Buffer solutions can be prepared form mixtures of

Options

A. `HCI` and `NaCI`
B. `NaH_(2)PO_(4)` and `Na_(2)HPO_(4)`
C. `CH_(3)COOH +NaCI`
D. `NH_(4)OH+NH_(3)`

Answer

B

Explanation

Buffer solution is a mixture of
`W_(A) + salt of W_(A)//S_(B)`
or a mixture of `W_(B) + "Salt of" W_(B)//S_(A)`.
So `(NaH_(2)PO_(4)+Na_(2)HPO_(4))` is a buffer.
`{:(a.[HCI+NaCI,],,S_(A)+"Salt of"S_(A)//S_(B)("not buffer"),,),(b.[NaH_(2)PO_(4)+Na_(2)HPO_(4)],,W_(A)+ "Salt of" W_(A)//S_(B).("It is a buffer"),,),(c.[CH_(3)COOH+NaCI],,W_(A)+"Salt of"S_(A)//S_(B)("not buffer"),,),(d.[NH_(4)OH+NH_(3)],,W_(B)+W_(B)("not buffer"),,):}`