Consider the following statements.
(i) Baking soda is an acidic salt whereas washing soda is a basic salt.
(ii) The aqueous solution of common salt does not change the colour of either red litmus solution or blue litmus solution.
(iii) Amla tastes sour whereas soap solution is bitter in taste.
(iv) The water extract of spinach does not change the colour of red litmus solution. Which of the above statements are correct ?

Options

A. (i), (ii) and (iii)
B. (i) and (iii)
C. (ii) and (iii)
D. (ii), (iii) and (iv)

Explanation

To determine which statements are correct, let's analyze each one step by step.

### Step 1: Analyze Statement (i)
**Statement:** Baking soda is an acidic salt whereas washing soda is a basic salt.

- **Baking soda (NaHCO₃)**: This compound contains a replaceable hydrogen ion (H⁺), making it an acidic salt.
- **Washing soda (Na₂CO₃)**: This compound does not contain a replaceable hydrogen ion. It is formed from a strong base (NaOH) and a weak acid (H₂CO₃), making it a neutral salt, not a basic salt.

**Conclusion:** This statement is **incorrect**.

### Step 2: Analyze Statement (ii)
**Statement:** The aqueous solution of common salt does not change the color of either red litmus solution or blue litmus solution.

- **Common salt (NaCl)**: It is formed from a strong acid (HCl) and a strong base (NaOH). When dissolved in water, it forms a neutral solution.
- **Litmus Test**: Neutral solutions do not change the color of either red or blue litmus paper.

**Conclusion:** This statement is **correct**.

### Step 3: Analyze Statement (iii)
**Statement:** Amla tastes sour whereas soap solution is bitter in taste.

- **Amla**: Contains ascorbic acid (vitamin C), which gives it a sour taste.
- **Soap solution**: Soap is alkaline (basic) in nature, and basic substances typically have a bitter taste.

**Conclusion:** This statement is **correct**.

### Step 4: Analyze Statement (iv)
**Statement:** The water extract of spinach does not change the color of red litmus solution.

- **Water extract of spinach**: Contains oxalic acid, which is an acid.
- **Litmus Test**: An acidic solution will turn blue litmus red. However, if the concentration is low, it may not show a change.

**Conclusion:** This statement is **correct** because it may not change the color significantly if the concentration is low.

### Final Conclusion
The correct statements are:
- Statement (ii) is correct.
- Statement (iii) is correct.
- Statement (iv) is correct.

Thus, the correct options are **2, 3, and 4**.