Two reactants in a flask at room temperature are producing b

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M: +1.00/-0.33

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

[CDS-II 2018 General Awareness(PYSP)]

A zinc and hydrochloric acid

B magnesium carbonate and hydrochloric acid

C methane and oxygen

D copper and dilute hydrochloric acid