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##### 7. Consider the following equilibria:(i) 3 \mathrm{O}_{2(s)} \rightleftharpoons 2 \mathrm{O}_{3(s)} \Delta \mathrm{H}= positive(ii) \mathrm{H}_{2(s)}+\mathrm{I}_{2(s)} 2 \mathrm{HI}_{(\omega)} \Delta \mathrm{H}= positive(iii) 2 \mathrm{SO}_{2(3)} \cdot \mathrm{O}_{2(8)} \rightleftharpoons 2 \mathrm{SO}_{3(s)} \Delta \mathrm{H}= negative(b) In which direction will eachequilibrium change as the temperature is raised?

Q14 In the equilibrium$\mathrm{PCl}_{5}(\mathrm{~g}) \square \mathrm{PCl}_{3}(\mathrm{~g})+\mathrm{Cl}_{2}(\mathrm{~g}) \Delta \mathrm{H}=+90 \mathrm{~kJ} \mathrm{~mol}^{-1}$What is the effect on(a) the position of equilibrium(b) equilibrium constant? ifi) temperature is increased

Q8 (a) Write down \mathrm{K}_{c} for the following reversible reactions. Suppose that the volume of reaction mixture in all the cases is V^{\prime \prime} \mathrm{dm}^{3} at equilibrium stage.V) \mathrm{N}_{2}+3 \mathrm{H}_{2} \square 2 \mathrm{NH}_{3}

ii) Which statement about the following equilibrium is correct 2 \mathrm{SO}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \square 2 \mathrm{SO}_{3}(\mathrm{~g}) \ddot{A} \mathrm{H}=-188.3 \mathrm{~kJ} \mathrm{~mol}{ }^{-1} (a) The value of K_{p} falls with a rise in temperature(b) The value of K_{p} falls with increasing pressure(c) Adding \mathrm{V}_{2} \mathrm{O}_{5} catalyst increase the equilibrium yield of sulphur trioxide(d) The value of K_{0} is equal to K_{\text {c. }} .

Example:Calculate the \mathrm{pH} of a buffer solution in which 0.11 molar \mathrm{CH}_{3} \mathrm{COONa} and 0.09 molar acetic acid solutions are present. \mathrm{K}_{\mathrm{a}} for \mathrm{CH}_{3} \mathrm{COOH} is 1.85 \times 10^{-5}

1. For the decomposition of dinitrogen oxide \left(\mathrm{N}_{2} \mathrm{O}\right) into nitrogen and oxygen reversible reaction takes place as follows$2 \mathrm{~N}_{2} \mathrm{O}_{(\mathrm{g})} \rightleftharpoons 2 \mathrm{~N}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})}$The concentration of \mathrm{N}_{2} \mathrm{O} \mathrm{N}_{2} and \mathrm{O}_{2} are 1.1 \mathrm{~mol} \mathrm{dm}^{-3} 3.90 \mathrm{~mol} \mathrm{dm}^{-3} and 1.95 \mathrm{~mol} \mathrm{dm}^{-3} respectively at equilibrium. Find out \mathrm{K}_{\mathrm{c}} for this reaction.

11. Write note on :(ii) dynamic equilibrium