Assertion (A): The colour of copper sulphate solution changes when a piece of zinc is dropped in it
Reason (R): Copper is more reactive than zinc.

Options

A. Both A and R are true and R is the correct explanation of A.
B. Both A and Rare true and R is the not the correct explanation of A
C. A is true but R is false
D. A is true but R is false

Explanation

To solve the assertion and reason question, we will break it down step by step.

### Step 1: Understand the Assertion
The assertion states that "The colour of copper sulphate solution changes when a piece of zinc is dropped in it."

**Explanation**: When zinc is added to a blue copper sulfate solution, the blue color changes because zinc displaces copper from the copper sulfate solution.

### Step 2: Understand the Reason
The reason given is "Copper is more reactive than zinc."

**Explanation**: This statement is incorrect. In the reactivity series of metals, zinc is actually more reactive than copper. This means that zinc can displace copper from its compounds, such as copper sulfate.

### Step 3: Analyze the Reaction
When zinc is added to copper sulfate (CuSO4), the following reaction occurs:
\[ \text{Zn} + \text{CuSO}_4 \rightarrow \text{ZnSO}_4 + \text{Cu} \]

**Explanation**: In this reaction, zinc displaces copper from copper sulfate, resulting in the formation of zinc sulfate (which is colorless) and copper (which may appear as a reddish-brown solid). This reaction is what causes the blue color of the copper sulfate solution to disappear.

### Step 4: Conclusion
- The assertion is **true** because the color of the copper sulfate solution does change when zinc is added.
- The reason is **false** because copper is not more reactive than zinc; zinc is more reactive.

### Final Answer
- Assertion (A) is true.
- Reason (R) is false.

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