B.Sc

Both offer job opportunities but the field is different in both. So, go in the field you are interested in.

Depends on what type of result you want.

Going for msc (chemistry) is a decent choice. She may also pursue any applied chem or bio subjects like industrial chem, analytical chem, biochem, biotech etc. After msc, she can clear ugc-net to pursue phd and compete assistant professor exams. All the best. Thank you.

Please evaluate Indian Maritime University if your PCM is 60% wih 50% in English.

There are so many opportunities for the people who completed B.Sc computer science in IT sector. You can apply for software jobs because you have learned about working and operations in software. If you are interested in doing higher studies then go for M.Sc computer science and it will help you to gain more knowledge in the domain you will work for. You can apply for a job in MNC's with B.Sc computer science degree but you should posses minimum criteria of the company you are going to apply.