Class 12 Chemistry
General Principles and Processes of Isolation of Elements
Question1.
What is pyrometallurgy?
Question2.
Discuss froth floatation process.
Question3.
Why zinc oxide be reduced to the metal by heating with carbon and not with Cr2O3?
Question4.
Describe the role of iodine in refining of titanium.
Question5.
Thomas slag is produced when –
(a) silica react with coke.
(b) limestone reacts with Nitrogenous.
(c) lime react with compound having phosphorus impurities.
(d) on heating lime with silica dust at high temperature.
Question6.
Reduction of TiCl4 by magnesium is -
(a) Thermite process
(b) Hall’s process
(c) Kroll’s process
(D) Baeyer’s process
Question7.
What is fool’s gold? Why it is not extracted from its ore?
Question8.
During the process of blast furnace we get Pig iron from zone of fusion but how will you get wrought iron?
Question9.
Write and explain the reaction involved in extraction of gold.
Question10.
Write the composition of Rolled gold and German silver.
Question11.
During the concentration of sulphide ores by froth floatation process, potassium ethyl xanthate is added. Why?
Question12.
Copper and silver lie below in the electrochemical series and yet they are found in the combined state as sulphide in nature. Comment on this fact.
Question13.
Which series of reaction correctly represents chemical reaction related to iron and its compound?
Question14.
Can Al reduce MgO at 1665K before the point of intersection on graph. Explain by Ellingham graph.
Question15.
What are refractory substances? Give example of acidic and basic refractory material?
Question16.
During electrolytic refining of copper, some metals present as impurity settle as ‘anode Mud ’ these are
(a) Sn and Ag
(b) Pb and Zn
(c) Ag and Au
(d) Fe and Ni
Question17.
The method not used in metallurgy to refine the impure metal is
(a) Mond’s process
(b) Van Arkel process
(c) Amalgamation process
(d) Zone refining
Question18.
Sulphide ores of metals are usually concentrated by froth floatation process. Which of the following sulphide ore offers an exception and is concentrated by chemical leaching?
(a) Galena
(b) Copper pyrite
(c) Sphalerite
(d) Argentite
Question19.
Which one of the following ore contains both copper and iron :
(a) Malachite
(b) Dolomite
(c) Azurite
(d) Chalcopyrites pyrites
Question20.
Match the following –
(a) Feldspar - CaMg3(SiO3)4
(b) Asbestos – Ag3SbS3
(c) Pyargyrite – FeCO3
(d) Diaspore – CuCO3.Cu(OH)2
(e) Siderite – ZnCO3
_ KAlSi3O8
– Al2O3.2H2O
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