Is C2- paramagnetic or dismagnetic
The term "dismagnetic" is not commonly used in the field of magnetism. Therefore, it is likely that you meant to ask whether C2- is diamagnetic or paramagnetic.
C2- refers to the carbon dianion, which has a total of 14 electrons. In the molecular orbital diagram of C2-, there are 10 bonding electrons and 4 antibonding electrons. The presence of unpaired electrons in the molecular orbital diagram indicates that C2- is paramagnetic.