Question

why sugar is a pure substance not a mixture​

Answer 1

Answer:

There are no other things mixed in it, so it is a pure substance. (Mixtures are two or more substances mixed together.) Every grain of sugar has near it only another grain of sugar. There are no other substances mixed in it.

Explanation:

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Answer 2

Answer:

Sugar is a pure substance because its composition is homogeneous throughout. Pure substances can be either elements or compounds. Sugar or sucrose is a compound with the chemical formula C12H22O11.