Which of the following is an impure substance?

Which of the following is an impure substance?

A
24 carat gold
B
Air
C
Plutonium
D
None of these

Solution:

Air is an impure substance because it is formed by the mixing of various gases like He, Ne, Ar , Kr ${CO}_{2,} F_{2}, O_{2} .$

But 24 carat gold and Plutonium have only one kind species.

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