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

• NaCl

• Na₂S

• (NH₄)₃PO₄

• K₂SO₄

The colour of sky is due to

• transmission of light

• wavelength of scattered light

• absorption of light by atomspheric gases

• All of the above

The basic principle of Cottnell's precipitatoris

• Le-Chatelier's principle

• peptisation

• neutralisation of charge on colloidal particles

• scattering of light

Rate of physical adsorption increases with

• decrease in surface area

• decrease in temperature

• decrease in pressure

• increase in temperature

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

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

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

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

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