In which of the following cases are all the examples correctly matched? Give reasons in support of your answers. Class 8

In which of the following cases are all the examples correctly matched? Give reasons in support of your answers. Class 8

In which of the following cases are all the examples correctly matched? Give reasons in support of your answers. Class 8

(i) Elements - water, nitrogen, iron, air.

(ii) Uniform mixtures - minerals, seawater, bronze, air.

(iii) Pure substances - carbon dioxide, iron, oxygen, sugar.

(iv) Non-uniform mixtures - air, sand, brass, muddy water.

Answer:

(i) Incorrect. Water is a compound, not an element.

(ii) Incorrect. Minerals are non-uniform mixtures.

(iii) Correct. All listed examples are pure substances.

(iv) Incorrect. Air is a uniform mixture, while sand and muddy water are non-uniform mixtures.