A) Fluorine
B) Chlorine
C) Bromine
D) Iodine
Correct Answer: A
Solution :
Previously it was believed that F does not form an oxy-acid. However, recent studies have confirmed the existence of HOP (hypo fluorous acid). The rest all halogens form four series of oxy-acids with formula \[HOX,\]\[HX{{O}_{2}},\]\[HX{{O}_{3}}\] and \[HX{{O}_{4}}\]. (where \[X=Cl,\] \[Br,\] \[I\])
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