Question

Name the gas evolved when dilute HCI reacts with sodium hydrogen carbonate. How is it recognised?
How will you test for a gas which is liberated when hydrochloric acid reacts with an active metal?
On adding dilute hydrochloric acid to copper oxide powder, the solution formed is blue-green. Predict the new
compound formed which imparts biue-green colour to the solution.

Answer 1

Answer:

Gas evolved is carbon dioxide.... recognized when passed through lime water it turns milky...

Hydrogen evolved...so it's pop sound test...

The new compound is cupric chloride(CuCl2)....

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Answer 2

Answer:

1) Carbon dioxide

2) Hydrogen

2) copper chloride and water

Explanation:

1) we add calcium carbonate and it turns milky by proving the presence of co2

2) by bringing a matchstick near the mouth of the test tube and we hear a pop sound indicating the hydrogen gas

3) copper doesn't react but copper oxide reacts to form a new compound copper chloride and water

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