Question:
The element producing hydrogen gas with cold water is:
The element producing hydrogen gas with cold water is:
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Highly reactive metals like potassium, sodium, and calcium react with cold water to produce hydrogen gas.
Updated On: Nov 5, 2025
- Au
- Ag
- K
- Cu
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The Correct Option is C
Solution and Explanation
Potassium (K) is a highly reactive alkali metal that reacts vigorously with cold water to form potassium hydroxide (KOH) and hydrogen gas (Hâ‚‚). This reaction releases heat and produces bubbles of hydrogen gas.
\[
2K + 2H_2O \rightarrow 2KOH + H_2
\]
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