. Giving a line answer, briefly explain why dilute H2SO4 or HCl with Zinc or magnesium is used to prepare hydrogen gas and not the concentrated acids.
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It is because Zn and Mg are reactive metals and when they react with conc. H2SO4 they forms ZnSO4 and MgSO4 salts but with dil. H2SO4 they forms H2 due to the metallic character.
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