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a
NaCl.10H2O
b
LiCl.2H2O
c
CsCl.8H2O
d
KCl.10H2O
answer is B.
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Detailed Solution
Among all the IA group elements salts only "Li" salts can exist as hydrates, due to its small sizeEg :- LiCl.2H2ORemaining all the IA group elements salts can't form hydrates, due to their large sizesEg:- NaCl can't form hydrates in its pure form due to large size of Na+ ion