Question

WHAT HAPPENS WHEN -
A] iron nails are placed in copper sulphate solution ?
B] a piece of copper metal is placed in a test tube containing dilute hydrochloric acid .

WRITE CHEMICAL EQUATION FOR THE INVOLED

Answer 1

A. Since Iron is more reactive than copper, it displaces copper from its sulphate solution. The chemical equation for the reaction is-
Fe(II) + CuS$O_{4}$ = FeS$O_{4}$ + Cu 

B. Single displacement reaction will occur.
Cu + 2HCl = CuC$l_{2}$ + $H_{2}$

Hope this answer helps!