How many of the following salts:
i. `NH_(4)C_(2)H_(3)O_(2)` ii. `PhCOONH_(4)` iii. `NaC_(2)H_(3)O_(2)`
iv. `NH_(4)CI` v. `MgS` vi. `Na_(2)SO_(4)`
vii. `KCI`
a. Hydrolyse more in water at `25^(@)C`.
b. Do not hydrolyse.
c. Both cation and anion hydrolyse to the same extent.
d. Both cation and anion hydrolyse to differnet extent.

Answer

A, B, C

Explanation

a. Salt of `W_(A)//W_(B)` and `W_(B)//S_(A)` hydrolyses more in water.
III. `NaC_(2)H_(3)O_(2)` (salt of `W_(A)//S_(B)) rarr C_(2)H_(3)O_(2)^(Theta)`.
IV. `NH_(4)CI` (salt of `W_(B)//S_(B)) rarr overset(o+)NH_(4)`
V. `MgS` (salt of `W_(A)//S_(B)) rarr S^(2-)`
b. Salt of `S_(A)//S_(B)` do not hydrolyse.
VI. `Na_(2)SO_(4)` VIII. `KCI`
c. Salt of `W_(A)//S_(B) (NH_(4)C_(2)H_(3)O_(2))` with same value of `K_(a)` and `K_(b)`, both hydrolyse to the same extent. `(K_(a)` of `CH_(3)COOH = K_(b) of NH_(3))`
d. II. Salt of `W_(A)//W_(B)` with different `K_(a)` and `K_(b)`, both hydrolyse to the same extent. `(PhCOONH_(4)` have different `K_(a)` and `K_(b))`