Name two salts each of calcium and magnesium which make the water hard?

Explanation

To answer the question about naming two salts each of calcium and magnesium that contribute to water hardness, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Water Hardness**:
- Water hardness is primarily caused by the presence of dissolved minerals, particularly calcium and magnesium salts.

2. **Identifying Calcium Salts**:
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