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Roasting results in the formation of oxides. But why are oxide ores are subjected to roasting?
Volatilizing roasting is a type of roasting done to eliminate volatile oxides in the presence of excess oxygen.
Match the column:    Metal    Common method of extraction  (i)  Aluminium  (a)  Electrolysis of oxide dissolved in molten Cryolite  (ii)  Iron  (b)  Roasting followed by reduction with coke  (iii)  Copper  (c)  Roasting of sulphide partially and reduction  (iv)  Zinc  (d)  Reduction of the oxide with CO and coke in blast furnace
In which type of Roasting operation does the roasting and agglomeration processes take place simultaneously?
Mr. Justin wanted to test his students' understanding of the 'nature of weekly markets from a seller's point of view'. Which of the following questions are suited to test this? i. Can a weekly market address all the needs of a family? Why or why not? ii. Compare and contrast the characteristics of a weekly market and a permanent shop. iii. Are you likely to find a well-known brand as part of a weekly market? Why or why not? iv. Can any seller increase their price a lot compared to other sellers in a weekly market? Why or why not?
Why roasting is done in the copper extraction process?
Fes|Fe2+aq∥Br2I; Br-aq| pts তড়িৎ রাসায়নিক কোষের সঠিক কোষ-বিক্রিয়া কোনটি? (Which one is the correct cell reaction of the given electrochemical cell?)
FeS প্রস্তুতিতে Fe ও S এর পরিমাণের উপযুক্ত অনুপাত কোনটি? 
Fe+S. → FeS: বিক্রিয়াটি কী ধরনের? 
FeS প্রস্তুতির জন্য প্রয়োজন -i. আয়রনii. সালফার iii. তাপ নিচের কোনটি সঠিক?