1.Metals are____in character.
2. Why non metals do not displace hydrogen from dilute acid.

Dear student,

1) Metals are electropositive in character. Metals have very low ionization energy and have a high tendency to lose electrons.

2) 

Non-metals do not displace hydrogen from dilute acids is because, unlike metals, non-metals do not have a tendency to lose electrons but to gain electrons. 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). 

 2 H₊ + 2e^- → H₂

However, non-metals do not lose electrons readily, because of which they do not displace hydrogen from acids. Another important point to note is that not all metals will displace hydrogen from acids. Only those metals which are reactive than hydrogen will displace H₂ from acids. 

Regards