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Account for the followings: 

(a) Sulphur exhibits variable oxidation states. 

(b) Fluorine exhibits only –1 oxidation state. 

(c) Oxygen can’t extend its valency from 2. 

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(a) Due to the presence of vacant d orbitals in sulphur.
(b) It is most electronegative element.
(c) Small size/unavailability of vacant d orbitals in O.

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