Question

I need to draw a Lewis Dot Structure for each ion or molecule:

PO4-3
CN-
SO3-2
ClO2-

N2H2
N2H4
C2H2
C2H4

Answer 1

We can't draw these on this forum; however you can google each (example: lewis dot structure PO43-) and find mos of them.
CN^- is
:C:::N:^-

Answer 2

I am unable to draw the label for CN, I tried to make a triple bond between C and N, then place two electrons for each, but I was incorrect.

Answer 3

I drew the CN^- above. It shows the triple bond as three sets of a pair of electrons. Note the - sign at the top as a superscript.