Dhawan was out for 68 off 65 balls, hitting a Shadab Khan full toss straight to Azhar Ali at deep mid-wicket.
After Dhawan, who smashed six boundaries and a six, departed, Virat Kohli came down with a objective.
India's openers made an initially cautious start before they upped the tempo either side of a 50-minute rain break.
Rohit Sharma led from the front scoring 91 off 119 deliveries with the help of seven fours and two sixes.
Rising on a solid foundation, the Indians finished the innings on a high with captain Virat Kohli (81 not out) and Yuvraj Singh (53).
Hardik Pandya hit the first three balls of Imad Wasim's last over of the innings for six on his way to 20 not out. Kohli had, by his standards, crawled to 46 off 58 before a six in the 45th over off Hasan Ali allowed him to find his groove.
Since then, the rain had played a spoilsport due to which the Duckworth-Lewis method was implemented and the target was revised to 324 in 48 overs.
India produced a dominant performance to hammer Pakistan by 124 runs.
Apart from Ali, Hafeez was the only Pakistan batsmen who managed to stand up to the Indian bowlers even as wickets fell at regular intervals at the other end. Kumar, meanwhile, claimed one wicket. "The enhanced security around venues implemented following the Manchester attack remains in place, this includes significantly enhanced police and security for today's match", the ICC said in a statement.
Harbhajan Singh wrote in his column for icc-cricket.com: "As far as the mind games are concerned, this is not a boxing match where you go to a press conference and talk about things".
The batsman unfortunate to miss out on a well deserved century after he was dismissed run out. Shikhar and Rohit - last time we won here, the opening partnership was crucial.
Kashmiris have been great lovers of football, hockey and cricket, but when it comes to a clash between India and Pakistan, blood pressures start rising. And Hardik, 18 off five balls, was outstanding.
"They saved some wicket resource to use up in the overs that ended up being canceled, which Team 2 doesn't need to do, therefore Team 2 has more resource to use in the same number of overs". Much of that had to do with the rain interruption which broke the flow of the batsmen.
"I was lucky I was dropped, but I capitalised and I was hitting it well".