Question

What happens when- (Mention chemical equations also)
a) Aluminium foil is treated with dil.Hydrochloric acid. b) Sulphur dioxide dissolve in water.
c) Iron nails are placed in copper sulphate solution.
d) Conc.Sulphuric acid is poured on a Copper plate.
e) Copper vessel is exposed to moist air for long time

Answer 1

Explanation:

Cu do not react with dilute sulphuric acid as it comes behind hydrogen in the reactivity series. But with concentrated H

2

SO

4

it reacts to form CuSO

4

and SO

2

is evolved.

Cu+2H

2

SO

4

(conc)→CuSO

4

+SO

2

+2H

2

O

b) Since Fe is more reactive than Cu. It will displace Cu from CuSO

4

and form FeSO

4

. A color change of blue to light green will occur.

Fe+CuSO

4

→FeSO

4

+Cu