Internet IQ tests are for stupid people who think 20 questions will tell how smart they are. The real IQ test takes hours... some may take even days. But IQ is just a number. It may tell how smart you are, but smart is something you don't always need in chess. A guy who has no creativity but an IQ of 180 could lose to a guy who is creative and resourceful enough and has a lower IQ.
IQ is just another way to label us. To put us on neat little categories and judge us by that.
I think A good IQ is only one of the many skills necessary to excel in Chess, the sameway an Ace Soccer player has to have a good physique. But the physique alone cannot make you a good soccer player. You need something else. The Artistic side of it!