No idea how you are expected to tell which solutions are supersaturated in 2 - unless you are told "everything is dissolved". But you aren't.
1 looks about right.
2a is OK. bcde - check them over. Only valid answers are saturated/unsaturated IMHO.
3. Not sure where the problem is. You can read how many grams can be dissolved per 100g of water, in 200g of water you can dissolve twice as much, in 50g just half - and so on.
4. Read solubilities at different temperatures given - when you lower the temperature some of the solid has to crash out. Just subtract.
5. How many grams of KClO3 in a saturated solution at 10°C? At 30°C? How much do you miss?