Question

Why does not Platinum liberate hydrogen on reacting with dilute hydrochloric acid?​

Answer 1

Answer:

Platinum is placed below hydrogen in the reactivity series as we know. Therefore, it cannot lose electrons to hydrogen ions of the acid called dilute hydrochloric acid. Hydrogen gas is not evolved when Platinum reacts with dilute hydrochloric acid.

Answer 2

Simply, in order to produce hydrogen from acid, a metal has to be above from the hydrogen in the electrochemical series(metal has to react more vigorously or more reactive). So the metal like gold, silver, copper ,platinum etc don't produce hydrogen with acids as they can't able to replace the hydrogen in the reaction.