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Question

The halogens (group 17 elements) :

A
have an electronic configuration of a noble gas
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B
are highly electropositive character
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C
show variable oxidation state of -1, +1, +3, +5 and +7 in their various compounds
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D
forms a volatile, covalent hydrides HX in which the halogen (X) shows an oxidation state of +1
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Solution

The correct option is C show variable oxidation state of -1, +1, +3, +5 and +7 in their various compounds
Chlorine, bromine, and iodine have available d-orbitals, therefore paired electrons in the s and p orbitals can be unpaired by promoting them to the vacant d-orbitals thus opening the possibility of variable oxidation states of 1, +1, +3, +5 and +7.

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