Question:
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.
Answer:
(a) Add a few drops of water in the test tube containing gas. Now,
cover the test tube and shake it well. After shaking, test the solution
with blue litmus and red litmus. It will turn blue litmus red. Thus, the
gas is acidic in nature.
(b) Charcoal reacts with oxvsen to form carbon dioxide gas.
c + o2 —> co2
Carbon
from
charcoal,+Oxygen->(Carbon dioxide)
Carbon dioxide reacts with water to form carbonic acid, which turns
blue litmus paper red.
CO2 + H20 -----> H2CO3
(Carbon dioxide) (Water) (Carbonic acid) (Turns blue litmus red)
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?