What does below chemistry rebus means?

There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What colour are the stairs?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

What does this rebus mean?

O
N
C
E
TIME

One night, a man runs away from home. He turns left and keeps running. After some time he turns left again and keeps running. Later, he turns left one more time and runs back home—but when he gets home, he finds a man in a mask. Who was the man in the mask?

Can you find out which triangle will have a bigger area among the following?
1. A triangle with sides 300, 400 and 500
2. A triangle with sides 300, 400 and 700

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

What is common among 11, 69, and 88?

It belongs to you, but other people use it more than you do. What is it?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?