Which of the following will be most effective in the coagulation

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 Multiple Choice QuestionsMultiple Choice Questions

121.

The movement of colloidal particles towards their respective electrodes in the presence of an electric field is known as :

  • electrolysis

  • Brownian movement

  • dialysis

  • electrophoresis


122.

Which of the following is not a favourable condition for physical adsorption?

  • High temperature

  • High pressure

  • Higher crtical temperature of adsorbate

  • low temperature


123.

Which of the following acts as protective colloid?

  • silica gel

  • gelatin

  • sodium acetate

  • none of these


124.

Which of the following is the best protective colloid?

  • Gelatin (Gold No. 0.005)

  • Gum arabic (Gold No. 0.15)

  • Egg albumin (Gold No. 0.08)

  • None of the above


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125.

An example of dispersion of a liquid in a gas is :

  • milk

  • vegetable

  • foam

  • mist


126.

Hydrogenation of vegetable oils in presence of finely divided nickel as catalyst.The reaction is

  • enzyme catalysed reaction

  • homogeneous catalysis

  • heterogeneous catalysis

  • liquid catalysed reaction


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127.

Which of the following will be most effective in the coagulation of Fe(OH)3 sol ?

  • KCN

  • BaCl2

  • NaCl

  • Mg3(PO4)2


D.

Mg3(PO4)2

According to Hardy Schulze rule coagulating power of ions is + α charge on ion.

Since, Fe(OH)3 is positively charged colloid. It will be coagulated by anion.

(i) KCN → K+ and CN-

(ii) BaCl2 → Ba2+ and Cl-

(iii) NaCl → Na+ and Cl-

(iv) Mg3(PO4)2 - Mg2+ and PO43-

 PO43- has highest charge in it among anions. 

Therefore, Mg3(PO4)2 is most effective in coagulation of Fe(OH)3.


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128.

Tyndall effect shown by colloids is due to :

  • scattering of light by the particles

  • movements of particles

  • reflection of light by the particles

  • coagulation of particles


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129.

Alum is added to muddy water because :

  • it acts as disinfectant

  • it results in coagulation of clay and sand

  • clay is soluble in alum, hence removes it

  • it makes water alkaline, which is good for health


130.

Active charcoal is a good catalyst because :

  • made up of carbon atoms

  • is very reactive

  • has more adsorption power

  • has inert nature toward reagent


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