Question

Give the characteristic test of the following gases co2 so2 o2 h2

Answer 1

Carbon dioxide (C02) gas turns lime water milkv when passed through it due to the formation of insoluble calcium carbonate.


Sulphur dioxide (S02) gas when passed through acidic potassium permanganate solution (purple in colour) turns it colourless because S02 is a strong reducing agent.


The evolution of oxygen (02) gas during a reaction can be confirmed by bringing a burning candle near the mouth of the test tube containing the reaction mixture. The intensity of the flame increases because oxygen supports burning.

Hydrogen (H2) gas burns with a pop sound when a burning candle is brought near it.

Answer 2

for co2 use lime water test

so2 has burning smell of sulphur

O2 can be tested by taking candle near it flame start glowing with more intensity

H2 give pop up sound when heat