What is the formal charge on the $N$ atom in the $[S-C \equiv N:]^-$ ion?

The incorrect statement$(s)$ regarding $\overset{\bullet }{C}X_{3}$ species is:

The number of molecules or ions from the following,which do not have an odd number of electrons are $...............$.
$A. NO_2$ $B. ICl_4^{-}$ $C. BrF_3$ $D. ClO_2$ $E. NO_2^{+}$ $F. NO$

Which of the following is a Lewis acid?

Write Lewis dot symbols for atoms of the following elements: $Mg$,$Na$,$B$,$O$,$N$,$Br$.

Which of the following statements is correct?