Assertion In aqueous solution Mohr' s salt gives `NH_(4)^(o+)Fe^(2+)` and `SO_(4)^(2-)` ions
Reason Mohr' s salt is a double salt .

Options

A. If both `(A)` and ` (R )` are correct and `(R )` is the correct explanation of `(A ) ` .
B. If both `(A)` and ` (R )` are correct and `(R )` is the correct explanation of `(A ) ` .
C. If`(A)` is correct, but `( R )` is incorrect .
D. Both `(A)` and `(R ) ` are incorrect .

Answer

To solve the question, we need to analyze both the assertion and the reason provided.

### Step 1: Understanding the Assertion
The assertion states that "In aqueous solution, Mohr's salt gives \( NH_4^+ \), \( Fe^{2+} \), and \( SO_4^{2-} \) ions."

- Mohr's salt is a double salt with the formula \( FeSO_4 \cdot (NH_4)_2SO_4 \cdot 6H_2O \).
- When Mohr's salt is dissolved in water, it dissociates into its constituent ions.

### Step 2: Dissociation of Mohr's Salt
When Mohr's salt dissolves in water, it dissociates as follows:
\[ FeSO_4 \cdot (NH_4)_2SO_4 \cdot 6H_2O \rightarrow Fe^{2+} + 2NH_4^+ + 2SO_4^{2-} + 6H_2O \]

From this dissociation, we can see that:
- \( Fe^{2+} \) ions are produced.
- \( NH_4^+ \) ions are produced.
- \( SO_4^{2-} \) ions are produced.

Thus, the assertion is correct.

### Step 3: Understanding the Reason
The reason states that "Mohr's salt is a double salt."

- A double salt is a type of salt that contains more than one cation or anion in its structure and can dissociate into its individual ions when dissolved in water.
- Mohr's salt is indeed classified as a double salt because it contains two different cations: \( Fe^{2+} \) and \( NH_4^+ \).

### Step 4: Conclusion
Both the assertion and the reason are correct. The reason correctly explains why the assertion is true.

### Final Answer
Both the assertion and reason are correct, and the reason is the correct explanation of the assertion.