What does the below rebus riddle means?

What seven-letter word has hundreds of letters in it?

Take one out and scratch my head, I am now black but once was red. What am I?

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?

When it's bad luck to meet a black cat?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

A man was gazing through the window of the 23rd floor of the building. He suddenly opened the window and jumped on the other side of the window. On landing on the floor, there was not a sheer mark of injury on him.

How can that be possible if he did not use any kind of parachute and did not land on a soft surface?

Can you name some countries which do not have the alphabet 'A' in them?

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?

Decode this picture on T-Shirt and tell what it says ?