Give the characteristic tests for the following gases: [5 MARKS]
(a) CO2
(b) SO2
(c) O2
(d) H2
(e) N2
Give the characteristic tests for the following gases: [5 MARKS]
(a) CO2
(b) SO2
(c) O2
(d) H2
(e) N2
Each point: 1 Mark
(a) Carbon dioxide turns lime water milky as it forms calcium carbonate with lime water.
(b) The smell of sulphur dioxide gas is like burning of sulphur. Sulphur dioxide also turns moist litmus paper from blue to red.
(c) When a burnt candle or match stick is brought near the oxygen gas, it starts burning brightly. This is the characteristic test for oxygen gas.
(d) When a burnt candle or match sticks is brought near the hydrogen gas, it burns with pop sound, which is the characteristic test for hydrogen gas.
(e) If a flaming wooden splint or piece of paper is inserted into a tube of nitrogen gas, the flame immediately goes out, and this is a characteristic test for nitrogen gas.
Each point: 1 Mark
(a) Carbon dioxide turns lime water milky as it forms calcium carbonate with lime water.
(b) The smell of sulphur dioxide gas is like burning of sulphur. Sulphur dioxide also turns moist litmus paper from blue to red.
(c) When a burnt candle or match stick is brought near the oxygen gas, it starts burning brightly. This is the characteristic test for oxygen gas.
(d) When a burnt candle or match sticks is brought near the hydrogen gas, it burns with pop sound, which is the characteristic test for hydrogen gas.
(e) If a flaming wooden splint or piece of paper is inserted into a tube of nitrogen gas, the flame immediately goes out, and this is a characteristic test for nitrogen gas.
