I dont know about comsats isb but at comsats LHR electrical engineering is offered without chemistry.
if you are considering bahria, air etc. then UCP is a damn good choice their engg departments are going to improve rapidly in the coming years as they have secured top faculty from reputable universities like fast.
As for NUST i dont think they do chem for their electrical engg either my cousin has done his degree from there, i'll ask him and post