Name two substances from daily life which contain acid and two substances which contain base .

Explanation

### Step-by-Step Solution:

1. **Identify Substances Containing Acids:**
- In our daily life, we commonly use vinegar and lemon juice.
- **Vinegar:** It contains acetic acid, which is used as a food preservative and flavoring agent.
- **Lemon Juice:** It contains citric acid, which is responsible for its sour taste.

2. **Identify Substances Containing Bases:**
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