Dear Raj,
First of all congratulations for getting those colleges. Speaking collegewise, NIT Nagpur has the upper hand as it is an older college and is in direct control of the central government. The NIRF ranking 2019 for NIT Nagpur is 31 whereas for KJ Somaiya it is 182. You will also get more no. of oppurtunities and exposure in NIT. Companies prefer top NITs over CFTIs when it comes to placements. Speaking of the branches, electrical engineering has higher placement record than chemical and civil engineering. It also opens many paths to research. But, you should analyze your area of interest in each of the branches. Go throught the syllabi, current technological updates, working environments for each of the branches. If you are deeply interested in electrical then there will be no harm in choosing KJ Somaiya. Otherwise, NIT Nagpur will be better. All the Best!
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