Question

which all the metal pieces out of Zn, Cu and Ag would you use to prepare hydrogen gas from dilute hydrochloric acid in labortary and why ?

Answer 1

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zinc metal is above the hydrogen but Cu and Ag are below the hydrogen in reactivity series hence Zn can displace hydrogen and produce H2 gas with dil. HCl but Ag cannot .

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Answer 2

Hello mate

here's your answer

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Displacement reaction means when the high-reactive metal replaces the low reactive metal in a chemical reaction.

Accordingly Zinc is above the hydrogen while Cu and ag are below the hydrogen in the reactivity series hence Zn can displace hydrogen and produce H2 gas with dilute hydrochloric acid.

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Thanks