Answer :

(a) When zinc carbonate is heated in the absence of oxygen, zinc oxide and carbon dioxide are produced. The process of reduction carbonate ores to form oxides in absence of oxygen is called calcination. Zinc is found in its ore – zinc carbonate. When this ore is heated, zinc oxide is formed along with carbon dioxide.


ZnCO3 ZnO + CO2


(b) When a mixture of copper oxide and copper sulphide is heated, pure copper is obtained. It undergoes auto reduction. When sulphide ore of copper is heated, a part of this ore is converted into oxide which then reacts with remaining sulphide ore to give pure copper and sulphur dioxide.


2Cu2O + Cu2S 6Cu + S


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
History - Concept and QuestionsHistory - Concept and QuestionsHistory - Concept and Questions57 mins
Revision on Substitution and  Elimination MethodRevision on Substitution and  Elimination MethodRevision on Substitution and Elimination Method44 mins
Trigo Marathon Part 2Trigo Marathon Part 2Trigo Marathon Part 245 mins
Arithmetic Progression and 'nth' Term of APArithmetic Progression and 'nth' Term of APArithmetic Progression and 'nth' Term of AP55 mins
Heights and Distances - IHeights and Distances - IHeights and Distances - I54 mins
Heights and Distances - IIHeights and Distances - IIHeights and Distances - II45 mins
Trigo Marathon Part 1Trigo Marathon Part 1Trigo Marathon Part 146 mins
Application of Trigo Important QuestionsApplication of Trigo Important QuestionsApplication of Trigo Important Questions44 mins
Economics - Concept and QuestionsEconomics - Concept and QuestionsEconomics - Concept and Questions59 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses
RELATED QUESTIONS :

i. What is observXam idea - Science