Which one is heavier 100 kg cotton or 100kg iron when immersed in water?how?

1 kg of cotton and iron are weighed in vacuum, then

The ratio of 10kg to 100kg is 1:10

A heavy ball weighing 5 N displaces 100 ml of water when immersed in water. Calculate the apparent weight of the ball in water.

You have a bag of cotton and an iron bar, each indicating a mass of 100 kg when measured of a weighing machine. In reality, one is heavier than the other. Can you say which one is heavier and why?

Which is greater - the attraction of earth for 1 kg of iron or attraction of 1 kg of iron for the earth ? Give reason.

Which contains more heat, 1 kg of water at 100^(@)C or 1 kg of steam at 100^(@)C ? Give reason for your answer.