What do you think with the below Picture ?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

What number divided by 4 is the same as that number minus 4?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

Its something that each of us devours,
Not just us but birds, beats, trees, and flowers,
Frets iron and nibbles steel,
Toil hard stones to meal,
Exterminates king, collapse town,
And blows the mountains down.

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

How many times in a given day, minutes and hour clock comes in a straight line ?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

In the picture that is attached with this question, you can find a square which comprises of four little squares inside it. Consider this square to be made with matchsticks. You have to remove two matchsticks such that only two squares remain instead of five.How will you do it ?

With the help clues provided in the image, can you find the 5 digit key?