Question

Which metal do not displace H2 from cold water ?
Answers are more than 2...

Answer 1

Hydrogen gas is always created when metals mix with acids because it is the first element and it is always created in a chemical reaction. hope i helped ya! . A BETTER ANSWER . You are assuming that all acids have hydrogen ions to donate. This is not the most rigorous definition for an acid but for this question it will do.. for example some acids are H 2 SO 4 , HCL, HF, H 2 CO 3 . What in effect happens is that the neutral metal and the ionic hydrogen trade states. The metal becomes ionic and the hydrogen become elemental (I don't want to say metallic for hydrogen even if the term does fit in this context.). Ca (s) + H 2 SO 4 -> CaSO 4 +H2 (g)

Answer 2

since gold .. alluminium.. silver are less reactive metals which can't displace hydrogen from it's acidic solution