Which of the following has largest bond angle?

{N O}_{2}^{+}

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{N O}_{2}

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{N O}_{2}^{-}

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{N O}_{3}^{-}

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Solution

The correct option is A ${N O}_{2}^{+}$
In ${N O}_{2}^{+}$ molecule, there is no lone pair, only bond pair are present. So the molecule is linear & so the bond angle is $180 °$ .
While in ${N O}_{2}^{-}$ & ${N O}_{2}$ , we have one lone pair on nitrogen & one lone electron respectively which cause repulsion leading to angle less than $180 °$ . In ${N O}_{3}^{-}$ , the bond angle is $120 °$

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