Question:
Which metal does not react with water to produce hydrogen gas?
Which metal does not react with water to produce hydrogen gas?
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Compare the reactivity series positions of these four metals.
Updated On: Jul 16, 2026
- Cadmium
- Lithium
- Potassium
- Sodium
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The Correct Option is A
Solution and Explanation
Step 1: Recall the reactivity series.
Metals placed high in the reactivity series, such as potassium, sodium and lithium, are very reactive towards water.
Step 2: Check each metal's behaviour.
Potassium and sodium react violently with cold water, releasing hydrogen gas and enough heat to ignite it. Lithium reacts with cold water in a steady, less violent way, also releasing hydrogen.
Step 3: Look at cadmium.
Cadmium lies much lower in the reactivity series. It does not react with cold or hot water and needs strong acids to show any reaction, so it produces no hydrogen from water.
Final Answer: A) Cadmium.
Metals placed high in the reactivity series, such as potassium, sodium and lithium, are very reactive towards water.
Step 2: Check each metal's behaviour.
Potassium and sodium react violently with cold water, releasing hydrogen gas and enough heat to ignite it. Lithium reacts with cold water in a steady, less violent way, also releasing hydrogen.
Step 3: Look at cadmium.
Cadmium lies much lower in the reactivity series. It does not react with cold or hot water and needs strong acids to show any reaction, so it produces no hydrogen from water.
Final Answer: A) Cadmium.
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