Arindam batted through the day to remain unconquered on 139 as he shared a 129-run opening stand with left-hander Rohan Banerjee, who made a sedate 42.
Arindam faced 260 balls during the day in which he hit 11 fours and a big six of offie Koteshwar Rao.
The opening stand lasted for nearly 55 overs before a freak run out ended Banerjee's stay at the wicket. He faced 169 balls and hit four boundaries.
He was patient to wait for the loose deliveries. A couple of cover drives off Irfan Khan and a straight drive off Suraj Yadav were the stand out shots. The 100 came off 186 balls with a deft late cut off Irfan to deep thirdman boundary.
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This is his second century of the season and 10th of his career. Once he reached the century, Arindam asked the scoreboard operator to take off his scores.
"I just got out after scoring 100 in the match against Madhya Pradesh. It was a kind superstition that I would get out. I am happy with the score. We need to get to 450 at least. The pitch is getting lower and slower and there will be a bit more turn," Arindam told reporters after the end of day's play.
Wriddhiman Saha (21) got a raw deal when he was adjudged leg before to a delivery from Irfan that pitched well outside off stump.