Question

You are given a solution of iron sulphate. Which of the following do you think cannot displace iron from iron sulphate?
A. magnesium
B. calcium
C. copper
D. zinc

Answer 1

Explanation:

copper because it is least reactive

Answer 2

C. copper

Explanation:

An element that is more reactive will displace a less reactive metal. The given solution is iron sulphate. So an element that is less reactive than iron cannot displace iron from the iron sulphate. From the given list, copper is less reactive than iron. So copper cannot displace iron from iron sulphate.

Zinc is more reactive than iron, so zinc will replace iron from iron sulphate to form zinc sulphate.

Option C is the answer.