question_answer

Which one of the chemical reactions is incorrect?

(i) \[Fe\,S{{O}_{4}}+Zn\to Zn\,S{{O}_{4}}+Fe\]

(ii) \[Zn\,S{{O}_{4}}+Fe\to Fe\,S{{O}_{4}}+Zn\]

(iii) \[2Au+2HCl\to 2Au\,\,Cl+{{H}_{2}}\]

(iv) \[Mg+Cu\,S{{O}_{4}}\to Mg\,S{{O}_{4}}+Cu\]

A) (i) and (ii)                      

B) (ii) and (iii)

C) (iii) and (iv)                   

D) (i) and (iv)

E) None of these