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Among Group 16 elements, which one does NOT show -2 oxidation state?

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Among Group 16 elements, which one does NOT show -2 oxidation state? 

(1) O 

(2) Se 

(3) Te 

(4) Po

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Correct option is (4) Po

Oxygen shows -2, -1, +1 and +2 oxidation states 

Selenium shows -2, +2, +4 and +6 oxidation states 

Tellurium shows -2, +2, +4 and +6 oxidation states 

Polonium shows +2 and +4 oxidation states

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