Question

For which of the following reactions the equilibrium mixture will contain an appreciable concentration of both reactants and products.
(a) $C{l}_2\left(g\right)\rightleftharpoons 2Cl\left(g\right);K_c=6.4\times {10}^{39}$
(b) $C{l}_2\left(g\right)+2NO\left(g\right)\rightleftharpoons 2NOCl\left(g\right);K_c=3.7\times {10}^8$
(c) $C{l}_2\left(g\right)+2N{O}_2\left(g\right)\rightleftharpoons 2N{O}_{2}Cl\left(g\right);K_c=1.8$

• A. a
• B. b
• C. c
• D. $Noneofthese$

Answer 1

The correct option is C c

For the reaction c the equilibrium mixture will contain an appreciable concentration of both reactants and products as the value of the equilibrium constant is around unity..

(c) $C{l}_2\left(g\right)+2N{O}_2\left(g\right)\rightleftharpoons 2N{O}_{2}Cl\left(g\right);K_c=1.8$

For the reactions a and b, the equilibrium mixture will contain an appreciable concentration of products as the value of the equilibrium constant is very high.

(a) $C{l}_2\left(g\right)\rightleftharpoons 2Cl\left(g\right);K_c=6.4\times {10}^{39}$

(b) $C{l}_2\left(g\right)+2NO\left(g\right)\rightleftharpoons 2NOCl\left(g\right);K_c=3.7\times {10}^8$