arrange the following reaction occuring at 298 and 1 atm in order of increasing tendency of the forword reaction to proceed towards equillibrium
(a) cl₂gives 2cl, K_c=5* 10^-39
(b) cl₂+2NO gives 2NOCl, K_c=3.3 *10^8
(c)cl₂+ 2NO₂ gives 2NO₂Cl_,K_{c=1.8
(ans) b<c<a (right) if not please explain}

Dear Student,

Correct order of reaction occuring at 298 and 1 atm in order of increasing tendency of the forward reaction to proceed towards equilibrium is given below:

$$\begin{gathered} a) {\text{Cl}}_{\text{2}}{\text{ → 2Cl Kc = 5 ×10}}^{-39} \\ \mathrm{b})\hspace{0.17em}{\text{Cl}}_{\text{2}}\text{ + 2NO } \to 2\mathrm{NOCl} \mathrm{Kc} = 3.3{\times 10}^8 \\ \mathrm{d}) {\text{Cl}}_{\text{2}}{\text{ + 2NO}}_2 \to 2{\mathrm{NO}}_2\mathrm{Cl} \mathrm{Kc} = 1.8 \end{gathered}$$
Correct order : b> c> a

Reason: Large value of the equilibrium constant shows that forward reaction is favoured, concentration of products is much larger than that of the reactants at equilibrium

Regards