Explain, why filter paper cannot be used to separate colloids?

CBSE Class 9 CBSE Class 9 Science
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  1. What would you observe when
    • a saturated solution of potassium chloride prepared at 60°C is allowed to cool to room temperature?
    • an aqueous sugar solution is heated to dryness?
    • a mixture of iron filings and sulphur powder is heated strongly?
  2. Explain, why filter paper cannot be used to separate colloids?
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    • Crystals of potassium chloride are formed because solubility decreases with decrease in temperature.
    • As water evaporates completely, sugar gets charred and turns black.
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    • The compound of iron sulphide is formed.
  2. The size of colloidal particles is less than 100 nm while the size of pores present in an ordinary filter paper is larger than 100 nm. Flence, a colloidal solution cannot be separated by filteration.