Which of the following statements are correct?
I. The sour taste of tamarind is due to tartaric acid which is an organic acid.
II. Fermented milk and curd contain lactic acid. III. Acids are generally stored in glass bottles. IV. Acidic solutions conduct electricity

Options

A. I, II and III only
B. I and IV only
C. II and IV only
D. I, II, III and IV

Explanation

To determine which of the statements are correct, let's analyze each statement one by one.

### Step 1: Analyze Statement I
**Statement I:** The sour taste of tamarind is due to tartaric acid which is an organic acid.

- **Explanation:** Tartaric acid is indeed an organic acid found in various fruits, including tamarind. Its presence contributes to the sour taste of tamarind.
- **Conclusion:** This statement is **correct**.

### Step 2: Analyze Statement II
**Statement II:** Fermented milk and curd contain lactic acid.

- **Explanation:** Fermented milk products, such as yogurt and curd, are produced through the fermentation process where lactic acid bacteria convert lactose into lactic acid. Thus, lactic acid is present in these products.
- **Conclusion:** This statement is **correct**.

### Step 3: Analyze Statement III
**Statement III:** Acids are generally stored in glass bottles.

- **Explanation:** Many acids can react with plastic materials, potentially causing degradation of the container and contamination of the acid. Therefore, acids are typically stored in glass bottles, which are resistant to corrosion by acids.
- **Conclusion:** This statement is **correct**.

### Step 4: Analyze Statement IV
**Statement IV:** Acidic solutions conduct electricity.

- **Explanation:** Acids dissociate in water to produce ions, which are responsible for conducting electricity. Therefore, acidic solutions are good conductors of electricity.
- **Conclusion:** This statement is **correct**.

### Final Conclusion
All four statements are correct:
- **I. Correct**
- **II. Correct**
- **III. Correct**
- **IV. Correct**

### Summary of Correct Statements
- All statements (I, II, III, and IV) are correct.