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Question
Assertion :The colour of purple of cassius or gold sol in water changes from red to blue on keeping for sometime. Reason: The size and shape sol particles changes with time.
Assertion :The colour of purple of cassius or gold sol in water changes from red to blue on keeping for sometime. Reason: The size and shape sol particles changes with time.
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Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The colour of a colloidal solution depends upon the size of colloidal particles present in it. Larger particles absorb the light of longer wavelength and therefore transmit light of shorter wavelength. For example, a silver so having particles of size 150 nm appears violet whereas those having particles of size 60 nm appears orange yellow.
The colour of purple of cassius or gold sol in water changes from red to blue on keeping for sometimes due to change in size of solution particles.
The colour of a colloidal solution depends upon the size of colloidal particles present in it. Larger particles absorb the light of longer wavelength and therefore transmit light of shorter wavelength. For example, a silver so having particles of size 150 nm appears violet whereas those having particles of size 60 nm appears orange yellow.
The colour of purple of cassius or gold sol in water changes from red to blue on keeping for sometimes due to change in size of solution particles.
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