Aparticle is at rest on a horizontal plane the plane is slowly tilted until the particle starts to move and is then fixed with static and kinetic coefficient of friction are us and uk, uk> us. calculate the acceleration of the particle ​

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Metals are usually electron donors, that is, are electropositive. hydrogen is also an electron donor in water molecule to oxygen atom. metals with more electropositivity can replace hydrogen from water like sodium. so such metals replace hydrogen in dilute acids and form salts.
example: 2 na + 2 h cl ==> 2 na cl + h2

non metals can be electron acceptors or electron donors. if are electron acceptors, then are electronegative. may replace oxygen or hydroxide or a halogen. but do not replace hydrogen.

many non-metals are below hydrogen in the reactivity series. are weaker than hydrogen. so do not displace hydrogen from dilute acids. so nonmetals do not react with dilute acids.