Which alphabet letter is a question?

What does this mean?

CCCCCCC

I have no life, but I can die. What am I?

Solve the riddle below:

If a Chicken says, 'All chickens are liars" is the chicken telling the truth?

An evil man kidnapped someone and made them take one of two pills. One was harmless, but the other was poisonous. Whichever pill the victim took, the kidnapper took the other one. The victim took their pill with water and died. The kidnapper survived. How did the kidnapper get the harmless pill?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

Before the start of the car race, John and Jacob have the same amount of fuel in their car. With this fuel, John can drive for 4 hours while Jacob can drive five hours.
After a time they realize that the amount of fuel left in John's car is 1/4th of the fuel in Jacob's.

For how long they are racing?

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

Can you find the key in the picture below?

Can you identify the hidden rebus in the image below?