What is the longest word in the dictionary?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

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.

Out of four images which one is the odd one out?

A prisoner is told: "If you tell a lie, we will hang you and if you tell the truth, we will shoot you." What did the prisoner say to save himself?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

What 5-letter word typed in all capital letters can be read the same upside down?