Question

Column A 1. The catalyst used in the preparation of oxygen 2. The necessary condition for rusting to occur 3. Carbon dioxide was discovered by burning material rich in carbon 4. The amount of water vapour in air 5. It turns moist blue litmus red Column B (a) Helmont (b) Carbon dioxide (C) Humidity (d) Moisture and air (e) Manganese dioxide​

Answer 1

Answer:

1. The catalyst used in the preparation of oxygen -

(e)Manganese dioxide

2. The necessary condition for rusting to occur- (d) Moisture and air

3.Carbon dioxide was discovered by burning material rich in carbon- (a) Helmont

4.The amount of water vapour in air- (C) Humidity

5. It turns moist blue litmus red - (b) Carbon dioxide.