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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsMedium
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Magnesium gives a gas in an acidic solution, but calcium carbonate gives a different gas in the same solution. Which pair is correct?

Answer and explanation

Correct answer: Hydrogen from magnesium and carbon dioxide from calcium carbonate

A metal such as magnesium reacts with a dilute acid by displacing hydrogen: Mg + 2HCl → MgCl₂ + H₂. A carbonate reacts with an acid to produce a salt, water, and carbon dioxide: CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂. Hence magnesium gives hydrogen while calcium carbonate gives carbon dioxide, so option B is correct.

Related tags

MagnesiumCarbonatesAcid ReactionsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience
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