When vinegar is added to a test tube containing baking soda, a gas is evolved. Identify the gas and the change involved.

Gas - nitrogen
Change - physical

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Gas - carbon dioxide
Change - chemical

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Gas - oxygen
Change - physical

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Gas - hydrogen
Change - chemical

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Solution

The correct option is B Gas - carbon dioxide
Change - chemical
Vinegar (acetic acid) reacts with baking soda (sodium bicarbonate) to form sodium acetate salt along with carbon dioxide gas and water. This can be represented as:

Acetic acid + Sodium bicarbonate $\to$ Sodium acetate + Carbon dioxide + Water

The given change is an example of a chemical change since new substance are formed in this reaction along with evolution of gas.

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