Answer:
The
characteristic test for
(i) Carbon dioxide (CO2) gas turns lime water
milky when passed through it due to the formation of insoluble calcium
carbonate.
(ii) Sulphur dioxide (SO2) gas when passed
through acidic potassium permanganate solution (purple in colour) turns it colourless
because SO2 is a strong reducing agent.
(iii) The evolution of oxygen (O2) 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.
(iv)
Hydrogen (H2) gas burns with a pop sound when a burning candle is brought
near it.
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