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For `H_(3)PO_(4)`, `H_(3)PO_(4) hArr H_(2)PO_(4)^(-) + H^(+) (K_(1))`
`H_(2)PO_(4)^(-) hArr HPO_(4)^(2-) + H^(+) (K_(2))`
`HPO_(4)^(2-) hArr PO_(4)^(3-) + H^(+) (K_(3))` then
A. `K_(1) gt K_(2) gt K_(3)`
B. `K_(1) lt K_(2) lt K_(3)`
C. `K_(1) = K_(2) = K_(3)`
D. `K_(1).K_(2).K_(3) = K_(w)`

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