Oxidation number of potassium in

Question:

Oxidation number of potassium in $\mathrm{K}_{2} \mathrm{O}, \mathrm{K}_{2} \mathrm{O}_{2}$ and $\mathrm{KO}_{2}$, respectively, is :

  1. $+1,+4$ and $+2$

  2. $+1,+2$ and $+4$

  3. $+1,+1$ and $+1$

  4. $+2,+1$ and $+\frac{1}{2}$

Correct Option: , 3

Solution:

Potasisum has an oxidation of $+1$ (only) in combined state.

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