Question

Metals replace hydrogen from acid, whereas non-metals do not. Why?

Answer 1

Metals have a 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 (H2). However, non-metals do not lose electrons readily, because of which they do not displace hydrogen from acids
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Answer 2

Metals have a tendency to lose electrons and That is why metals displace hydrogen from dilute acids.
On the other hand, non-metal is an electron acceptor. It cannot supply electrons to H+ and hence, it does not displace hydrogen from dilute acids.