Question:
Which of the following metal forms hydrogen gas with cold water?
Which of the following metal forms hydrogen gas with cold water?
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Alkali metals such as potassium and sodium react vigorously with cold water to produce hydrogen gas and metal hydroxides.
Updated On: Nov 5, 2025
- Copper
- Gold
- Potassium
- Aluminium
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The Correct Option is C
Solution and Explanation
Potassium reacts vigorously with cold water to produce hydrogen gas and potassium hydroxide. This is a typical reaction of alkali metals with water. The reaction can be represented as:
\[
2K + 2H_2O \rightarrow 2KOH + H_2
\]
Copper and gold do not react with cold water, and aluminium reacts very slowly in cold water but reacts readily in hot water.
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