What does the below rebus riddle means?

What word begins and ends with an E, but has only one letter?

There is something which is always coming but never arrives?

What has 13 hearts but no other organs?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

What is next number in the pattern below:

131 517 192 123 ?

Spot what is wrong here in below Picture?

You board a train. The train will have to enter a tunnel soon. You are claustrophobic. Which place is the best for you to sit?

Given that

(78)^9 = 6
And (69)^4 = 11

Can you find out

(99)^2 =?

(Note: This is Logical, not Mathematical)

Can you count the number of quadrilaterals in the picture below?