Multiple choice

The process used to prevent the sol particles from setting out under the action of gravity is known as

  1. ultra centrifugation

  2. ultra filtration

  3. electrodialysis

  4. dialysis
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A Correct answer
Explanation

The sol particles are prevented from setting out under the action of gravity by kinetic impacts of the molecules of the medium. The setting force can be enhanced by using high speed centrifugal machines having 15,000 or more revolutions per minute. Such machines are known as ultra-centrifuges.

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