10 mL of freshly prepared iron sulphate was taken in each of four test tubes.

Strips of copper, iron, zinc and aluminium were introduced, each metal in a

different test tube. A black residue was obtained in two of them. The right pair of

metals forming the precipitates is

a
Copper and zinc.

b
Aluminum and copper.

c
Iron and aluminium.

d
Zinc and aluminium.

Question

10 mL of freshly prepared iron sulphate was taken in each of four test tubes.

Strips of copper, iron, zinc and aluminium were introduced, each metal in a

different test tube. A black residue was obtained in two of them. The right pair of

metals forming the precipitates is

a	
     Copper and zinc.

b	
     Aluminum and copper.

c	
     Iron and aluminium.

d	
     Zinc and aluminium.