Question

Reaction between which two substances is not feasible
A. CuSO. - Zn
B.ZnSO4 + Cu
C.FeSO. - Zn
D. 2HCI + Ca​

Answer 1

The following reaction of the two substance which is not feasible is

"B".ZnSO4 + Cu

Answer 2

There are some mistakes in the formulas of the compounds given in the options. The options must be written as:

A. $\[CuS{O_4} + Zn\]$

B. $\[ZnS{O_4} + Cu\]$

C. $\[FeS{O_4} + Zn\]$

D. $\[2HCl + Ca\]$

The two substances between which the reaction is not feasible are $\[ZnS{O_4} + Cu\]$. Thus, the correct option is B.

Explanation:

• According to the reactivity series, zinc lies above copper and iron. It means zinc is more reactive than copper and iron.
• Therefore, it can displace copper and iron from their salts and the reactions are feasible.

       $\[CuS{O_4} + Zn \to ZnS{O_4} + Cu\]$

       $\[FeS{O_4} + Zn \to ZnS{O_4} + Fe\]$

• Calcium lies above hydrogen in the reactivity series. It means calcium is more reactive than hydrogen.
• Therefore, it can displace hydrogen to form calcium chloride and hydrogen gas. The reaction between HCl and Ca is feasible.

        $\[2HCl + Ca \to CaC{l_2} + {H_2}\]$

• As copper is less reactive than zinc. It cannot displace zinc from its salt. Therefore, the reaction between zinc sulphate and copper is not feasible.

        $\[ZnS{O_4} + Cu \to \times \]$