Question

2. The gas evolved when a dilute acid is added to chalk ſlimestone).
3. Two non-metals which react explosively when brought in close contact
4. Two gases which react under pressure in presence of a catalyst at elevated
temperatures to give a gaseous product.
5. A catalyst which increases the rate of a chemical reaction.​

Answer 1

Answer:

1. carbon dioxide gas
2. Like all metal carbonates, calcium carbonate reacts with acidic solutions to produce carbon dioxide gas. It is this reaction that is responsible for limestone fizzing when dilute hydrochloric acid is placed on its surface