The colour of a colloidal solution is due to

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(A) The colour of a colloidal solution depends upon the size of colloidal particles present in it. Larger particles absorb light of longer wavelengths

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Different size of colloidal particles

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(A) The colour of a colloidal solution depends upon the size of colloidal particles present in it. Larger particles absorb light of longer wavelengths and transmit light of shorter wavelengths. For example,a silver sol having particles of size $150 \, nm$ appears violet,whereas that having particles of size $60 \, nm$ appears orange-yellow.

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