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Which among the following is not a a con...

Which among the following is not a a conjugate acid base pair?

A

`H_2O and OH^-`

B

`SO_4^(2-) and H_2SO_4`

C

`H_3PO_4 and H_2PO_4^-`

D

H_2CO_3 and HCO_3^-`

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