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Question

Which of the following does not involve coagulation


A

Peptization

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B

Formation of delta region

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C

Treatment of drinking water by potash alum

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D

Clotting of blood by the use of FeCl3

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Solution

The correct option is A

Peptization


Explanation for correct option

(a) Peptization

  • Peptization is the process of transforming precipitate into colloid by mixing it with a suitable electrolyte known as peptizing agent.
  • Whereas coagulation is a chemical process in which the unsettlement of non- settleable particles occurs.
  • Hence coagulation and peptization are reverse/ opposite processes.

Explanation for incorrect options

(b) Formation of the delta region

  • Delta is a place where rivers meet the sea.
  • This is responsible because of coagulation.
  • River water consists of clay which makes it a colloidal solution.
  • Sea water is made up of various types of electrolytes.
  • There electrolytes coagulate the colloidal particles.
  • Hence, delta region is formed by coagulation process.

(c) Treatment of drinking water by potash alum

  • Tiny particles take a lot of time to settle.
  • Potash alum acts as coagulant, which means it makes the the particle together to make a clump.
  • And large particles will now settle faster.
  • Hence, treatment of drinking water by potash alum is a coagulation process

(d) Clotting of blood by the use of FeCl3

  • Fe3+of FeCl3(ferric chloride) coagulates blood being a negatively charged sol.
  • Blood being a colloidal solution, on rubbing ferric chloride, coagulation of blood takes place.
  • By this process, bleeding stops.
  • Hence clotting of blood by the use of FeCl3 is coagulation process.

Hence option (a) peptization is correct


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