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Which of the following statements is not true for halogens?
Explanation
The key treats F as showing +1 in HOF, so the first statement is the untrue one.
Detailed Solution
Due to high electronegativity and small size, F forms only one oxoacid, HOF, known as fluoric (I) acid.
Oxidation number of F is +1 in HOF.
So the statement 'All but fluorine show positive oxidation states' is not true.