Question

The halogen (Group 17 elements):

• A. have an electron configuration of a noble gas less seven electrons
• B. are highly electro positive
• C. show variable oxidation state of -1, +1, +3, +5 and +7 in their various compounds
• D. forms a volatile, covalent hydrides HX in which the halogen (X) shows an oxidation state of +1

Answer 1

The correct option is C show variable oxidation state of -1, +1, +3, +5 and +7 in their various compounds

Fluorine is the most electronegative in halogen family so it has oxidation number of -1 in all its compounds. But Cl, Br and I are less electronegative (than oxygen also) so that these elements form compounds with oxidation number of +1, +3, +5 and +7. Thus (c) is the correct option.