Question:

When 2 mL of sodium hydroxide solution is added to a few pieces of granulated zinc in a test tube and then warmed, the reaction that occurs can be written in the form of a balanced chemical equation as:

Updated On: Dec 11, 2024
  • NaOH + Zn → NaZnO2 + H2O
  • 2NaOH + Zn → Na2ZnO2 + H2
  • 2NaOH + Zn → NaZnO2 + H2
  • 2NaOH + Zn → Na2ZnO2 + H2O
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The Correct Option is B

Solution and Explanation

Sodium hydroxide reacts with zinc to form sodium zincate (Na2ZnO2 \text{Na}_2\text{ZnO}_2 ) and hydrogen gas (H2 \text{H}_2 ). The balanced reaction is:
2NaOH+ZnNa2ZnO2+H22\text{NaOH} + \text{Zn} \rightarrow \text{Na}_2\text{ZnO}_2 + \text{H}_2
This reaction demonstrates the amphoteric nature of zinc, which reacts with alkali to release hydrogen gas.

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