Q91 of 400 Page 194

Zinc blende ore can be converted into zinc oxide by the process of :

Zinc blende ore can be converted into zinc oxide by the process of roasting.

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89 The metal which can be extracted from pyrolusite ore is : 90 Calamine ore can be converted into zinc oxide by the process of : 92 An element A which is a part of common salt and kept under kerosene reacts with another element B of atomic number 17 to give a product C. When an aqueous solution of product C is electrolyzed then a compound D is formed and two gases are liberated.

(a) What are A and B?


(b) Identify C and D.


(c) What will be the action of C on litmus solution? Why?


(d) State whether element B is a solid, liquid or gas at room temperature.


(e) Write formula of the compound formed when element B reacts with an element E having atomic number 5.

 93 A metal which exists as a liquid at room temperature is obtained by heating its sulphide ore in the presence of air.

(a) Name the metal and write its chemical symbol.


(b) Write the name and formula of the sulphide ore.


(c) Give the equations of chemical reactions involved in the production of metal from its sulphide ore.


(d) Name a common 'device in which this metal is used.


(e) Can this metal displace copper from copper sulphate solution? Why?