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  • (a) Name two metals which are obtained from their ores by simple heating. (b) Differentiate between calcination and roasting, taking examples of zinc ores. (c) What is thermit reaction ? State its significance.   <di

(a) Name two metals which are obtained from their ores by simple heating.
(b) Differentiate between calcination and roasting, taking examples of zinc ores.
(c) What is thermit reaction ? State its significance.

 

 

 

 
 
 
 
 

Answers (1)

(a) Copper, Zinc are present in their oxides - By simple heating of their ores we can obtaine metal.

(b) 

Calcination Roasting
(1) The ore is heated in the absence of air (1) The ore is heated in presence of air.
(2) This is used for carbonate ores

(2) This is used for sulphide ores.
(3) ZnCO_{3}\overset{\Delta }{\rightarrow}ZnO+CO_{2} (3) 2ZnS+3O_{2}\overset{\Delta }{\rightarrow}2ZnO+2SO_{2}

(c) Thermit reaction is a reduction of iron oxide to form iron by using highly reactive metal like luminium. Thermit reactions are highly exothermic. Fe_{2}O_{3}+2Al\rightarrow 2Fe+Al_{2}O_{3}+Heat

It is used for welding, often used to join railway trucks.

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Sumit Saini

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