Identify the statement which is not correct regarding `CuSO_4`?

Options

A. It reacts with KI to give iodine
B. It reacts with KCl to give `Cu_2Cl_2`
C. It reacts with `NaOH` and glucose to give `Cu_2O`
D. It gives `CuO` on stron heating in air

Explanation

To identify the statement which is not correct regarding CuSO₄, let's analyze each of the provided options step by step.

### Step 1: Analyze the first statement
**Statement:** CuSO₄ reacts with KI to give iodine.

**Reaction:**
When CuSO₄ reacts with KI, the reaction can be represented as:
\[ 2 \text{CuSO}_4 + 4 \text{KI} \rightarrow 2 \text{CuI} + \text{I}_2 + 2 \text{K}_2\text{SO}_4 \]
This reaction produces iodine (I₂) along with copper(I) iodide (CuI) and potassium sulfate (K₂SO₄).

**Conclusion:** This statement is correct.

### Step 2: Analyze the second statement
**Statement:** CuSO₄ reacts with KCl to give Cu₂Cl₂.

**Reaction:**
When CuSO₄ reacts with KCl, the reaction is:
\[ \text{CuSO}_4 + 2 \text{KCl} \rightarrow \text{CuCl}_2 + \text{K}_2\text{SO}_4 \]
This reaction produces copper(II) chloride (CuCl₂) and potassium sulfate (K₂SO₄).

**Conclusion:** This statement is incorrect because it states that CuSO₄ produces Cu₂Cl₂, which is not the case.

### Step 3: Analyze the third statement
**Statement:** CuSO₄ reacts with NaOH and glucose to give Cu₂O.

**Reaction:**
The reaction of CuSO₄ with NaOH and glucose can be represented as:
\[ 2 \text{CuSO}_4 + 4 \text{NaOH} + \text{C}_6\text{H}_{12}\text{O}_6 \rightarrow \text{Cu}_2\text{Na}_2\text{SO}_4 + \text{C}_6\text{H}_{12}\text{O}_7 + \text{H}_2\text{O} \]
While the formation of Cu₂O is not explicitly shown in this equation, it is known that copper(II) ions can be reduced to copper(I) oxide (Cu₂O) in the presence of glucose under certain conditions.

**Conclusion:** This statement is correct.

### Step 4: Analyze the fourth statement
**Statement:** CuSO₄ gives Cu when heated strongly.

**Reaction:**
When CuSO₄ is heated strongly, it decomposes as follows:
\[ \text{CuSO}_4 \xrightarrow{\text{heat}} \text{CuO} + \text{SO}_3 \]
This reaction produces copper(II) oxide (CuO) and sulfur trioxide (SO₃). The statement implies that elemental copper (Cu) is produced, which is not correct.

**Conclusion:** This statement is also correct in the context that it does not produce elemental copper directly.

### Final Conclusion
The statement that is not correct regarding CuSO₄ is the second statement: "It reacts with KCl to give Cu₂Cl₂."