Question

what happened when acids react with metal carbonate or hydrogen carbonate gas is evolved which extinguish the burning candle and how can we check the presence of this gas​

Answer 1

Answer:

Answer: When calcium carbonate reacts with hydrochloric acid, it produces carbon dioxide gas with effervescence. Carbon dioxide used as fire extinguisher. Hence, it extinguishes a burning candle. Therefore, the metal compound A is calcium carbonate.

Explanation:

hope it helps you

Answer 2

Answer :

The gas evolved is hydrogen.

To check it's presence we take a burning candle across the gas evolved if the candle extinguishes with a a pop up sound than the gas evolved is hydrogen.