Ammonia can be dried by

Options

A. conc. `H_2 SO_4`
B. `P_2 O_5`
C. anhydrous `CaCl_2`
D. None of these

Explanation

To determine how ammonia can be dried, we will analyze the options given in the question step by step.

### Step 1: Analyze the options
We have four options to consider for drying ammonia:
- A) Concentrated sulfuric acid
- B) P2O5
- C) Anhydrous calcium chloride
- D) None of these

### Step 2: Evaluate each option
1. **Concentrated sulfuric acid (H2SO4)**:
- When ammonia (NH3) reacts with concentrated sulfuric acid, it forms ammonium sulfate [(NH4)2SO4]. This means that ammonia is not being dried; instead, it is being converted into a different compound.

2. **P2O5 (Phosphorus pentoxide)**:
- P2O5 is a strong dehydrating agent, but when it reacts with ammonia, it does not dry it. Instead, it forms ammonium phosphate. Thus, this option does not dry ammonia.

3. **Anhydrous calcium chloride (CaCl2)**:
- Anhydrous calcium chloride is also a drying agent. However, when it interacts with ammonia, it forms a complex (CaCl2·3NH3), which means it does not dry ammonia but instead forms a hydrate.

4. **None of these**:
- Since none of the above options effectively dry ammonia, this option seems to be the correct choice.

### Step 3: Conclusion
Based on the analysis of the options, the correct answer is:
**D) None of these**