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A solution gives one gas with zinc and another gas with sodium carbonate. What is the correct identification of both gases?

Answer and explanation

Correct answer: Hydrogen from zinc and carbon dioxide from sodium carbonate

The governing concept is the characteristic reaction of an acid with a metal and with a carbonate. Zinc displaces hydrogen from an acid: Zn + 2HCl → ZnCl₂ + H₂. A carbonate reacts with acid to form salt, water, and carbon dioxide: Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂. Thus the first gas is hydrogen and the second is carbon dioxide. The reverse identification and oxygen or chlorine choices do not match these reactions.

Related tags

Acid ReactionsZincCarbonate Gas TestsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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