Hello Shrabani, 

If you wish to apply for bachelor's in chemistry then you would firstly like to consider your percentile in 10+2 qualifying examinations since B.Sc in chemistry is a merit based course. For pursuing the course you can look into Tue following colleges from your state. 

1- Presidency University, Kolkata

2- Jadavpur University

3- Adamas University

4- JIS University

5- The Heritage College

6- Sister Nivedita University

7- Techno India University

8- Scottish Church College

9- Bethune College

10- Ramakrishna Mission Residential College

In case you would like to broaden your education to other states you can apply at other colleges as well at other places like-

• St. Stephen's College, New Delhi

• Banaras Hindu University, Uttar Pradesh 

• Gargi College, New Delhi

• Guru Nanak College, Chennai

• Hindu College, Delhi University

• Loyola College, Chennai

• Madras Christian College, [MCC] Chennai

• St Xaviers College, Mumbai

• Kishinchand Chellaram College of Arts, Commerce & Science, [KCCACS] Mumbai

I hope this helps