Hybridisation of nitrogen species

2016 Phase II 1 question

1. 1 Chemical Bonding and Molecular Structure
   The hybridizations of atomic orbitals of nitrogen in $NO_2^+$, $NO_3^-$ and $NH_4^+$ respectively are
   A sp, $sp^2$ and $sp^3$ B $sp^2$, sp and $sp^3$ C sp, $sp^3$ and $sp^2$ D $sp^2$, $sp^3$ and sp
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