Yes, you can take IT in BIT Sindri easily with a common merit rank in JCECE. In usual circumstances, a candidate can even get Chemical Engineering in the second round of counseling. 

The table below shows the cut-off ranks in JCECE for BIT, Sindri for different categories - 

A score of 90+ is considered to be enough to get a good branch in BIT Sindri, for general category students.