What does below chemistry rebus means?

A Man gave one of his sons 10 cents and another son was given 15 cents. What time is it?
Hint: Figure out the relation between time and number, is not so easy..:)

If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

Suppose you are sitting in an interview and the interviewee asks you an aptitude question.

You have three buckets with a capacity of 4 litres, 8 litres and 10 litres and you have a large tank of water. Now you have to measure 3 litres of water precisely using those buckets. How will you do it?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

The ages of a father and son add up to 66.
The father's age is the son's age reversed.
How old could they be?
(3 possible solutions).

The more it dries, the wetter it becomes. Can you tell what it is?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?