AP EAMCET · Chemistry · Hydrogen

Which of the following salts form hydrates?
\(\begin{array}{lcccc}\mathrm{CaCl}_2 & \mathrm{NaCl} & \mathrm{LiCl} & \mathrm{BaCl}_2 & \mathrm{KCl} \\ \text { I } & \text { II } & \text { III } & \text { IV } & \text { V }\end{array}\)

A III, IV, V only
B II, III, IV only
C II, III, V only
D I, III, IV only

Verified Solution

Answer & Solution

Correct Answer

(D) I, III, IV only

Step-by-step Solution

Detailed explanation

\(\mathrm{BaCl}_2\) and \(\mathrm{CaCl}_2\) are compounds of alkaline earth metals and they are more extensively hydrated than those of alkali metals. This is because, the hydration enthalpies of alkaline earth metal ions are larger than those of alkali metal ion. But among…

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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Which of the following salts form hydrates?\(\begin{array}{lcccc}\mathrm{CaCl}_2 & \mathrm{NaCl} & \mathrm{LiCl} & \mathrm{BaCl}_2 & \mathrm{KCl} \\ \text { I } & \text { II } & \text { III } & \text { IV } & \text { V }\end{array}\)

Step-by-step Solution

Which of the following salts form hydrates?
\(\begin{array}{lcccc}\mathrm{CaCl}_2 & \mathrm{NaCl} & \mathrm{LiCl} & \mathrm{BaCl}_2 & \mathrm{KCl} \\ \text { I } & \text { II } & \text { III } & \text { IV } & \text { V }\end{array}\)