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Question

Which of the following is not a colloidal system in common life?

This question was previously asked in
HTET 2025 Level 1 PRT Question Paper (5-Jul-2026)
The correct answer is

Sugar solution

Milk (fat globules dispersed in water), fog (water droplets dispersed in air) and smoke (solid particles dispersed in air) are all common colloidal systems. A sugar solution is a true homogeneous solution in which sugar molecules dissolve completely at the molecular level, so it is not a colloid.

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Important Questions from Surface Chemistry

  1. What is the name of the effect seen when light is scattered by tiny particles in a colloidal solution?
  2. Which one of the following is not a colloid ?
  3. The following item consists of two statements, Statement I and Statement II. Examine these two statements carefully and select the correct answer using the code given below :
    Statement I : Catalytic hydrogenation is highest when the catalyst remains in the powdered form
    Statement II : When a catalyst is in the powdered form, its surface area becomes highest

  4. On adding some detergent to water, the surface tension

  5. The process by which a chemical change takes place in a substance when electric current is passed through it is called
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