answer this
18. Equilibrium constant of some reactions are given 
as under : 
$$\begin{gathered} a) x \iff y K= {10}^{-1} \\ b)\hspace{0.17em}y \iff z K= 2 x {10}^{-2} \\ c) P\iff Q K = 3 x {10}^{-4} \\ d) R\iff S K = 2 x {10}^{-3} \end{gathered}$$
Initial concentration of the reactants for each 
reaction was taken to be equal • 
Review the above reaction and indicate the 
reactions in which the reactants and products 
respectively were of highest concentration 
1) d,c                          2) c,a
3) a,d                          4) b,c