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Revision Questions beg type of intermolecular forces exist between the molecules of different substances? What are ; 'n Der Waal forces? What is the nature of Van der Waals interaction? Whe tad ; ‘tare London or dispersive interaction? How do these interaction originated between the molecules? What d ; : me you know about Ion-dipole forces and instantaneous induced intermolecular forces? What 4 fect on properties of the substances? Detive exy " me aoe for the calculation of V,, P, and T, in terms of Van der Waals constant. uit, YA! significance of gas constant R. Calculate its numerical value in terms of different What ‘te the postulates of kinetic theory of gases? We express Deivekinte ‘on for the pressure exerted by an ideal gas or derive kinetic gas equation. , 88S equation keeping in view the assumptions of kinetic molecular theory of gases. i eBoy e's ; |, Meten os Charle’s law from the kinetic gas equation. ” Woscarcat nee oF the assumption that lisions are elastic? i 2 effect on the motion of gas molecules? (b) Gravity has no 11, @) Distinguistian ideal gnsand areal ga. (0) Define compressibility factor and Boyle’s temperature. (©) Defineideal gasand explain how it isdifferent from seal gases. Explain thedeviations of real gases from ideal behaviour, 13, Doreal gases obey the equation PV = RP Give reasons for you answer. “ue Explain why gases fail to obey the general gas equation of high pressure and low temperature 4S. ‘What are the limitations of the equation PV = RT? What improvements have been Uggs van der Waals? 16. Derive'van der Waals’ equation of state for n moles of a gas. 1. ‘Show that van der Waals’ equation for one mole of a gas can be written in the form PV_,,oP_@ ab —S=lto—-o + RT RT RTV RTV? 18 ‘What is excluded volume? Show that the excluded volume is four times the actual volume ofa gi, 19. How does van der Waals’ equation explain the bchaviour of real gases when (@) pressure is low, (b) pressureis high and, (©) temperature is high 20. (a) How does van der Waals’ equation explain the exceptional behaviour of hydrogen and heliun? (b) . What are the limitations of van der Waals’ equation? 21, What do jou know about potential energy surfgce concept? Discuss its applications 2. —_ Explain the classification of potential energy surface in terms of attractive and repulsive forcesvih ‘suitable examples. B Discuss in detail the potential energy surface for H,* system. seas 
