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Particles of which of the following donot pass through ultra filter paper

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Colloids only

True solutions

Suspensions only

Colloids and suspension

answer is D.

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Detailed Solution

In ordinary filter paper, the porous size is big so True solutions and colloids can pass through it but not suspensions.

Filter paper soaked in colloidon and hardened with farmaldehyde is called ultra filter paper.

It allows only true solutions but can not allow suspensions and colloids to pass through it due to decrease in the size of pores.

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