Question:
What happens when
(a) Dilute sulphuric acid is poured on a copper plate?
(b) Iron nails are placed in copper sulphate solution?
Write word equations of the reactions involved.
Answer:
(a) When dilute sulphuric acid is poured on a copper plate, the
copper metal reacts with sulphuric acid to liberate hydrogen gas.
Copper (Cu) + Sulphuric acid (H,S04) -* Copper sulphate (CuS04) + Hydrogen gas (H:)
(b) Iron being more reactive displaces copper from copper sulphate
solution. In this reaction, the blue colour of copper sulphate fades
and there is deposition of copper on the iron nail.
Iron (Fe) +Copper sulphate (CuS04) -ยป Iron sulphate (FeS04) +Copper (Cu)
Q 5.
One day Reeta went to a jeweller's shop with her mother. Her
mother gave an old gold jewellery to the goldsmith to polish. Next
day when they brought the jewellery back, they found that there was
a slight loss in its weight. Can you suggest a reason for the loss in
weight?