Explain the formation of hydrogen molecule.

Explain the formation of scum when hard water is treated with soap.

With the help of suitable diagram, explain the formation of depletion region in a p-n junction. How does its width change when junction is forward biased

The atomic mass of hydrogen

Explain the following observations: hydrogen fluoride has a much higher boiling point than hydrogen chloride.

At what temperature the velocity of hydrogen gas molecule becomes twice at normal temperature and pressure.

Discuss the factors which influence the formation of ionic comounds.

Name the two amino acids involved in the formation of amides in plants.