For MSc chemistry, generally all universities take their individual entrance exams. So you have to check official website of particular university in order to check about the forms and all details.

There are some All India level exams which check student's intelligence at national level. Like JAM (Joint Admission test for MSc) this exam will help you take admission in IITs, NITs, IISERs for MSc. Another exam CUCET (Central Univesities Combined Entrance Test) is for admission in few Central Universities like Central university of Rajasthan, CU Karnataka, CU Gujrat, CU Punjab, CU Kashmir, CU bihar, CU Tamil Nadu etc.

For M. Sc chemistry entrance exam in India all questions are asked on the conceptual basis so u should read more doubts with clarity.