Q1.What is the process called when sulphide ores are converted into oxides by heating strongly in the presence of excess air?

Q2.Which reducing agent is commonly used to reduce metal oxides to their corresponding metals, as exemplified by the reduction of zinc oxide?

Q3.Obtaining metals from their compounds is fundamentally what type of chemical process?

Q4.Which of the following highly reactive metals can be used as a reducing agent in displacement reactions to obtain metals from their oxides?

Q5.In the process of electrolytic refining, where is the pure metal deposited?

Q6.What are the insoluble impurities called that settle down at the bottom of the anode during electrolytic refining?

Q7.During electrolytic refining, what happens to the soluble impurities?

Q8.Why do silver articles turn black after some time when exposed to air?

Q9.What is the green substance that forms on copper when it reacts with moist carbon dioxide in the air?

Q10.What is the brown flaky substance that forms on iron when it is exposed to moist air for a long time?