Question

what are pure substances and its two types​

Answer 1

A pure substance has a definite and constant composition — like salt or sugar. A pure substance can be either an element or a compound, but the composition of a pure substance doesn't vary.

Answer 2

a pure substance is one which is made up of only one kind of particle . a pure substance is homogeneous throughout its mass. a pure substance cannot be separated into other kind of matter by and physical process.

types of pure substance .

element ,
compound , etc.

examples :-

gold ,
sugar,
silver,
salt,
platinum, etc.