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.
11. 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?
PLEASE ANSWER THESE TWO QUESTION CLASS 8
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10) a) nature of the gas is acidic. b) Charcoal + Ocygen (gives) Carbon dioxide
Explanation:
a) add some water in the test tube in which gas is collected. Now, cover the test tube. shake it well. test the solution with blue litmus and red litmus. Blue litmus turned red. b) Charcoal when reacts with oxygen forms Carbon dioxide. 11) to polish a gold ornament, it is dipped in an acid ( called Aqua Regia). The outer layer of gold dissolves in the acid and the inner shiny layer is visible. Because of loss of upper layer of jewellery, its weight is reduced
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