Chopra threw the spear a distance of 82.88m at the National Institute of Sports to finish well ahead of Vipin Kasana's 80.04m that bagged him a silver while Amit Kumar took the bronze with a 77.33m throw.
It was a much anticipated result for Chopra, who was taking part in his first competition since his return from Offenburg in Germany, where the 20-year-old had been training with Werner Daniels.
After a three month stint, Chopra has since returned to the national camp where he has resumed training with former world record holder Uwe Hohn.
Toor finished ahead of Naveen Chikkara who threw the put 19.08m while the bronze went to Paramjeet Singh who only managed 16.74m.
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Two athletes also join Chopra in meeting the AFI qualifying guidelines for the Commonwealth Games. Long jumper Nayana James and womens discus thrower Navjeet Dhillon also managed to meet the minimum requirement.
James, carried on from the form that saw her winning silver at the Asian Indoor Championships by claiming gold in Patiala with a best jump of 6.47m. She finished ahead of Nina Pinto who cleared 6.41m. Purnima Hembram also managed to step on the podium with a best effort of 5.99m.
Also coming close to the qualifying guideline was triple jumper Rakesh Babu. The Kerala jumper managed a best of 16.59m coming a centimeter short of the AFI standard of 16.60m.
However, Babus effort was good enough to win gold, edging past Commonwealth bronze medalist Arpinder Singh who managed a best of 16.45m. National record holder Renjith Maheshwary finished third with a jump of 16.09m.
Amongst the other bright performers of the day were MP Jabir who claimed the 400m hurdles gold with a time of 50.60seconds, just shy of his personal best of 50.22m. Jabir finished ahead of Santhosh Kumar (50.85 seconds) and Binu Jose (52.77seconds).
Teenager Hima Das too gave a strong account of herself with a personal best timing of 11.74 seconds in the womens 100m race. Das took silver behind gold medalist Dutee Chand who clocked 11.57 seconds.