Question

Iron nails were dipped in an aqueous solution of copper sulphate. After about 30 minutes, it
was observed that the colour of the solution changed from
(A) Colourless to light green
(B) Blue to light green
(C) Blue to colourless
(D) Green to blue
(CBSE 2011, 1 mark)​

Answer 1

Answer:

Blue to  Light Green

Explanation:

Iron is more reactive than copper, therefore it can displace copper from its salts (here, copper sulphate).

The displacement reaction taking place can e written as :

Fe + CuSO4(aq) == FeSO4 + Cu

Iron + Copper Sulphate(aq) == Iron sulphate + copper

Now, enough basics, directly to question…

A fter 30 minutes:

1) The initial blue colour of copper sulphate solution is changed to light green colour of iron sulphate.

2) The initial silver colour of iron nail is changed to reddish-brown colour due to coating of copper metal on the nail.

Answer 2

Explanation:

Explanation:it Turns From Blue to Light Green Due to the Displacement reaction...here Iron Displaces Copper from copper sulphate solution