Formal Charges of CNO-?

Question

Explosive charges containing TNT (trinitrotoluene) do not explode when subjected to mechanical shock, but they do explode violently when detonated properly. The most common type of detonator is a blasting cap containing mercury fulminate, Hg(CNO)2, which does explode when struck. Draw the correct Lewis structure for the CNO- anion, and for the optimum structure decide which of the following statements about formal charge are true. Enter the correct choices in alphabetical order, e.g. ACF, ABDF, etc.
A) FCC=0
B) FCC=+1
C) FCC=-1
D) FCC=-3
E) FCN=-1
F) FCN=+3
G) FCN=0
H) FCN=+1
I) FCO=-1
J) FCO=-3
K) FCO=0
L) FCO=+1

Thank you!

Answer 1

In the fulminate ion, nitrogen forms a triple bond with carbon and a single bond with oxygen. The formal charges are FCC = -1, FCN = +1, and FCO = -1, so the correct answer is CHI.

Answer 2

Cno Lewis Structure

Answer 3

http://en.wikipedia.org/wiki/Fulminate