During the adsorption of krypton on activated charcoal at low tem

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 Multiple Choice QuestionsMultiple Choice Questions

91.

Which of the following electrolyte will have maximum flocculation value for Fe(OH)3 sol?

  • NaCl

  • Na2S

  • (NH4)3PO4

  • K2SO4


92.

The colour of sky is due to

  • transmission of light

  • wavelength of scattered light

  • absorption of light by atomspheric gases

  • All of the above


93.

The basic principle of Cottnell's precipitatoris

  • Le-Chatelier's principle

  • peptisation

  • neutralisation of charge on colloidal particles

  • scattering of light


94.

Rate of physical adsorption increases with

  • decrease in surface area

  • decrease in temperature

  • decrease in pressure

  • increase in temperature


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95.

The function of Fe(OH)3 in the contact process is

  • to remove arsenic impurity

  • to detect colloidal impurity

  • to remove mositure

  • to remove dust particle


96.

Which one ofthe following does not involve coagulation?

  • Formation of delta regions

  • Peptization

  • Treatment of drinking water by potash alum

  • Clotting of blood by the use of ferric chloride


97.

Which one of the following statements is true?

  • Saponification of oil yields a diol

  • Drying of oil involves hydrolysis

  • Addition of antioxidant to oil minimizes rancidity

  • Refining of oil involves hydrogenation


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98.

During the adsorption of krypton on activated charcoal at low temperature

  • H < 0 and S < 0

  • H > 0 and S < 0

  • H > 0 and S > 0

  • H < 0 and S > 0


A.

H < 0 and S < 0

During adsorption, heat is liberated hence H is negative (less than zero) and entropy decreases.


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99.

Which one of the following does not involve coagulation?

  • Clotting of blood by the use of ferric chloride

  • Formation of delta region

  • Treatment of drinking water by potash alum

  • Peptization


100.

Which one of the following is an example for homogeneous catalysis?

  • Manufacture of sulphuric acid by Contact process

  • Manufacture of ammonia by Haber's process

  • Hydrolysis of sucrose in presence of dilute hydrochloric acid

  • Hydrogenation of oil


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