Animal charcoal is used in decolorising colour of liquids because

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 Multiple Choice QuestionsMultiple Choice Questions

41.

Sulphur colloid prepared by

  • mechanical dispersion

  • oxidation

  • electrical dispersion

  • reduction


42.

Colour of colloids depends on which of the following factors ?

  • Size

  • Mass

  • Charge

  • Nature


43.

Which one of the following reactions is an example of heterogeneous catalysis?

  • 2CO (g) + O2 (g) NO (g) 3CO2

  • 2SO2 (g) + O2 (g) NO (g) 2SO3

  • 2CO (g) + O2 (g) Pt (s) 2CO2

  • CH3CHO (g) I2 (g) CH4 + CO


44.

Cod liver oil is

  • an emulsion

  • solution

  • colloidal solution

  • suspension


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45.

Paste is

  • suspension of solid in a liquid

  • mechanical dispersion of a solid in liquid

  • colloidal solution of a solid in solid

  • None of the above


46.

The equation for Freundlich adsorption isotherm is

  • x/m =kp1/n

  • x= mkp1/n

  • x/m= kp-n

  • All of these


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47.

Animal charcoal is used in decolorising colour of liquids because it is a good

  • adsorbate

  • adsorbent

  • oxidising agent

  • reducing agent


A.

adsorbate

Adsorbate adsorbs impurities from surface of substance.

Animal charcoal is good adsorbate. The impurities adsorb on its surface and thus it decolourises colour of liquid.


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48.

Which one of the following statements is not correct?

  • Physical adsorption decreases with increase in the temperature

  • Physical adsorption is multtlayered

  • Activation energy of physical adsorption is very high

  • Enthalpy change of physical adsorption is about 20 kJ mol


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49.

Which one of the following equations represents Freundlich adsorption isotherm ?

  • xm= Kp

  • xm= Kpn

  • logxm= Kpn

  • logxm= Kn log p


50.

Which of the following is a lyophobic colloidal solution?

  • Aqueous starch solution

  • Aqueous protein solution

  • Gold sol

  • Polymer solutons in some organic solvents


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