Zinc refining is a method to obtain

• Very high temperature

• Ultra pure Al

• Ultra pure Germanium
• Ultra pure oxides

Electrochemical process (electrolysis of fused salt) is employed to extract:

• iron

• lead

• sodium

• silver

In electro refining of metals, the pure metal is made the anode and a strip of pure metal the cathode during the electrolysis of an aqueous solution of a complex metal salt. This method cannot be used for refining of

• Silver

• Copper

• Aluminium

• Zinc

• infusible impurities to fusible material

• soluble impurities to insoluble impurities

   
• fusible impurities to infusible impurities
• mineral into silicate

The method of zone refining of metals is based on the principle of

• higher melting point of impurity than that of the pure metal

• greater noble character of the solid metal than that of the impurity

• greater solubility of the impurity in the molten state than in the solid.

• greater mobility of the pure metal than that of the impurity.

Name a method to get titanium metal in the pure state.

118.

What type of ores are dressed up by magnetic separation method?

Name two metals which occurs native(free) in nature.

Define the term mineral.