Which of the following solution have `pH gt 7`.
I. `BaF_(2)` II. `RbI`
III. `C_(6)H_(5)COONa`
IV. `(CH_(3)COO)_(2)Ba`

Options

A. `I`
B. `I,II, III`
C. `I,III`
D. `I,III,IV`

Answer

D

Explanation

Salt of `S_(B)//S_(A)` have `pH = 7`. (Salt of `W_(A)//W_(B)` have `pH = 7`, if basic is stronger, i.e., if `K_(b) gt K_(a)` or `pK_(a) gt pK_(b))`.
`{:(I.,BaF_(2),-=,Ba(OH)_(2)+,HF),(,"Salt of"S_(B)//S_(A),,S_(B),W_(A)),(II.,RbI,-=,RbOH+,HI),(,"Salt of"S_(B)//S_(A),,S_(B),S_(A)),(III.,C_(6)H_(5)COONa,-=,C_(6)H_(5)COOH+,NaOH),(,"Salt of"W_(A)//S_(B),,W_(A),S_(B)),(IV.,(CH_(3)COO)_(2)Ca,-=,2CH_(3)COOH+,Ca(OH)_(2)),(,"Salt of"W_(A)//S_(B),,W_(A),S_(B)),(,(pHgt7),,,):}`