Which of the following is sublimate ?

Options

A. NaCl
B. `NH_(4)Cl`
C. `CaCl_(2)`
D. `CaOCl_(2)`

Answer

To determine which of the given compounds is a sublimate, we need to understand the concept of sublimation and analyze each option based on their properties.

### Step-by-Step Solution:

1. **Understanding Sublimation**:
- Sublimation is the process in which a solid converts directly into a gas without passing through the liquid phase. This occurs when the intermolecular forces in the solid are weak enough to allow the molecules to escape into the vapor phase.

2. **Analyzing the Options**:
- **Option A: NaCl (Sodium Chloride)**:
- NaCl is an ionic compound. Ionic compounds typically have high melting and boiling points due to the strong electrostatic forces between the ions. Therefore, NaCl does not sublimate easily at atmospheric pressure.

- **Option B: NH4Cl (Ammonium Chloride)**:
- NH4Cl is a molecular compound with relatively weak intermolecular forces compared to ionic compounds. It can sublimate, as it can convert from solid to vapor directly under certain conditions.

- **Option C: CaCl2 (Calcium Chloride)**:
- CaCl2 is also an ionic compound with strong ionic bonds. Like NaCl, it has a high melting point and does not sublimate easily at atmospheric pressure.

- **Option D: Ca(OCl)2 (Calcium Oxychloride or Bleaching Powder)**:
- This compound is complex and has strong bonds due to its ionic nature. It also does not sublimate easily due to these strong interactions.

3. **Conclusion**:
- Among the options provided, only **NH4Cl (Ammonium Chloride)** is capable of sublimation under normal atmospheric conditions. Therefore, the correct answer is **Option B**.