Skipper Kohli hit an unbeaten 76 and opener Mukund (81) put on 133 for the 3rd wicket to stretch India's lead to 498 before rain halted play.
Earlier, Sri Lanka's overnight pair of Angelo Mathews and Dilruwan Perera added 51 runs off 88 balls. Mathews went for 83 after a loose stroke.
Perera was stranded on 92 after a clatter of quick wickets.
India 600 and 189/3 (Abhinav Mukund 81, Virat Kohli 76*; Danushka Gunathilaka 1/15) lead Sri Lanka 291 (Dilruwan Perera 92*, Angelo Mathews 83; Ravindra Jadeja 3/67) by 498 runs.
Matches Tagged in ClipDex2017 SRL v IND 1st Test
Series Tagged in ClipDex2017 SRL v IND Test serie ...
Players Tagged in ClipDexPerera, M Dilruwan K Pandya, Hardik H Kohli, Virat Mathews, Angelo D Mukund, Abhinav Kumara, C B R Lahiru S Ashwin, Ravichandran Jadeja, Ravindra A Yadav, Umesh
Grounds Tagged in ClipDexGalle International Stadi ...
Categories Tagged in ClipDexTest Matches