Which one of the following pairs of substances on reaction will not evolve H2 gas?A.Iron and steamB.Iron and H2SO4 (aqueous)C.Copper and HCl (aqueous)D.Sodium and ethyl alcohol
Question
Which one of the following pairs of substances on reaction will not evolve H2 gas?A.Iron and steamB.Iron and H2SO4 (aqueous)C.Copper and HCl (aqueous)D.Sodium and ethyl alcohol
Solution
The pair that will not evolve H2 gas when reacted is Copper and HCl (aqueous). This is because copper is less reactive than hydrogen and cannot displace hydrogen from its compounds. Therefore, no hydrogen gas will be evolved when copper reacts with hydrochloric acid.
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