A colloid consists of the dispersed phase and dispersed medium. Aerosol is one type of colloid. Aerosol is made up of which of the following combination?
I. Gas in liquid
II.Liquid in gas
III. Solid in gas
IV.Gas in solid

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Important Questions on Is Matter Around Us Pure?

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9th CBSE

IMPORTANT

All In One SCIENCE CBSE Class IX>Chapter 2 - Is Matter Around Us Pure?>Challengers*>Q 8

Among the following statement, point out the incorrect separation technique.
I.Separation of colloidal particles from solution- centrifugation.
II.Separation of two miscible liquids- separating funnel.
III.Separation of pure substance from its impure form- crystallisation.
IV.Separation of components with the help of the same solvent- chromatography.

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9th CBSE

IMPORTANT

All In One SCIENCE CBSE Class IX>Chapter 2 - Is Matter Around Us Pure?>Challengers*>Q 9

Which of the following are chemical changes?
I. Decaying of wood.
II. Burning of wood.
III. Sawing of wood.
IV. Hammering of a nail into a piece of wood.

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9th CBSE

IMPORTANT

All In One SCIENCE CBSE Class IX>Chapter 2 - Is Matter Around Us Pure?>Challengers*>Q 10

White gold used in jewellery contains two elements, gold and palladium. A jeweller has two different samples that are both identical in appearance and have a uniform composition throughout. What can be said about the samples?