Question

A salt `X` is dissolved in water having `pH =7`. The resulting solution has a `pH` more than `7`. The salt is made by neutralisation of
A. A strong acid and strong base
B. A strong acid and weak base
C. A weak acid and weak base
D. A weak acid and strong base.

Answer 1

Correct Answer - D
`pH gt 7` implies the solution is basic. Since salt on hydrolysis in water give basic solution. Therefore, it is a salt of weak acid strong base and undergoes anionic hydrolysis in aqueous solution
`A^(-) +HOH hArr HA +OH^(-)`