Which of the following solution will have `P^(H)` closer to `1.0`?

Options

A. 100 ml of M//10 HCl+45 ml of M// 10NaOH
B. 55 ml of M//10 HCl+45 ml of M//10 NaOH
C. 10 ml of M//10 HCl+90 ml of M//10 NaOH
D. 75 ml of M//5 HCl+25 ml of M//5 NaOH

Answer

D

Explanation

`[H^(+)]=(NaVa-NbVb)/(Va+Vb)` if `NaVa gt Nb Vb)`
`P^(H)=-log[H^(+)]`
`[H^(+)]=10^(-1), :. P^(H)=1`