When in the blue solution of Copper sulphate zinc strip is dipped, after some time the colour changes to

Options

A. pink
B. green
C. colourless
D. remains blue.

Explanation

**Step-by-Step Solution:**

1. **Identify the Initial Solution**: The initial solution is a blue solution of copper sulfate (CuSO4). The blue color is due to the presence of copper ions (Cu²⁺) in the solution.

2. **Introduce the Zinc Strip**: A zinc strip is dipped into the blue copper sulfate solution. Zinc (Zn) is a more reactive metal compared to copper (Cu).

3. **Understand the Reaction**: Since zinc is more reactive, it will displace copper from the copper sulfate solution. This is a single displacement reaction where zinc replaces copper.

4. **Write the Chemical Equation**: The reaction can be represented as:
\[ \text{Zn (s)} + \text{CuSO}_4 (aq) \rightarrow \text{ZnSO}_4 (aq) + \text{Cu (s)} \]
Here, zinc sulfate (ZnSO4) is formed, which is colorless, and copper is deposited as a solid.

5. **Observe the Color Change**: As the reaction proceeds, the blue color of the copper sulfate solution fades because the copper ions are being replaced by zinc ions, which do not impart any color to the solution. Thus, the solution changes from blue to colorless.

6. **Conclusion**: After some time, the color of the solution changes to colorless due to the formation of zinc sulfate.

**Final Answer**: The color changes to colorless.

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