Question

Consider the following cases:
(a) CaSO₄ + Al →
(b) CuSO₄ + Ca →
(c) FeSO₄ + Cu →
(d) ZnSO₄ + Mg →
The cases in which new products will form are –

• (a) and (b)
• (b) and (c)
• (c) and (d)
• (b) and (d)

Answer 1

The Correct Option is D

Step 1: Reaction Analysis:
The provided scenarios involve reactions between a metal and a metal salt. The objective is to identify which reactions will yield new substances. This determination is based on comparing the reactivity of the metals; a more reactive metal will displace a less reactive metal from its salt solution.

Scenario (a): CaSO₄ + Al
This reaction is not expected to occur. Calcium sulfate (CaSO₄) is a highly stable compound, and aluminum (Al) lacks the reactivity to displace calcium from it. Consequently, no new products will be formed.

Scenario (b): CuSO₄ + Ca
Calcium (Ca) exhibits higher reactivity than copper (Cu). It is capable of displacing copper from copper sulfate (CuSO₄), resulting in the formation of calcium sulfate (CaSO₄) and copper (Cu) as new products. Therefore, new products will be generated.

Scenario (c): FeSO₄ + Cu
Copper (Cu) is less reactive than iron (Fe). Copper cannot displace iron from iron sulfate (FeSO₄). As a result, no new products will be formed.

Scenario (d): ZnSO₄ + Mg
Magnesium (Mg) is more reactive than zinc (Zn). It can displace zinc from zinc sulfate (ZnSO₄), producing magnesium sulfate (MgSO₄) and zinc (Zn) as new products. Therefore, new products will be formed.

Step 2: Conclusion:
The reactions that will result in the formation of new products are (b) and (d).