The colour of sky is due to from Chemistry Surface Chemistry

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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


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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


B.

wavelength of scattered light

The blue colour ofsky is due to Tyndall effect ie, the colloidal particles absorb light, become self luminous and then scatter light of different wavelengths in all possible directions.


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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


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


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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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