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Which one of the following pairs of substances on reaction will not evolve H2 gas?

1. Iron and H2SO4 (aqueous)
2. Tin and steam
3. Copper and HCl (aqueous)
4. Sodium and ethyl alcohol

Correct answer: Copper and HCl (aqueous)

Solution

Copper does not react with HCl (aqueous) because it is less reactive than hydrogen and cannot displace it from the acid to evolve H2 gas.

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