The second leg of the final will be played at River's Monumental stadium on November 24. The match is expected to be attended by Russian President Vladimir Putin, who will be in the South American country for the 2018 G20 Summit at Buenos Aires.
It's the most explosive and combustible match in which fans have been banned from travelling to away matches since 2013 due to football-related violence that has seen 305 supporters killed in the last 50 years.
In a new format, there are no finals in track and field (with the exception of 4km cross-country) in the Youth Olympics and each event is held twice, with results from both rounds counting towards the final standings.
Chaudhary, an Asian Games and Junior ISSF World Championship gold medallist, shot 244.2 to finish on top of the podium ahead of South Korea's Sung Yunho (236.7). Switzerland's Solari Jason bagged the bronze with 215.6.