A zinc plate was put into a solution of copper sulphate kept in a glass tumbler. It was found that a blue colour of the solution gets fader and fader with the passage of time . After a few days when zinc plate was taken out, a no. of holes were found .

(i) state the reason for the change in the plate

Open in App

Solution

Zinc is more reactive than copper and so it had displaced copped from copper sulphate solution thus the colour of the solution got fader and fader with time. Zinc displaced copper and formed zinc sulphate so, when the zinc plate was removed it had holes in it.

copper sulphate + zinc $⟶$ zinc sulphate + copper
$C u S O_{4} + Z n ⟶ Z n S O_{4} + C u$

Suggest Corrections

Similar questions

Q. Ravi placed a zinc plate in a glass container having a blue coloured solution of a metal sulphate MSO₄ for a considerable time. He found that the blue colour of solution got lighter and lighter, and finally the solution became colourless. A red-brown deposit was also formed on the zinc plate.
(a) Which metal, zinc or M, occurs lower in the reactivity series?
(b) Name the substance which forms colourless solution.

Q. A piece granulated zinc was dropped into copper sulphate solution. After sometime the colour of the solution changed from blue to colourless. Why?

A cleaned aluminium foil was placed in an aqueous solution of zinc sulphate. When the aluminium foil was taken out of the zinc sulphate solution after 15 minutes, its surface was found to be coated with a silvery grey deposit. From the above observation, it can be concluded that:

Q. Brain Nurtures
A solution of

C u S O_{4}

was kept in an iron pot. After a few days, the iron pot was found to have a number of holes in it. How were these holes formed?

Join BYJU'S Learning Program