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:
- NaOH + Zn → NaZnO2 + H2O
- 2NaOH + Zn → Na2ZnO2 + H2
- 2NaOH + Zn → NaZnO2 + H2
- 2NaOH + Zn → Na2ZnO2 + H2O
The Correct Option is B
Solution and Explanation
Sodium hydroxide reacts with zinc to form sodium zincate (\( \text{Na}_2\text{ZnO}_2 \)) and hydrogen gas (\( \text{H}_2 \)). The balanced reaction is:
\[2\text{NaOH} + \text{Zn} \rightarrow \text{Na}_2\text{ZnO}_2 + \text{H}_2\]
This reaction demonstrates the amphoteric nature of zinc, which reacts with alkali to release hydrogen gas.
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