Question:

Which of the following salts form hydrates?
\[ CaCl_2 \qquad NaCl \qquad LiCl \qquad BaCl_2 \qquad KCl \] \[ I \qquad\quad II \qquad\quad III \qquad\quad IV \qquad\quad V \]

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Salts containing small or highly polarising cations often form hydrates because they strongly attract water molecules into the crystal lattice.
Updated On: Jun 18, 2026
  • III, IV, V only
  • II, III, IV only
  • II, III, V only
  • I, III, IV only
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The Correct Option is D

Solution and Explanation

Step 1: Understand hydrate formation.
Hydrates are salts that contain water molecules as part of their crystalline structure.
Such water molecules are called water of crystallization.

Step 2: Check the given salts.

\(CaCl_2\) forms hydrates such as \[ CaCl_2\cdot 2H_2O \] and \[ CaCl_2\cdot 6H_2O \] So, \(CaCl_2\) forms hydrates.
\(NaCl\) generally does not form a stable hydrate under ordinary conditions.
So, \(NaCl\) is not included.
\(LiCl\) forms hydrates because \(Li^+\) has a small size and high hydration tendency.
So, \(LiCl\) forms hydrates.
\(BaCl_2\) forms hydrates such as \[ BaCl_2\cdot 2H_2O \] So, \(BaCl_2\) forms hydrates.
\(KCl\) generally does not form stable hydrates under ordinary conditions.
So, \(KCl\) is not included.

Step 3: Select the correct set.

The salts forming hydrates are \[ CaCl_2,\ LiCl,\ BaCl_2 \] That is, \[ I,\ III,\ IV \]

Step 4: Final conclusion.

Therefore, \[ \boxed{I,\ III,\ IV\ \text{only}} \] Hence, the correct option is (4).
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