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Question

Which of the following gas is released when an acid reacts with metal carbonate?

A
Hydrogen
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B
Oxygen
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C
Nitrogen
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D
Carbon dioxide
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Solution

The correct option is D Carbon dioxide
When an acid reacts with a metal carbonate, a salt, water and carbon dioxide are produced:

Acid + Metal carbonate → Salt + Water + Carbon dioxide

The carbon dioxide gas causes bubbling during the reaction, which is observed as fizzing. It can be detected by passing the gas through limewater, as it turns limewater milky.

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