In which of the following method of purification metal is converted to its volatile compound which is decomposed to give pure metal?

Which of the following is not a method of purification of metals ?

Which of the following is not a method of purification of metals ?

In which of the following purification methods, the metal is first converted into its volatile compound and then it is decomposed to give the pure metal-

Which of the following is not used to purification of a metal ?

Which of the following method is used for purification of metals containing high boiling impurities ?