IMAT 2013 Q50 [Nitrogen Compounds]

The following are some compounds of nitrogen:
NOCl, KNO_2, NO_2, NO_2Cl, Ca(NO_3)_2

A. 3, 4, 5, 6
B. 2, 3, 4, 5
C. 2, 3, 4, 5, 6
D. 4, 5, 6
E. 3, 4, 5