Which of the following reactions will be possible?

Correct option is B

The correct answer is (b) $$CuSO_4+Ca→CaSO_4+Cu$$

This question is based on the reactivity series of metals. A more reactive metal can displace a less reactive metal from its compound. Let’s analyze the given reactions:

1. CuSO₄ + Ca → CaSO₄ + Cu:
• Calcium (Ca) is higher than Copper (Cu) in the reactivity series, meaning it is more reactive.
• Therefore, calcium displaces copper from copper sulfate, forming calcium sulfate and copper.
• This reaction is possible.
2. MgCl₂ + Cu → CuCl₂ + Mg:
• Copper (Cu) is less reactive than magnesium (Mg).
• Therefore, copper cannot displace magnesium from magnesium chloride.
• This reaction is not possible.
3. ZnSO₄ + Fe → FeSO₄ + Zn:
• Iron (Fe) is less reactive than zinc (Zn).
• Therefore, iron cannot displace zinc from zinc sulfate.
• This reaction is not possible.
4. Al₂(SO₄)₃ + Pb → PbSO₄ + Al:
• Lead (Pb) is less reactive than aluminum (Al).
• Therefore, lead cannot displace aluminum from aluminum sulfate.
• This reaction is not possible.

Thus, only the first reaction (CuSO₄ + Ca → CaSO₄ + Cu) is possible based on the reactivity series.