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Question

Clouds are colloidal solution of -


A

solid in air

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B

water in air

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C

air in solid

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D

air in water

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Solution

The correct option is B

water in air


Explanation for the correct option :

Option (B): water in air

  • A colloid is known as a mixture in which one substance of microscopically dispersed insoluble or soluble particles is suspended throughout another substance.
  • The clouds basically consist of charged particles of water dispersed in the air.
  • Where Some of them are positively charged and others are negatively charged.

Explanation for the incorrect option :

Option (A): Solid in air

  • In the case of the colloids formed by solid in the air, solid is known as the dispersed phase and the air is known as the dispersion medium.
  • Example related to this type of colloid is: Dust suspended in air
  • Hence Clouds are not the colloidal dispersions of solid in the air.

Option (C): Air in solid

  • The colloids formed by air in solid, solid are known as the dispersion medium and the air is known as the dispersed phase.
  • Example include: solid foam
  • Thus Clouds are not known as colloidal dispersions of air in solid.

Option (D): Air in water

  • In the case of the colloids formed by air in water, the air is known as the dispersed phase and the water is known as the dispersion medium.
  • Example related to this type of colloid is: Foam
  • Hence, Clouds are not referred to as colloidal dispersions of air in water.

Hence, Clouds are colloidal dispersions of water in air .


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