For, `H_(3)PO_(4)+H_(2)OhArrH_(3)O^(+)+H_(2)PO_(4)^(-), K_(a_(1))`
`H_(2)PO_(4)+H_(2)OhArrH_(3)O^(+)+HPO_(4)^(2-), K_(a_(2))`
`HPO_(4)^(2-)+H_(2)OhArrH_(3)O^(+)+PO_(4)^(3-), K_(a_(3))`
The correct order of `K_(a)` values is:

Options

A. `K_(a_(1))gtK_(a_(2))ltK_(a_(3))`
B. `K_(a_(1))ltK_(a_(2))ltK_(a_(3))`
C. `K_(a_(1))gtK_(a_(2))gtK_(a_(3))`
D. `K_(a_(1))ltK_(a_(2))gtK_(a_(3))`

Answer

C

Explanation

The dissociation constant for different ateps dissociation of weak polyrotic acid decreases continuously, i.e., `K_(a_(1))gtK_(a_(2))gtK_(a_(3))`