Question

give a chemical test to distinguish between
a. hydrogen and oxygen
b. carbon dioxide and sulphur dioxide

Answer 1

a hydrogen burns with pop sound oxygen absorbed in colourless alkaline pyrogallo solution which turns Brown
b. carbon dioxide on passes through lime water it turns limewater milky but has no effect on acidified K2 Cr2 O7 solution
Sulphur dioxide turns acidified potassium dichromate from Orange to clear green

Answer 2

hey IT is your answer...