For poly basic acid , the dissociation constant have a different valves for each step.
`H_(3)AhArrH^(+)+A,Keq=Ka_(1)`
`H_(2)AhArrH^(+)+A^(-2),Keq=Ka_(2)`
`HA^(2)hArrH^(+)+A^(3-),Keq=Ka_(3)`
What is the observed trend of dissociation constant im successive stages ?

Options

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

Answer

A

Explanation

The value of dissociation constants for successive stages decrease.