Chair is a solid because of the fallowing properties -
it has a definite shape
it has fixed  volume
the  particles are most closely packed
it has a high density
they do not have a tendency to diffuse
it has the maximum intermolceular forces of attaraction
they are rigid
they are not compressable

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each and every objects are made up of molecules. In solid molecules are closely packed.they can only vibrate iin its position,cant move from one place to they have definite volume,size,shape
Chair is not solid because:
1. it cannot be compressible
2.the molecules are closely packed.
3.the molecules cannot diffuse.