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

Explain the formation of hydrogen molecule.

Explain what happens when acetylene is treated with ammonical solution of silver nitrate?

What happens when CH_3 Br is treated with AgCN?

What happens when: Ethoxy benzene is treated with HBr.

What happens, when- Methoxyethane is treated with excess HI.

When Conc. H_2SO_4 is treated with chloride salt, a colourless pungent smelling HCl gas is produced, but when the same acid is treated with Bromide salt we get red vapour of bromine Explain.

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