Bay of Bengal is in which state?

Replace the question mark with the number below given a simple math problem.

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

As we know that white starts the game of chess. Can you find the scenario shown in the picture below is possible when all the white pieces are at the original place while the black pawn is not as in the below picture?

Move four matchsticks to the below square to form three squares?

You’re out on the water and see a boat filled with people. You look away for a second and look back again, but this time you don’t see a single person on the boat. Why? Hint: The boat did not sink.

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

Can you make four (4) nines (9) equal 100?

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?

First, think of the colour of clouds. Next think the colour of snow. Last, think of the colour of the moon. Now, what do cows drink?