What does below chemistry rebus means?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

What is both possible and impossible at the same time?

10+10 and 11+11 can give you the same answer.

Explain how?

What does this Rebus Picture mean?

Replace the 'X' with any mathematical symbol to make the expression equal to 111.

18 X 12 X 2 X 3 = 111

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

Buy me, smell me or deliver me, I do not change.

Who am I?

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?

On a special event at the prison, 5 prisoners John, Jacob, Krist, Tang, and Dang given a chance to go to a sauna and can bring one thing with them.

Following are the things that the prisoners bring with them.
John: A soda
Jacob: Thermos
Krist: Book named "How to kill"
Tang: A Walkman
Dang: Harmonica

Since it is a Sauna, no one can see each other. After a while When the steam is switched, Tang was found dead and there was blood all around.
J Bond was called and he instantly come to know who can be the murderer. How?