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Q.

Which of the following will happen to the solution of starch on hot water

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a

If light is thrown with torch, it is scattered

b

If filtered, starch particles will be obtained as the filter paper as residue

c

Solution is turbid on the begining but will become clear after 2 - 3 days

d

Particles of starch will settle down after 2 - 3 days

answer is D.

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Detailed Solution

Starch is a colloidal solution because the particle diameter lies between 1 nm to 100 nm. If torch light is applied on starch solution then the light is scattered. This is known as Tyndall effect.

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