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Incorrect statement in regard to halogens is 

Hl > HBr > HCl > HF 

(1) Chlorine has the highest electron affinity in the group. 

(2) Ionization energies of halogen are very low. 

(3) Except fluorine they show an oxidation state of –1 or +1. 

(4) Acidic strength of hydrogen halides decrease in the order

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(2) Ionization energies of halogen are very low.

Ionisation energy of halogen is very high. (Fact based)

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