A emulsifier is a substance which

• stabilises the emulsion

• homogenises the emulsion

• coagulates the emulsion

• accelerates the dispersion of liquid in liquid

The temperature of the system decreases in an

• adiabatic compression

• isothermal compression

• isothermal expansion

• adiabatic expansion

An example for autocatalysis is :

• oxidation of NO to NO₂

• oxidation of SO₂ to SO₃

• decomposition of KClO₃ to KCl and O₂

• oxidation of oxalic acid by acidified KMnO₄

2SO₂ (g) + O₂ (g) $\stackrel{{\mathrm{V}}_2{\mathrm{O}}_5}{\rightleftharpoons }$ is an example for 

• neutralisation reaction

• homogeneous catalysis

• heterogeneous catalysis

• irreversible reaction

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