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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsMedium
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Which gas can be released when sodium hydroxide reacts with zinc?

Answer and explanation

Correct answer: Hydrogen

Zinc is amphoteric, so it can react with a strong base such as sodium hydroxide. In aqueous solution, zinc forms a soluble zincate species while water is reduced and hydrogen gas is evolved; a simplified equation is Zn + 2NaOH + 2H2O → Na2[Zn(OH)4] + H2. Thus hydrogen is correct, not oxygen, carbon dioxide, or chlorine.

Related tags

ZincSodium HydroxideHydrogenAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience
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10 more MCQs
  1. 1What type of substance turns blue litmus paper red?
  2. 2What type of substance turns red litmus paper blue?
  3. 3Which of the following substances acts as a natural indicator?
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  7. 7At 25°C, a solution with a pH greater than 7 is of which nature?
  8. 8A student dips red litmus paper into a soap solution. What change will occur in the red litmus paper?
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