What are the various steps involved in the extraction of pure metals from their ores? Minerals that contain a high percentage of metal from which it can be extracted conveniently and economically are called ores.Īll ores are minerals but all minerals are not ores.
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Naturally occurring substances obtained by mining which contain the metals in a free state or in the form of compounds like oxides, sulphides etc. What is the difference between minerals and ores? (b) The graph for the fonnation of CO 2 is a straight line almost parallel to free energy axis. (d) Positive slope of metal oxides shows that their stabilities decrease with increase in temperature. (c) Negative slope of CO shows that it becomes more stable with increase in temperature. (b) The graph for the formation of CO 2 is a straight line almost parallel to free energy axis. Deviation occurs when there is a phase change. (a) Free energy changes follow a straight line. Which of the following is not truc with respect to Ellingham diagram? Which of the following reduction is not thermodynamically feasible? In the Ellingham diagram, for the formation of carbon monoxide Which of the following plot gives Ellingham diagram? In the electrolytic refining of copper, which one of the following is used as anode? (d) In the metallurgy of gold, the metal is leached with dilute sodium chloride solution (c) ZinC blende is concentrated by froth floatation (b) Titanium is refined by Van Arkels process The incorrect statement among the following is ……………… Which of the following is used for concentrating ore in metallurgy? The following set of reactions are used in refining Zirconium Silver is later recovered by ………………Ĭonsidering Ellingham diagram, which of the following metals can be used to reduce alumina? In the extraction of aluminium from alumina by electrolysis, cryolite is added to ………………Ĭupellation is a process used for the refining of ………………Įxtraction of gold and silver involves leaching with cyanide ion. Which one of the following ores is best concentrated by froth – floatation method? (c) Soluble impurities to infusible impurities (b) Infusible impurities to soluble impurities (d) Fe(s) + Cu 2+(aq) → Cu(s) + Fe 2+(aq)Įlectrochemical process is used to extract ………………įlux is a substance which is used to convert ……………… Which one of the following is not feasible? Wolframite ore is separated from tinstone by the process of ……………… Match items in column -1 with the items of column – II and assign the correct code: (d) Carbon and hydrogen are suitable reducing agents for metal sulphides. (c) Roasting of the sulphide to its oxide is thermodynamically feasible. (b) ∆G r° is negative for roasting of sulphide ore to oxide. (a) ∆G f° of sulphide is greater than those for CS 2 and H 2S. Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?
Which of the metal is extracted by Hall-Herold process?
The metal oxide which cannot be reduced to metal by carbon is ……………… Which one of the following reaction represents calcination? Roasting of sulphide ore gives the gas (A). Tamilnadu Samacheer Kalvi 12th Chemistry Solutions Chapter 1 Metallurgy Samacheer Kalvi 12th Chemistry Metallurgy TextBook Evalution
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Students can Download Chemistry Chapter 1 Metallurgy Questions and Answers, Notes Pdf, Samacheer Kalvi 12th Chemistry Solutions Guide Pdf helps you to revise the complete Tamilnadu State Board New Syllabus and score more marks in your examinations.
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