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If a solution has pH less than 7 and releases gas with a metal carbonate, what could the solution be?

Answer and explanation

Correct answer: Acidic solution

The governing concept is the characteristic reaction of acids with carbonates. A pH below 7 indicates that the solution is acidic, meaning it has a higher hydrogen-ion concentration than a neutral solution. Acids react with metal carbonates to form a salt, water and carbon dioxide gas, causing effervescence. Therefore option A is correct; a base or neutral solution does not give this combined evidence, and solid salt is not a solution.

Related tags

AcidsPhCarbonate ReactionCarbon DioxideBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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