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MHT-CET Adsorption and Colloids — practice questions — page 3

Explore 77 free Adsorption and Colloids questions in MHT-CET Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Adsorption and Colloids questions and exercises with answers

Showing questions 61–77 of 77.

Converting a freshly formed precipitate into a colloidal sol using a small amount of electrolyte is calledRead the answer and worked solution →Hydrolysis of FeCl3 with water yields a sol ofRead the answer and worked solution →Purification of a colloidal solution by removing dissolved ions through a membrane is calledRead the answer and worked solution →The scattering of light by colloidal particles, making the beam visible, is theRead the answer and worked solution →For the Tyndall effect, the refractive indices of dispersed phase and medium mustRead the answer and worked solution →The ceaseless zig-zag motion of colloidal particles is calledRead the answer and worked solution →Brownian motion arises from collisions of dispersed particles withRead the answer and worked solution →Movement of colloidal particles under an applied electric potential is calledRead the answer and worked solution →If colloidal particles move toward the cathode in electrophoresis, they areRead the answer and worked solution →Which sol carries a positive charge?Read the answer and worked solution →Precipitation of a colloid by removal of the charge on its particles is calledRead the answer and worked solution →Mixing positively charged Fe2O3 sol with negatively charged As2S3 sol causesRead the answer and worked solution →According to the Hardy-Schulze rule, coagulating power of an ion increases with itsRead the answer and worked solution →Which ion is the most effective in coagulating a negative sol?Read the answer and worked solution →An emulsion is a colloid formed by dispersing a liquid inRead the answer and worked solution →Milk is an emulsion of which type?Read the answer and worked solution →Gum in water is an example of aRead the answer and worked solution →

Worked practice questions

Converting a freshly formed precipitate into a colloidal sol using a small amount of electrolyte is called

  1. coagulation
  2. peptization
  3. dialysis process
  4. electrophoresis
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Correct answer: B. peptization

The electrolyte used is the peptizing agent; the precipitate adsorbs its ions and breaks up.

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Hydrolysis of FeCl3 with water yields a sol of

  1. ferric hydroxide
  2. ferric oxide only
  3. ferrous sulfide
  4. metallic iron
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Correct answer: A. ferric hydroxide

FeCl3 + 3H2O gives Fe(OH)3 and HCl, with Fe(OH)3 forming the sol.

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Purification of a colloidal solution by removing dissolved ions through a membrane is called

  1. peptization
  2. dialysis
  3. coagulation
  4. sorption
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Correct answer: B. dialysis

Dialysis lets small ions pass through a membrane while colloidal particles are retained.

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