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Q.

Among the following properties, how many increases down the group for Halogens 
(i) Chemical reactivity of halogens
(ii) Reducing character of hydrogen halides
(iii) M.P of halogens
(iv) Covalent character of metal halides
(v) Dissociation enthalpy of H-X bond
(vi)  Pka  of aqueous HX solutions
(vii) Boiling point of Halogens

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answer is 4.

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Detailed Solution

II,III,IV,VII 

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