H3PO4 is a stronger acid than H2PO4−and HPO42− H3PO4(aq)⇌H+(aq)+H2PO4−(aq)‌Ka1=7.5×10−3 H2PO4−(aq)⇌H+(aq)+HPO42−(aq)‌Ka2=6.2×10−8 HPO42−(aq)⇌H+(aq)+PO43−(aq)‌Ka3=1.7×10−12 Ka1>Ka2>Ka3‌ log‌K=log‌Ka1+log‌Ka2+log‌Ka3‌ Ans. (A), (B) and (C) only