Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

Solve the following series:
AZ, GT, MN, __, YB

What has one eye, but can’t see?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

Name a key which is hardest to turn.

In which direction should the missing arrow point?

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?

If,

20 % 5 = 24

21 % 7 = 33

42 % 6 = 67

Then;

66 % 6 = ?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?