Which one of following will have the largest `pH`?

Options

A. Solution containing `1 xx 10^(-2)mol of K_(2)SO_(4)L^(-1)`.
B. Pure water.
C. Solution containing `1.0 xx 10^(-2)mol of HCI L^(-1)`.
D. Solution containing `1 xx 10^(2)mol of NH_(4)OH L^(-1)`.

Answer

D

Explanation

i. `K_(2)SO_(4)` is salt of `S_(A)//S_(B)` and do not hydrolyse so `pH = 7`
ii. pH of pure `H_(2)O = 7`
iii. pH of `10^(-2)` mols of HCI per litre = 2
iv. `pH` of weal base `NH_(4)OH` will be more than 7.