Question

When iron nails are kept in copper sulphate solution for 2-3 hours and then taken out and washed. The colour of iron nails will be
a. Grey
b. white
c. black
d. Brown​

Answer 1

Justify your answer. Answer: When an iron nail immersed in the solution of copper sulphate than iron displaces copper from the solution of copper sulphate because iron is more reactive than copper. Therefore copper sulphate solution colour changes from blue to pale green.

Answer 2

Answer:

(d) reddish brown or rust colour

:)

Explanation:

as copper displaces iron.