Which of the following metals liberates H2 on reaction with steam but not with cold water?
- Pb
- Na
- Fe
- K
The Correct Option is C
Solution and Explanation
Lead (Pb) does not react with water, either cold or hot, under normal conditions.
Sodium (Na) and Potassium (K) react vigorously with both cold water and steam, producing hydrogen gas.
Iron (Fe) reacts with steam but not with cold water. This is because iron reacts with steam at high temperatures to form iron oxide and hydrogen gas: \[ \text{Fe} + \text{H}_2\text{O (steam)} \rightarrow \text{Fe}_3\text{O}_4 + \text{H}_2. \] However, it does not react significantly with cold water. Thus, the metal that liberates \( \text{H}_2 \) on reaction with steam but not with cold water is Iron (Fe).
The correct option is (C): \(Fe\)
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