I don't think those are unreasonable at all for a 12 y/o....my kids don't get an allowance, but when they do something extra {like wash the car/pick weeds/paint ...yes my DD is 18 and needs her bathroom painted} we give them alittle extra cash....the way it works here is we really just reward the kids later down the road for being good....the little ones sometimes will get a movie or somethign and Ben will get Yugio cards or something of that nature...the oldest usually gets some extra clothes that aren't budgeted in and we give her some cash every now and then when needed....
Sam {18}...dishes/clean kitchen every few days/do the floors/her bathroom/her bedroom/cat box/feed the cat/babysit when needed/does her laundry if I am already done
Ben {10}...recycles/his room/toliets
Abby {5}..cleans her room and helps with her little brothers room/makes her bed/helps Sam do the dishes/and she can fold the towels and loves to do it!
Peyton {4}....cleans his room with a little help/makes his bed/picks up toys upstairs and downstairs/also loves to help with the dishes
I am picky about the vacuuming and all the laundry so I do that myself