Statement-I : Alums are isomorphous crystalline double salts, which are soluble in water.
Statement-II : The aq. Solutions of alums have acidic character due to hydrolysis.

Options

A. If both statement-I and statement-II are true and the statement-II is the correct explanation of statement-I.
B. If both statement-I and statement-II are true and the statement-II is not the correct explanation of statement-I.
C. If statement-I is false but statement-II is true.
D. If statement-I is true but the statement-II is false.

Explanation

To analyze the given statements about alums, we will break down each statement and evaluate their validity step by step.

### Step 1: Understanding Statement-I
**Statement-I:** Alums are isomorphous crystalline double salts, which are soluble in water.

1. **Definition of Alums:** Alums are double salts that typically consist of a sulfate of a univalent metal and a sulfate of a trivalent metal, along with water of crystallization.
2. **General Formula:** The general formula for alums can be represented as \( MSO_4 \cdot M'SO_4 \cdot 12H_2O \) where \( M \) is a univalent metal and \( M' \) is a trivalent metal.
3. **Solubility in Water:** Alums are known to be soluble in water due to their ionic nature and the presence of water of crystallization.

**Conclusion for Statement-I:** This statement is true.

### Step 2: Understanding Statement-II
**Statement-II:** The aqueous solutions of alums have acidic character due to hydrolysis.

1. **Hydrolysis of Alums:** When alums dissolve in water, they dissociate into their constituent ions. The trivalent metal ion (e.g., \( Al^{3+} \)) can undergo hydrolysis.
2. **Hydrolysis Reaction:** The hydrolysis of \( Al^{3+} \) can be represented as:
\[ Al^{3+} + 3H_2O \rightarrow Al(OH)_3 + 3H^+ \]
This reaction produces \( H^+ \) ions, which contribute to the acidity of the solution.
3. **pH of Aqueous Solutions:** The presence of \( H^+ \) ions lowers the pH of the solution, indicating that the solution is acidic.

**Conclusion for Statement-II:** This statement is also true.

### Step 3: Relationship Between the Statements
- While both statements are true, they do not directly explain each other. Statement-I describes the nature and solubility of alums, while Statement-II explains the acidic character of their aqueous solutions due to hydrolysis.

### Final Conclusion
Both statements are true, but Statement-II is not the correct explanation for Statement-I. Thus, the correct answer is that both statements are true, but Statement-II does not explain Statement-I.

### Answer Options
- The correct option is: **Both Statement-I and Statement-II are true, but Statement-II is not the correct explanation of Statement-I.**

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