Study the figure given below and name the gas which is responsible for the formation of effervescence.

Oxygen

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Carbon dioxide

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Nitrogen

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Hydrogen

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Solution

The correct option is B Carbon dioxide
Acids react with metal carbonates like calcium carbonate to form carbon dioxide gas, metal salt and water. Egg shells are made up of calcium carbonate. So, it will react with hydrochloric acid to form calcium chloride salt, carbon dioxide gas and water. This can be represented as:

Calcium carbonate + Hydrochloric acid $\to$ Calcium chloride + Carbon dioxide + Water

The evolved carbon dioxide gas produces a strong effervescence.

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Study the figure given and name the gas which is responsible for the formation of effervescence.

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