Question

Which of the following pairs cannot undergo displacement reaction?
A. iron sulphate solution and magnesium
B. zinc sulphate solution and iron
C. zinc sulphate solution and calcium
D. silver nitrate solution and copper

Answer 1

Answer:

Zinc sulphate solution and calcium

Explanation:

Zinc sulphate solution and calcium cannot undergo displacement reaction.  

This is because zinc is more reactive than iron. Hence, iron cannot displace zinc from zinc sulphate solution.

HOPE THAT IT WAS HELPFUL!!!!

Answer 2

B. zinc sulphate solution and iron - no displacement

Explanation:

An element that is more reactive will displace a less reactive metal.

A. In the reactivity series, Magnesium is more reactive than iron. So Magnesium will displace iron from the iron sulphate solution.

B. In the reactivity series, iron is less reactive than Zinc. So iron will not displace zinc from the zinc sulphate solution.

C. In the reactivity series, Calcium is more reactive than Zinc. So Calcium will displace zinc from the zinc sulphate solution.

D. In the reactivity series, copper is more reactive than Silver. So Copper will displace silver from the silver nitrate solution.

Option B cannot undergo displacement. B is the answer.