Which of the following compound show sublimation

Options

A. `NH_4 Cl`
B. `CaCO_3`
C. `BaSO_4`
D. `CaHPO_3`

Explanation

To determine which of the given compounds undergo sublimation, we need to understand the process of sublimation itself. Sublimation is the transition of a substance from the solid phase directly to the gas phase without passing through the liquid phase.

Let's analyze the compounds one by one:

1. **Ammonium Chloride (NH4Cl)**:
- When heated, ammonium chloride sublimates. It directly converts from solid to gas without becoming a liquid.
- **Conclusion**: NH4Cl undergoes sublimation.

2. **Other Compounds**:
- Without specific names of the other compounds, we can generally state that many compounds do not sublimate. Common examples of compounds that do not undergo sublimation include salts like sodium chloride (NaCl) or other ionic compounds, which typically melt into a liquid before vaporizing.

Based on the information provided in the video and the general knowledge of sublimation, the only compound among the options that shows sublimation is **Ammonium Chloride (NH4Cl)**.

### Final Answer:
The compound that shows sublimation is **Ammonium Chloride (NH4Cl)**.

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