What does below chemistry rebus means?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

Can you count the number of triangles in the given figure?

Chocolate costs 6 rupees and a Toy costs 5 rupees. If you have 32 rupees in total, how many chocolates and how many Toys can be purchased with that amount?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

Which country gets ill every time?

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?

Prove that the below maths equation is true.

8 + 8 = 91