Name two compounds which are purified by sublimation.

Explanation

To answer the question "Name two compounds which are purified by sublimation," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Process of Sublimation**:
- Sublimation is a process where a solid turns directly into vapor without passing through the liquid state when heated. This process can be used to purify certain compounds.

2. **Identify Characteristics of Compounds Suitable for Sublimation**:
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