MHT CET · Chemistry · s Block Elements

Which among the following alkali metal chloride crystallises in form of hydrate?

A \(\mathrm{LiCl}\)
B KCl
C \(\mathrm{CsCl}\)
D NaCl

Verified Solution

Answer & Solution

Correct Answer

(A) \(\mathrm{LiCl}\)

Step-by-step Solution

Detailed explanation

Lithium is smallest in size among the alkali metals. Hence \(\mathrm{Li}^{+}\)ion can polarize water molecules more easily than other alkali metals. As the size of the ions increases, their polarizing power decreases. Hence, other alkali metal ions usually form anhydrous salts.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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