Name the method used for isolation of noble gas mixture from air.

Name the method used for concentration of sulphide ores.

Name the method used for refining of zirconium.

Describe Ramsay and Rayleigh's method for the isolation of a mixture of noble gas from air.

Name the separating method used for the separtion of glycerol from spent lye.

Carbon cannot be used to reduce the oxide of sodium, magnetsium, calcium, etc.to their respective metals. State the method used for obtaining these metals from their salts. For obtaining sodium from its compound. a. Name the salt used, gas produced, and the electrode at which the metal deposits. b. Show the chemical reaction taking place during the process. c. Name any two other metals which can be obtained from its compounds by the above method.

In Ramsay and Rayleigh's isolation of noble gases from air,the nitrogen of the air is finally converted into

Name the method used to refine semiconducting metals.

Name the method used to determine the nature of charge on colloidal particles.