Which of the following statements is not true for halogens ? 

(1) All form monobasic oxyacids. 

(2) All are oxidizing agents. 

(3) All but fluorine show positive oxidation states. 

(4) Chlorine has the highest electron-gain enthalpy.

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2 Answers

(3) All but fluorine show positive oxidation states.

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.

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[Bonus] 

Solution:  Fluorine shows only-1 oxidation state and other halogen shows negative and positive oxidation state.  

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