Ncert Exercises & Solutions

7.4 Write the expression for the equilibrium constant, Kc for each of the following reactions:

(i) 2NOCl (g) 2NO (g) + Cl2 (g)

(ii) 2Cu(NO3)2 (s) 2CuO (s) + 4NO2 (g) + O2 (g)

(iii) CH3COOC2H5(aq) + H2O(l) CH3COOH (aq) + C2H5OH (aq)

(iv) Fe3+ (aq) + 3OH– (aq) Fe(OH)3 (s)

(v) I2 (s) + 5F2 2IF5

(i) K_{c} = \frac{{[{NO}_{(g)}]}^{2} [{Cl}_{2 (g)}]}{{[{NOCI}_{(g)}]}^{2}} (ii) K_{c} = \frac{{[{CuO}_{(s)}]}^{2} {[{NO}_{2 (g)}]}^{4} [O_{2 (g)}]}{[Cu {({NO}_{3})}_{2 (s)}]} = {[{NO}_{2 (g)}]}^{4} [O_{2 (g)}] (iii) K_{c} = \frac{[{CH}_{3} {COOH}_{(aq)}] [C_{2} H_{5} {OH}_{(aq)}]}{[{CH}_{3} {COOC}_{2} H_{5 (aq)}] [H_{2} O_{(I)}]} = \frac{[{CH}_{3} {COOH}_{(aq)}] [C_{2} H_{5} {OH}_{(aq)}]}{[{CH}_{3} {COOC}_{2} H_{(aq)}]} (iv) K_{c} = \frac{[Fe {(OH)}_{3 (s)}]}{[{Fe}^{3 +}_{(aq)}] {[{OH}^{-}_{(aq)}]}^{3}} = \frac{1}{[{Fe}^{3 +}_{(aq)}] {[{OH}^{-}_{(aq)}]}^{3}} (v) K_{c} = \frac{{[{IF}_{5}]}^{2}}{[I_{2 (s)}] {[F_{2}]}^{5}} = \frac{{[{IF}_{5}]}^{2}}{{[F_{2}]}^{5}}