Gases Test/halogens

Question 1

Ammonia gas NH3

Answer 1

Turns damp red litmus paper blue

Question 2

CO2 carbon dioxide

Answer 2

Gives a white ppt with limewater (CaOH2) . Ppt dissolved in excess CO2
Ca(OH)2 + CO2 > CaCO3 + H20
EXCESS CO2 + water >H2CO3 (carbonic acid)
CaCO3 + H2CO3 > CaHCO3 (soluble in water)

Question 3

Chlorine Cl2

Answer 3

Bleaches damp litmus paper

Question 4

Hydrogen

Answer 4

Extinguishes lighted splint with a pop

Question 5

Oxygen

Answer 5

Relights glowing splint

Question 6

Sulfur dioxide SO2

Answer 6

Turns aq acidified KMnO4 from purple to colourless

Question 7

Color of chlorine (gas and aq)

Answer 7

Greenish yellow gas

Pale yellow as aq solution

Question 8

Bromine Br2 colour (aq and gas)

Answer 8

Reddish brown gas

Orange aq solution

Question 9

Iodine I2 (gas and aq Color)

Answer 9

Black solid or purple gas

Brown aq solution