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Sucrose (sugar) crystals obtained from s...

Sucrose (sugar) crystals obtained from sugarcane and beetroot are mixed together. Will it be pure substance or a mixture? Give reasons for the same.

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According to law of constant composition or definite proportion, irrespective of the source a chemical compound it is always found to be made of the same elements combined together in the same fixed proportion by mass.
Thus, in the light of the above law, it will be a pure substance. It is because sugar obtained by different sources like sugarcane and beetroot will have the same composition.
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