MCQ
$O - O$ bond length order in $O _2^{-2}, O _2^{-}, O _3$ and $O _2$ :
- A$O _2^{-2}< O _2^{-}< O _3< O _2$
- B$O _2^{-2}> O _2^{-}> O _3> O _2$
- ✓$O _2^{-2}> O _2^{-}= O _3> O _2$
- D$O _2^{-2}< O _2^{-}= O _3< O _2$
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$(i)\, EMF$ of cell = (Oxidation potential of anode) $-$ (Reduction potential of cathode)
$(ii)\,EMF$ of cell = (Oxidation potential of anode) $+$ (Reduction potential of cathode)
$(iii)\,EMF$ of cell = (Reductional potential of anode) $+$ (Reduction potential of cathode)
$(iv)\,EMF$ of cell = (Oxidation potential of anode) $-$ (Oxidation potential of cathode)
Which of the above relations are correct?

