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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsMedium
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An acid reacts with zinc to give one gas and with sodium carbonate to give another gas. What are the correct identities of the two gases?

Answer and explanation

Correct answer: Hydrogen from zinc and carbon dioxide from carbonate

The governing concept is the characteristic reaction of acids with metals and carbonates. Zinc, a sufficiently reactive metal, displaces hydrogen from a dilute acid: Zn + 2HCl → ZnCl₂ + H₂. Sodium carbonate reacts with an acid to produce a salt, water, and carbon dioxide: Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂. Therefore the gases are hydrogen and carbon dioxide respectively. Option A is correct; the reverse pairing in B is wrong.

Related tags

Acid ReactionsZincCarbonateAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience
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