Foundation
Chemistry Foundation
Chemical Properties of Metals and Non Metals
Question
Which of the following pair will not produce dihydrogen gas ?
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Solution
Metals produce dihydrogen gas (H₂) when reacting with acids or water only if they are above hydrogen in the reactivity series. Copper (Cu) is below hydrogen and thus cannot displace it from dilute HCl. The reaction does not occur: Cu + HCl → No reaction.
Other pairs react: Na + H₂O → NaOH + H₂; Fe + H₂SO₄ → FeSO₄ + H₂; Mg + H₂O(steam) → MgO + H₂.
Final Answer: Cu + HCl (dil)