Exams › JEE Advanced › Chemistry
In which of the following reactions is hydrogen gas produced?
- Copper and hydrochloric acid
- Iron and dilute sulphuric acid
- Magnesium and steam
- Sodium and ethanol
Correct answer: Iron and dilute sulphuric acid
Solution
Copper does not react with HCl (it is below hydrogen in reactivity). Iron reacts with dilute H2SO4 to give FeSO4 + H2. Magnesium reacts with steam to give MgO + H2. Sodium reacts with ethanol to give sodium ethoxide + H2. Options B, C, and D all produce hydrogen.
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