Crude common salt is hygroscopic because of impurities of ______________ and _____________ .

Explanation

To solve the question "Crude common salt is hygroscopic because of impurities of ______________ and _____________," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the term "hygroscopic":**
- Hygroscopic substances are those that can absorb moisture from the atmosphere. This property is important in understanding why crude common salt behaves in this manner.

**Hint:** Remember that hygroscopic materials attract water vapor from the air.
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