What does this rebus means ?

PROG WORKRESS

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

What is always in front of you but can’t be seen?

What can you see in the middle of March and April that you can never see in any other month?

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?

Thirty friends were on a hiking trip when they decided to enjoy the bonfire. They assembled for it and agreed to play a game. For that, they divided themselves into five teams with seven members each, forming five rows.

How did they manage to achieve this formation?

Take away the whole and some still remain. What is it?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

What does below chemistry rebus means?

Eight of us go fourth, not back, to protect our king from an attack. What are we?