 1}$ is amphiprotic and hence pH is less.

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