The sky appears blue because some of the blue component of sunlight is scattered by:
(a) gas molecules present in air
(b) dust particles present in air
(c) water droplets suspended in air
(d) soot particles present in air

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Solution

(a) gas molecules present in air

The sky appears blue because some of the blue component of sunlight is scattered by the gas molecules (nitrogen and oxygen) present in the air.

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In the white light of sun, maximum scattering by the air molecules present in the earth's atmosphere is for :

(a) red colour (b) yellow colour

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