Q43 of 52 Page 82

Give two requirements for vapour phase refining.

In vapour phase refining method, the impure metal is converted to a volatile complex which on decomposition gives the pure metal. The two basic requirements for refining a metal by vapour phase method:

(i) The metal should be react easily with the reagent to form the complex.


(ii) The volatile complex should easily decomposable so that the recovery is easy.


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41

How are metals used as semiconductors refined? What is the principle of the method used?

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Write down the reactions taking place in Blast furnace related to the metallurgy of iron in the temperature range 500-800 K.

 44 Note

Write the chemical reactions involved in the extraction of gold by cyanide process. Also give the role of zinc in the extraction.

 45

Match the items of Column I with items of Column II and assign the correct code:

Code :


A. A (1) B (2) C (3) D (4)


B. A (2) B (4) C (5) D (3)


C. A (2) B (3) C (4) D (5)


D. A (4) B (5) C (3) D (2)