Question

The Jammu & Kashmir State Board of School Education
9. 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.
10. Sarish took a piece of burning charcoal and collected the gas evolved in a test tube.
(a) How will she find the nature of the gas?
(b) Write down word equations of all the reactions taking place in this process.
11. One day Reeta went to a jeweller's shop with her mother. Her mother gave 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?
12. Why phosphorous is stored in water?
Extended Learning - Activities and Projects​

Answer 1

Explanation:

When dilute sulphuric acid is poured on a copper plate, copper reacts with acid to give copper sulphate and hydrogen. (b) When iron nails are placed in copper sulphate solution, displacement reaction takes place in which iron displaces copper. The blue colour turns into green.

Answer 2

Answer:

sorry

Explanation:

I don't understand sorry friend i can't answer