Give the characteristic tests for the following gases
(a) CO2
Ans. When carbon dioxide is passed into lime water, the lime water turns milky. This is the characteristic test for carbon dioxide.
(b) SO2
Ans. Sulphur dioxide smells like rotten egg.
(c) O2
Ans. When a burning matchstick is brought near oxygen, the matchstick burns even more brightly. This is the characteristic test for oxygen.
(d) H2
Ans. When a burning matchstick is brought near hydrogen gas, the matchstick burns with a pop sound
