`Ka_(1), Ka_(2)` and `Ka_(3)` are the respective constants for the following reactions
`H_(2)S hArr H^(+) + HS^(-)`
`HS^(-) hArr H^(+) + S^(2-)`
`H_(2)S hArr 2H^(+) + S^(2-)`
The correct relationship between `Ka_(1), Ka_(2)` and `Ka_(3)` is

Options

A. `K_(a_(3)) = K_(a_(1)) xx K_(a_(2))`
B. `K_(a_(3)) = K_(a_(1)) + K_(a_(2))`
C. `K_(a_(3)) = K_(a_(1)) - K_(a_(2))`
D. `K_(a_(3)) = K_(a_(1)) //K_(a_(2))`

Answer

A

Explanation

`K_(a_(3)) = K_(a_(1)) xx K_(a_(2))`