Assertion (A): A gas fills the whole of any closed container in which it is kept. Reason (R): Gas particles move freely in all directions because the forces of attraction between them are very weak.

Question

Assertion-ReasonProperties of GasesIntermolecular Forces of Attraction

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State one similarity and one difference between evaporation and boiling.

Intermolecular Spaces in Matter

Evaporation as a Surface Phenomenon

Factors Affecting Rate of Evaporation

Three States of Matter: Solid, Liquid and Gas

Boiling and Boiling Point

List four factors which affect the rate of evaporation.

Describe an activity to show that water vapour is present in air.

Distinguish solids, liquids and gases in a tabular form under the following characteristics-

A motor car, with its glass totally closed, is parked directly under the sun. The inside temperature of the car rises very high. Explain why?

What are the causes of water pollution? Discuss how can you contribute in reducing the water pollution.