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The halogen having Greenish - yellow gas...

The halogen having Greenish - yellow gas reacts with hot and concentrated NaOH solution, and give products. The oxidation state of that halogen changes from 

A

0 to -1

B

0 to `+5`

C

`-1` to `+1`

D

0 to "-1" and " `+5`" states

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The correct Answer is:
D
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