An element which reacts with water to form a solution which turns phenolphthalein solution pink is

Options

A. S
B. Ca
C. C
D. Ag

Explanation

To solve the question, "An element which reacts with water to form a solution which turns phenolphthalein solution pink is," we will follow these steps:

### Step-by-Step Solution:

1. **Understand the Role of Phenolphthalein**:
- Phenolphthalein is a pH indicator that changes color based on the acidity or basicity of a solution. It is colorless in acidic solutions and turns pink in basic solutions.

**Hint**: Remember that phenolphthalein indicates whether a solution is acidic or basic.

2. **Identify the Requirement**:
- The question asks for an element that reacts with water to produce a solution that turns phenolphthalein pink. This means the solution must be basic.

**Hint**: Focus on elements that can react with water to form basic solutions.

3. **Evaluate the Given Options**:
- The options provided are Sulphur, Calcium, Carbon, and Argon.
- **Sulphur**: Does not react with water to form a base.
- **Calcium**: Reacts with water to form calcium hydroxide (Ca(OH)₂), which is a strong base.
- **Carbon**: Does not react with water to form a base.
- **Argon**: Is a noble gas and does not react with water.

**Hint**: Check each element's reactivity with water and the products formed.

4. **Determine the Correct Element**:
- Since calcium reacts with water to produce calcium hydroxide, which is basic, the solution will turn phenolphthalein pink.

**Hint**: Identify which element produces a basic solution upon reacting with water.

5. **Conclusion**:
- The element that reacts with water to form a solution that turns phenolphthalein pink is **Calcium**.

**Final Answer**: Calcium