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Which of the following chlorides exist a...

Which of the following chlorides exist as hydrates?
(i) `MgCl_(2)` (ii) NaCl
(iii) KCl (iv) `CaCl_92)`

A

i,ii

B

ii,iii

C

i,iv

D

iii,iv

Text Solution

Verified by Experts

The correct Answer is:
C
The hydration enthalpies of alkaline earth metal ions are larger than those of alkali metal ions. Thus, the compounds of alkaline earth metals are more extensvely hydrated than those of alkali metals. For example, `MgCl_(2)` and `CaCl_(2)` exist as `MgCl_(2),6H_(2)O` and `CaCl_(2).6H_(2)O`, respectively. while NaCl and KCl do not form such hydrates.
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