Q92 of 400 Page 195

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.

(a) In the above given question element A is sodium and element B is chlorine. Because element A is a part of common salt and also kept under kerosene where as another element B has an atomic number 17.

(b) Here element C is sodium chloride and element D is sodium hydroxide.


(c) Element C will turn the litmus solution blue. Because a basic element will turn the litmus solution blue.


(d) From the above given statement we can say the element B is a gas.


(e) The formula of the compound formed when element B reacts with an element E having atomic number 5 is EB3.



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90 Calamine ore can be converted into zinc oxide by the process of : 91 Zinc blende ore can be converted into zinc oxide by the process of : 93 A metal which exists as a liquid at room temperature is obtained by heating its sulphide ore in the presence of air.

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(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?

 94 No chemical reaction takes place when granules of a rusty-brown solid A are mixed with the powder of another solid B. However, when the mixture is heated, a reaction takes place between its components. One of the products C is a metal and settles down in the molten state while the other product D floats over it. It was observed that the reaction is highly exothermic.

(a) What could the solids A and B be?


(b) What are the products C and D most likely to be?


(c) Write the chemical equation for the reaction between A and B leading to the formation of C and D.


(d) What is the special name of such a reaction? State one use of such a reaction.


(e) Name any two types of chemical reactions under which the above reaction can be classified.