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Which substance dissolves in water to form a basic solution and also releases carbon dioxide with an acid?

Answer and explanation

Correct answer: Sodium carbonate

The governing concept is the behaviour of salts in water and their reactions with acids. Sodium carbonate dissolves to give a basic solution because carbonate ions hydrolyse water and produce hydroxide ions. With an acid, it releases carbon dioxide: Na2CO3 + 2HCl → 2NaCl + H2O + CO2. Thus option A satisfies both conditions. Sodium hydroxide is basic but does not release CO2 with acid, while sodium chloride and copper sulphate do not meet both requirements.

Related tags

Sodium CarbonateBasic SaltCarbonate ReactionAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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