Which of the following metal liberates H2 gas on reaction with NaOH?
- Zn
- Ca
- Mg
- Na
The Correct Option is A
Solution and Explanation
When a metal reacts with sodium hydroxide (NaOH), hydrogen gas (\( \text{H}_2 \)) is released. Among the given metals:
Zinc (Zn) reacts with sodium hydroxide to form sodium zincate and liberates hydrogen gas: \[ \text{Zn} + 2\text{NaOH} \rightarrow \text{Na}_2\text{ZnO}_2 + \text{H}_2. \]
Calcium (Ca) and Magnesium (Mg) also react with NaOH but they are less commonly referred to in typical reactions where hydrogen gas is liberally produced in similar contexts.
Sodium (Na) is an alkali metal and reacts very vigorously with water to produce hydrogen gas, but in this case, Na reacts with water, not NaOH specifically.
Thus, the correct answer is Zinc (Zn).The correct option is (A): Zn
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