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Question

Two reactants in a flask at room temperature are producing bubbles of a gas that turn limewater milky. The reactants could be ________.

This question was previously asked in
CDS I 2018 Elementary Mathematics Previous Year Paper (04-Feb-2018)
The correct answer is

Magnesium carbonate and hydrochloric acid

Magnesium carbonate and hydrochloric acid Magnesium carbonate ( MgCO_3 ) is a metal carbonate, and hydrochloric acid ( HCl ) is an acid. Therefore, the reactants that could be in the flask are magnesium carbonate and hydrochloric acid.

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