Logic Riddles

Question: What disappears as soon as you say it?

Question: Can you make VI out of IX?

Question: Spell "Hard Water" using only 3 letters.

Question: You were asked to label the light switches for your company. You are in a room, with unlabeled light switches. There are 3 of them, and there are 3 lightbulbs in the next room. You can not travel back and forth. How do you successfully label the lightbulbs???

Question: what is ready when you add a letter inside?