Pure substances and mixtures — task. Chemistry CBSE Live product, Class 8 (2025-26).

Help Mithran topick the correct answer and give reason in support of his answer:

In which of the following cases are all the examples correctly matched?

Uniform mixtures— sugar solution, seawater, bronze, air
Pure substances— carbon dioxide, iron, oxygen, salt water
Elements — water, nitrogen, iron, air
Non-uniform mixtures — air, sand, brass, muddy water

Reason:

They are pure substance as they are combined physically
They are pure substance as they are made of one kind of particle
They are impure substance as they are made of one kind of particle
They are pure substance as they are made of different kind of particle

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