Test for gases

Question 1

Hydrogen Gas

Answer 1

Place a lighted splint at the mouth of the test tube containing the gas.
The lighted splint would extinguish with a ‘pop’ sound.

Question 2

Oxygen Gas

Answer 2

Place a glowing splint at the mouth of the test tube containing the gas.
The glowing splint would be rekindled.

Question 3

Carbon dioxide gas

Answer 3

Bubble the gas into limewater.

A white precipitate would be formed in limewater (ppt. dissolves upon further bubbling).

Question 4

Ammonia gas

Answer 4

Place a moist red litmus paper at the mouth of the test tube containing the gas.
The moist red litmus paper would turn blue.

Question 5

Sulfur dioxide

Answer 5

Place a piece of filter paper soaked with acidified potassium manganate (VII) at the mouth of the test tube.
The purple acidified potassium manganate (VII) turns from purple to colorless.

Question 6

Chlorine

Answer 6

Place a piece of moist red litmus paper at the mouth of the test tube.
The moist blue litmus paper turns red, and is bleached.