The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

The dirtier I get, the whiter I look. Who am I?

What do you answer even though it never asks you questions?

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

What is the next number in this matchsticks series riddle?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

On a charity event in Russia, Murray beat Djokovic by winning six games and losing three games.
Note: There is a total of 5 service breaks(one who serve lost the game).
Who served first, Djokovic or Murray?

What does below chemistry rebus means?