The following aqueous solutions given in column containing 1:1 mole ratios of the respective pairs of substances. Assume all concentrations are I M.
`{:("List-I", " " "List-II"),((A) NaOH+NH_(4)OH,P."A buffer with a pH less than 7"),((B)NaOH+HCI,Q."A buffer with a pH greater than 7"),((C)HCN(P_(ka)=9)+KCN,R."The solution with a pH of 7"),((D) C_(6)H_(5)NH_(2)(P_(ka)=9.5)+C_(6)H_(5)NH_(3)""^(+)Cl^(-),S."The solution with the highest pH "):}`