Q9 of 11 Page 108

Explain what is anode mud.

The impurities which settle at the bottom of anode as a result of electrolysis, which contain costly metals are called as anode mud.

This can be considered as a deposit of insoluble residue formed from the dissolution of anode in commercial electrolysis. For ex – in copper refining we get anode mud which contains little gold.



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7

Explain the process of producing alumina from bauxite.

 8

Explain the method of obtaining pure aluminium from alumina by electrolysis. In this process the carbon rods are replaced from time to time. Why?

 1

Which of the properties of metals is utilized in the following instances?

- Aluminium utensils are used for cooking.


- Copper is used for making vessels.


- Gold wires are used in ornaments.

 1

You know that metals can be separated from molten compounds of metals by electrolysis.

Find out how metals like Na, Ca and Mg are extracted