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# The statement true for $N_3 ^{-}$ is :

$(a)\;\text{it has a non linear structure } \\ (b)\;\text{it is called pseudohalide ion} \\(c)\;\text{the formal oxidation state of nitrogen in this an ion is -2} \\(d)\;\text{it is isoelectronic with$CO_2$}$

Axide ion is linear .
It is a pseudohalide ion.
The formal oxidation state of N in $N_3^{-}$ ion is $-1$ because in any of the resonating structure, the net charge on the ion is $-1$.
No of electrons in $N_3^{-}$ and $CO_2$ are 22.
Hence c is the correct answer.