Hard simple riddles with simple answers

It's red, blue, purple and green. No one can reach it, not even the queen.

What you cannot hold it but it is yours?

What has a foot on each side and one in the middle?

Die without me, Never thank me. Walk right through me, Never feel me. Always watching, Never speaking. Always lurking, Never seen.

I build up castles. I tear down mountains. I make some men blind, I help others to see. What am I?

What does the following represent? N N N N N N N A A A A A A A C C C C C C C

I am always will be coming, but I will never come. What Am I?

Whoever makes it, tells it not. Whoever takes it, knows it not. Whoever knows it, wants it not.

I am something to make you think, I am something to make you know. I am something to which the answer you might never know. What am I?

When you do know me about me, them I am definitely something. You will always search for me. But when you know me, I am nothing. Who am I?