What does below chemistry rebus means?

Which alphabet letter is a question?

There are forty elephants and they have forty-fore heads. How can this be possible?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

Name the three-letter word that can complete the below words?

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

Can you find the hidden animal in the picture below?

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?

You can hear me, but you can't touch or see me.

What am I?