Q.8. Match the substances given in Column A with their uses given in Column B.
Q. 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.
Q. 10. Saloni 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.
Q. 11. One day Reeta went to a jeweller’s shop with her mother. Her mother gave old gold jewellery to the goldsmith to polish. The 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 of weight