(a) How is pH paper used to find the pH of a solution?
(b) The pH value of water is 7. What will be the pH value of (i) aqueous solution of sodium hydroxide and (ii) dil. HCl.

Explanation

### Step-by-Step Solution:

#### (a) How is pH paper used to find the pH of a solution?

1. **Understanding pH Paper**: pH paper is a type of indicator paper that changes color based on the pH level of the solution it comes into contact with. It is sensitive to the concentration of hydrogen ions (H⁺) in the solution.

2. **Using pH Paper**:
- Dip a strip of pH paper into the solution you want to test.
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