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Question

Which of the following are pure substances?

Milk, iron , hydrochloric acid , mercury , wood , air.


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Solution

Pure substances:

In chemistry, pure substances mean which has a fixed chemical composition or constant structure throughout.

For example, water, air, and iron.

Conclusion:

Therefore, iron, hydrochloric acid, and mercury are examples of pure substances. While milk, wood, and air are not.


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