39. The Ka values for HSO4-and H2PO4- are 1.2 x 10-2 and 6.3 x 10-8 respectively. Therefore it followsthe HSO4- is a _____ acid than H2PO4- and SO42- is a _____ base than HPO42-.
(A) weaker, weaker
(B) stronger, stronger
(C) weaker, stronger
(D) stronger, weaker
(E) cannot be predicted
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