Browse by Stream
QnA
Home

Get Answers to all your Questions

header-bg qa
  • Home
  • School
  • (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.

Posted by

Sumit Saini

View full answer

Similar Questions

Trending Articles/News

anam-khan

CBSE Result 2025: DigiLocker access code out; schools to download for Class 10, 12 students
anam-khan

CBSE Class 10, 12 result process revised; answer book photocopy now comes before re-evaluation
anam-khan

CBSE Class 10 result 2025 not expected this week, 'confirms' Board amid ruckus over result date

Latest Question