1.

Phosphoric acid ionises as :H_(3)PO_(4)overset(K_(1))hArr H^(+)+H_(2)PO_(4)^(-)H_(2)PO_(4)^(-)overset(K_(2))hArr H^(+)+H_PO_(2)^(-)H_(2)PO_(4)^(2-)overset(K_(3))hArr H^(+)+PO_(3)^(-)The equilibrium constant, K for the reaction :H_(3)PO_(4)hArr 3H^(+)+PO_(4)^(3-) is :

Answer»

`K_(1)//K_(2) K_(3)`
`K_(1)+K_(2)+K_(3)`
`K_(3)//K_(1) K_(2)`
`K_(1)K_(2)K_(3)`

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