Gas Identification

Question 1

Hydrogen

Answer 1

Colourless and odourless

Insert lighted splint at mouth of test tube
Lighted splint should extinguish with a pop sound

Question 2

Oxygen

Answer 2

Colourless and odourless

Insert glowing splint into test tube
Glowing splint is rekindled

Question 3

Carbon dioxide

Answer 3

Colourless and odourless

Bubble gas through limewater
White precipitate should form

Question 4

Ammonia

Answer 4

Colourless gas with pungent smell

Place a piece of moist red litmus paper at the mouth of test tube
The moist red litmus paper should turn blue

Question 5

Sulfur dioxide

Answer 5

Colourless gas with pungent smell

Place piece of filter paper soaked with acidified potassium manganate (VII) at mouth of test tube
It will turn from purple to colourless

Question 6

Chlorine

Answer 6

Pale green yellow gas with pungent smell

Place piece of moist blue litmus at mouth of test tube
The moist blue litmus paper turns red then is bleached white

Question 7

Hydrogen chloride

Answer 7

Colourless and pungent

Damp blue litmus paper turns red
White fumes of ammonium chloride is observed with glass rod dipped in aqueous ammonia is brought near gas

Question 8

Water vapour

Answer 8

Colourless and odourless

Anhydrous copper (II) sulfate paper changes from white to blue 
Anhydrous cobalt (II) chloride paper changes from blue to pink