Dont worry mate. Follow these steps carefully:
It happened to me when i was connecting my adapter on my extansion. So Listen Carefully.
1) Its absolutely normal. Its hot because obviously eletricity is passing from it.
2) Dont connect the adapter on an extansion. It damages it.
3) Dont use the iPad when charging. When using it, it will take a LOT of time to charge. That way, when it will reach 100 it will stay on for a long time.
4) When the iPad arrives at 95% it will cool down. Dont worry!
Final step: Follow these steps and goodluck!
PS : If it keeps on insisting, Visit and apple store in your town and tell them to make a replacement. My friend made one for 20 dollars. Cheap.