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  • Give the characteristic tests for the following gases

Give the characteristic tests for the following gases

(a) CO_2

(b) SO_2

(c) O_2

(d) H_2

Answers (1)

(a) Pass CO_2 into limewater which will turn limewater milky. This is the confirmation test for the presence of carbon-dioxide.

Ca(OH)_2 (aq) + CO_2 \rightarrow CaCO_3 (White color)+ H_2O

(b) 1) Smell is the characteristic feature of SO_2 which smells like rotten egg.

      2) Sulphur dioxide gas turns moist litmus paper from blur to red as sulphur dioxide is acidic in nature.

      3) Sulphur dioxide gas turns acidified potassium dichromate solution from orange to green (Conformation Test)

(c) Test for oxygen involves burning of match stick near oxygen. It makes the match stick burn even more brightly.

(d) When burning matchstick is brought near H_2 gas, the flame burns with the pop sound. This is the test to confirm Hydrogen gas.

 

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