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Question

What happens when CO2 is dissolved in water?

A
Carboxylic acid is formed
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B
Carbonic acid is formed
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C
Depends on the concentration of CO2
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D
Cannot be determined
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Solution

The correct option is B Carbonic acid is formed
When carbon dioxide reacts with water a weak acid is formed. A solution of carbon dioxide and water present in a flask containing an indicator sensitive to small changes of pH in the appropriate region of the pH scale, and the consequent colour changes observed and recorded.

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