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The reaction of a metal carbonate with an acid, producing a gas that turns lime water milky, is used as a test for

Question
The reaction of a metal carbonate with an acid, producing a gas that turns lime water milky, is used as a test for
Hydrogen gas
The carbonate ion
The sulphate ion
The chloride ion
Answer
The carbonate ion
Detailed Explanation
The release of CO2 (which turns lime water milky) on reaction with acid is a characteristic test for carbonates/hydrogencarbonates.
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