Give one example in each case
Change which occurs on mixing two substances, but can be reversed.

Explanation

### Step-by-Step Text Solution:

1. **Understanding the Question**: The question asks for examples of changes that occur when two substances are mixed, and these changes can be reversed. This means we are looking for physical changes, not chemical changes.

2. **Identifying Reversible Changes**: A reversible change is one where the original substances can be recovered after the change has taken place.

3. **Example 1 - Rice and Impurities**:
- When we mix rice with small impurities like stones or dust, this is a physical change.
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