Surface Chemistry English Surface Chemistry English 1 / 19Bredig's arc method can't be used for the preparation of the which of the following metal sol? Cu K Au Pt 2 / 19Catalytic property generally shown by- transition metals non-transition metals inner transition metals representative elements 3 / 19Catalyst used in the hydrogenation of oil- Pt Ni Mo V₂O5 4 / 19Which catalyst is sensitive to change in temperature? TnO2 Pt Zymase Ni 5 / 19The dispersion of liquid in a liquid is called Gel froath Emulsion aerosol 6 / 19Milk is an example of- froath emulsion Gel sol. 7 / 19The purification of colloidal solution is done by- filtration centrifugation Dialysis osmosis 8 / 19Which among the following property of colloidal solution is independant of charge- Electro-osmosis Tyndal effect Coagulation Electric particle conduction 9 / 19Which one of the following is a lyophilic colloid? Milk Gum fog blood 10 / 19Correct for the adsorption of gas on solid-(i) According to freundlich adsorption isotherm the amount of adsorption = kPn(ii) According to freundlich adsorption isotherm, the quantity of adsorption = kpm1/m(iii) According to Langmuir adsorption isotherm the quantity of adsorption = aP (1+bP)(iv) At low temperature freundlich isotherm fails (i) and (ii) (iii) and (iv) (i) and (iii) (ii) and (iv) 11 / 19Lyophilic sol. are stable due to- Charge on the particles Large size of the particles Small size of the particles Layer of dispersion medium on the particles. 12 / 19Tyndall effect is not observed in- Suspensions Emulsions Sugar solution Gold solution 13 / 19The size of colloidal particles ranges between- 10 -7 to 10-9 cm 10-9 to 10-11cm 10-5 to 10-7cm 10-2to 10-3 cm 14 / 19The reason of Brownian motion is- conversion of vapour into liquid flow of electricity unbalanced bombardment of the particles by the molecules of dispersion medium force of attraction between dispersed phase and dispersion medium 15 / 19An example of biological catalyst is- an enzyme a carbohydrate an amino acid a nitrogenous base 16 / 19Catalyst increases the rate of reaction. by decreasing the enthalpy by decreasing internal energy by decreasing the activation energy by increasing the activation enrgy 17 / 19Which among the following show the characteristics of a catalyst. It changes the equilibrium point It starts the reaction It increases the rate of reaction It increases the kinetic energy of molecules 18 / 19The process of adsorption is- exothermic endothermic exothermic and endothermic None of these 19 / 19The material on the surface of which adsorption takes place is called- Adsorbent Adsorption Adsorbate and adsorbent None of these Your score isThe average score is 68% 0% Restart quiz
