Hey, thank you for contacting us. For Msc Chemistry in IIT Hyderabad, you do not need to write any exams other than their entrance exam. After which they will call for an interview if you get through the exam. It is as simple as that. The entrance exam is held in different parts of the country. you should look up to their website for more details. I hope this helped. 

https://www.iiit.ac.in/admissions/postgraduate/

Best Wishes