What does below chemistry rebus means?

Can you solve the below geography rebus by decoding the below rebus ?

If one and a half boys, eat one and a half burgers in one and a half hours.

How many burgers can 9 boys eat in 3 hours?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

It's pretty hard to give up.
If you remove a part of it, you will be left with a bit.
Even if you remove another part, the bit still remains.
Remove one more and it still remains.

What is it?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

You have two bottles of pills marked with labels A and B. The pills are identical. The doctor has asked you to take one A pill and one B pill daily. You cant take more or less than that.

While taking out the pills one day, you took out one pill from A and by mistake took out two from B. You have no idea which pill is which now.

You cant throw away the expensive pills. What will you do now?

What month of the year has 28 days?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?