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The H2PO4^– ion has both a conjugate acid and a conjugate base. It is true that

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The H2PO4 – ion has both a conjugate acid and a conjugate base. It is true that 

(A) H3PO4 is the conjugate acid. 

(B) HPO4 2– is the conjugate base. 

(C) H2PO3– is the conjugate base. 

(D) more than one correct response 

(E) no correct response

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(D) more than one correct response

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