What does below chemistry rebus means?

2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls. How do they do it?

What seven-letter word has hundreds of letters in it?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

An apple seller is hosting a competition. He offers 1000 apples and 10 boxes to the people who pass by. The challenge is to put those 1000 apples in the 10 boxes in such a manner that if he asks for any amount of apples, the person can directly give him the boxes or a combination of boxes. If the person can do it, he promises to give a thousand apples for free.

If you happen to pass by the apple seller, will you be able to win a thousand apples?

Which is heavier: a ton of bricks or a ton of feathers?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

A generous owner of a company decided to give a bonus of $45 to every man and $60 to every woman on his birthday. But only one-ninth of the men and one-twelfth of the women were present to take the bonus.

Can you calculate the amount of money the owner spent if there were 3552 employees?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.