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Question

Which of the following is an acid-base reaction and releases a gas that turns lime water milky?

A
CaSO4 + HCl
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B
CH3COOH + HCl
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C
NaHCO3 + HCl
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D
NaOH + HCl
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Solution

The correct option is C NaHCO3 + HCl
NaHCO3 is basic and reacts with acid to form a salt, water and carbon dioxide. Carbon dioxide gas turns lime water milky.

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