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Among the following element which shows ...

Among the following element which shows shows only 'one' non-zero oxidation state is -

A

O

B

Half

C

Cl

D

F

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The correct Answer is:
D
(1) O shown `-1, -2, + 1, +2, 0`
(2) H shown `-, +1, 0`
(3) Cl shown `-1, +1, +3, +5, +7, 0`
(4) F shows `-1, 0`
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