Which of the following is not a pure substance?

Sugar solution

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Oxygen

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Hydrogen

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Copper

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Solution

The correct option is A Sugar solution
A pure substance is one which is made up of only one kind of atom or molecule. Oxygen, hydrogen and copper are made of only one kind of atom. Hence, they are pure substances.

Sugar solution is a mixture and made up of different kinds of molecules. So it is not a pure substance.

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