How can you make number one disappear by adding something to it?

What is the longest word in the dictionary?

What is the next number?

77, 49, 36, 18 ?

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

John was drowned by he was not wet. How?

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

The more it dries, the wetter it becomes. Can you tell what it is?

I am a prime number.
The double of myself is equal to the square of me.

which number 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?