
Uruguay international Ramirez, who was an influential figure throughout the match, broke the deadlock on the hour with a firm downward header at the back post from a Viktor Fischer corner.
Arsenal aim to extend unbeaten run against Boro
Ramirez, who had a loan spell at Hull from Southampton in the 2014/15 season, thought he had helped set up the opener for Fischer after 33 minutes but it was disallowed for offside.
The win takes the hosts up three places to 13th on 15 points from 14 games before they visit Southampton on Sunday with Hull second-bottom on 11 points as they next host Crystal Palace.
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