Logic Riddles

Question: A natural state, I'm sought by all.
Go without me, and you shall fall.
You do me when you spend,
and use me when you eat to no end.

What am I?

Question: You get trapped in a psycho's mansion during a power outage. You try to get out by going through a series of rooms: the first one is blue, the second one is also blue, but the third one is golden. After you go through all of these rooms you find the psycho. He tells you that you must hold your breathe under water for 10 minutes, wrestle a large bear, or sit in the electric chair for ten seconds while it is on.

Which should you choose?

Question: How do you make the number one disappear by adding to it?

Question: How many letters are in the answer to this riddle?

Question: I'm number three.
But I'm not a number.
I'm hot and cold at the same moment but not at the same time.
I'm number three.
But I'm not a number.

Who or what am I?