Which exchangess? Most of the US based ones, like Coinbase & Gemini will close your account if they think funding is coming from a mixer. There are lots of discussions about that happening here and on many other sites.

Other ones, in other parts of the world, who knows. Depends on their mood and how much BTC.

Also, if you are not doing a straight BTC -> fiat exchange may be a bit less strict. Where some others, really don't care at all.

As for if it's from a mixing transaction or not. Depends who you ask: https://bitcointalk.org/index.php?topic=1935098.msg58313016#msg58313016

-Dave