What does below chemistry rebus means?

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

A sea diver is a real show-off. He showed everyone that he can hold his breath underwater for 15 minutes.

I went to the diver and told him that I can be underwater for double the time i.e 30 minutes.
He responded that he will give me 100$ if I would be able to do it. I won 100$.

What did I do?

Can you name an animal whose killing cannot be performed without spilling your own blood?

Can you divide numbers from 1 to 9 (1 2 3 4 5 6 7 8 9) into two groups so that the sum of the numbers of each group is equal?

Note: 9 cannot be turned over to make it 6.

I have Rs.50 and I spend it in the way as below.

Which flower has two lips?

The below mentioned letters have been placed in a order using a logic.

DEAD, BALL, FEAR, SHOP

Can you find the logic?

Find the next number in the sequence

1, 2, 6, 21, 88, __?

What has no start, end, or centre?