Which of the following statement is incorrect? (WB JEE 2013) (a) ICI is a good conductor of elec...

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Which of the following statement is incorrect?
(WB JEE 2013)
(a) ICI is a good conductor of electricity in fused state
(b) \( \mathrm{Cl}_{2} \mathrm{O}_{7} \) is anhydride of perchloric acid
(c) Melting and boiling points of \( \mathrm{HBr} \) is less than \( \mathrm{HCl} \)
(d) \( F_{2} \) forms only one oxoacid
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