What does below chemistry rebus means?

Find The Missing Number In the Sequence.
6 25 64 ? 32 1

A man is found dead with a knife in his back When the investigation is done. A chair lays beside him and the forensic team finds moisture around the body.

If he committed suicide, how did he do it?

Can you replace the question mark with the correct number in the below table sequence?

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

A man has to get a fox, a chicken, and a sack of corn across a river.

He has a rowboat, and it can only carry him and one other thing.
If the fox and the chicken are left together, the fox will eat the chicken.
If the chicken and the corn are left together, the chicken will eat the corn.

How does the man do 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?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

Count the number of triangles in the given picture.