Which of the following statements is unacceptable?
(A) Among HClO3, HClO4,HClO and HClO2, HClO3 is the weakest acid.
(B)Bromide ion can be oxidised to Br2 by chlorine.
(C) Cl2O7 is the anhydride of HClO4.
(D) Among halide ions, F- has the highest hydration energy.
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