Solution P has a pH of 13, solution Q has a pH of 6 and solution R has a pH of 2.
Which solution will liberate ammonia from ammonium sulphate on heating?

Answer

To determine which solution will liberate ammonia from ammonium sulfate on heating, we can follow these steps:

### Step 1: Understand the pH values of the solutions
- Solution P has a pH of 13.
- Solution Q has a pH of 6.
- Solution R has a pH of 2.

### Step 2: Classify the solutions based on their pH
- A solution with a pH less than 7 is acidic.
- A solution with a pH equal to 7 is neutral.
- A solution with a pH greater than 7 is basic (alkaline).

From the given pH values:
- Solution P (pH 13) is basic.
- Solution Q (pH 6) is acidic.
- Solution R (pH 2) is acidic.

### Step 3: Identify the condition for liberating ammonia
Ammonium sulfate (NH4)2SO4 can liberate ammonia (NH3) when heated in the presence of a basic solution. This is because the basic solution reacts with the ammonium ions (NH4+) to produce ammonia gas.

### Step 4: Determine which solution is basic
Since we have classified the solutions:
- Solution P is basic (pH 13).
- Solutions Q and R are acidic (pH 6 and pH 2, respectively).

### Step 5: Conclusion
Only the basic solution (Solution P) can liberate ammonia from ammonium sulfate upon heating.

**Final Answer: Solution P will liberate ammonia from ammonium sulfate on heating.**

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