The pH 0.1 M solution the following salts increases in the order.

Options

A. `NaCI lt NH_(4)CI lt NaCN lt HCI`
B. `HCI lt NH_(4)CI lt NaCI lt NaCN`
C. `NaCN lt NH_(4)CI lt NaCI lt HCI`
D. `HCI lt NaCI lt NaCN lt NH_(4)CI`

Answer

B

Explanation

HCI: Strong acid (pH=1)
`NH_(4)CI:`Salt of weak bae + strong acid
it gives acidic solution (pH lt 7).
NaCI: Salt of strong base + Strong base
It gives neutral solution with pH=7
NaCN : Salt of strong base + Weak acid
It gives basic solution with `pH gt 7`
Thus the increasing order of pH is
`HCI lt NH_(4)CI lt NaCI lt NaCN`