Mark the element which shows only one oxdation state

Mark the element which shows only one oxdation state
  1. $\mathrm{F}$
  2. $\mathrm{Cl}$
  3. Br
  4. I

Solution

Fluorine always shows only one oxidation state. Its oxidation state in all its compounds is $-1 .$

Asked in: JEE-TOPICTESTS-CHEMISTRY

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