Question

metals replace hydrogen from acids why

Answer 1

When a metal replaces the hydrogen in an acid, it forms a compound in which the metal is positively charged (a cation) and the remainder of the acid molecule is negatively charged (an anion). Nonmetals (apart from hydrogen, which is really more of a semi-metal) do not readily form positive ions (that is one of the features that distinguish metals and nonmetals) and two negative ions cannot form a compound.

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Answer 2

Metals have tendency to lose electrons.
These electrons which are readily lost by reactive metals like sodium, potassium etc are accepted by hydrogen ions of the acids reducing them to hydrogen gas .
However non metals do not lose electrons readily , because of which they do not displace hydrogen from acids.

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