Hydrolysis is an acid-basedreaction of a cation or anion or both ions of a salt with water, Resultan solution of hydrolysis may be acidic, basic or netural. The anion `A^(-)` which is a weakeer base than `OH^(-)` and which his its conjugate acid HA stronger then water but weaker than `H_(3)O` shown the phenomenon of hydrolysis Ex : `CH_(3)COO^(-),CN^(-),NO_(2)^(-)` etc.
The contion `B^(+)` which is a weaker acid than `H_(3)^(+)` which is a weaker acid then `H_(3)^(+)` and which has its conjugate base BOH stronger than water but weak than `OH^(-)` shown the phenmenon of hydrolysis Ex : `NH_(4)^(+)C_(6)H_(5)NH^(+),N_(2)H_(5)^(+)` etc.
The hydrolysis constant of anion and cation are given by
`A^(-)(aq.)+H_(2)O(l)hArrHA(aq.)+OH^(-)(aq)`
`" " K_(h)=(K_(w))/(K_(a))rArr([HA(aq.)][OH^(-)(aq.)])/([A^(-)(aq.)])`
`B^(+)(aq.)+H_(2)O(l)hArrBOH(aq.)+H^(+)(aq.)`
`" " K_(h)=(K_(w))/(K_(b))rArr([BOH(aq.)][H^(+)(aq.)])/([B^(-)(aq.)])`
When pure ammonium chloride is dissolved in pure water, the pH of the resulting not 7. This is because :

Options

A. Ammonium ions accept protons from water molecules leaving fee `OH^(-)` ions in solution
B. ammonium ions donate protons to water molecules froming `H_(3)^(+)` ions in solution
C. Ammonium ions combine with water molecule to give the weak base, ammonium hydroxide
D. chloride ion made the solution acidic