The `pH` of `0.1M` solution of the following salts decreases in the order

Options

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

Answer

B

Explanation

The Characterstics of the given solutions are:
`NaCI` Neutral solution (Salt of `S_(A)//S_(B))`
`NH_(4)CI` Slightly acidic sue to the reaction (Salt of `W_(B)//S_(A))`
`NH_(4)^(o+) +NH_(4)OH +H^(o+)`
`NaCN` Slightly alkaline due to the reaction (Salt of `S_(B)//W_(A))`
`CN^(Theta) +H_(2)O hArr HCN +OH`
`HCI` highly acidic
The `pH` of the solution will follow the order highly acidic lt slightly acidic lt neutral lt slightly alkaline.
i.e., `HCI lt NH_(4)CI lt NaCI lt NaCN`