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GENERAL PRINCIPLES OF METALLURGY
Study Material
GENERAL PRINCIPLES OF METALLURGY
Very Short Answer Questions
Q1. What is the role of depressant in froth floatation?
Q2. Between $\ce{C }$and $\ce{CO}$ which is a better reducing agent at 673 K?
Q3. Name the common elements present in the anode mud in the electrolytic refining of copper.
Q4. State the role of silica in the metallurgy of copper.
Q6. Describe a method for the refining of nickel.
Q7. How is cast iron different from pig iron?
Q8. What is the difference between a mineral and an ore?
Q9. Why copper matte is put in silica lined converter?
Q10. What is the role of cryolite in the metallurgy of aluminium?
Q11. How is leaching carried out in the case of low grade copper ores?
Q12. Why is zinc not extracted from zinc oxide through reduction using $\ce{ CO}$?
Q13. Give the composition of the following alloys. a) Brass b) Bronze c) German silver
Q14. Explain the terms gangue and slag.
Q15. How is $\ce{Ag}$ or$\ce{ Au}$ obtained by leaching from the respective ores?
Q16. What are the limitations of Ellingham diagram?
Q17. Write any two ores with formulae of the following metals:(a) Aluminium(b) Zinc (c) Iron (d) Copper
Q18. What is matte? Give its composition.
Q19. What is blister copper? Why is it so called?
Q20. Explain magnetic separation of impurities from an ore.
Q21. What is flux? Give an example.
Q22. Give two uses each of the following metals: (a) Zinc (b) Copper (c) Iron (d) Aluminium
Q23. Between $\ce{ C }$and $\ce{ CO}$, which is a better reducing agent for $\ce{ ZnO}$?
Q24. Give the uses of a) Cast Iron b) Wrought iron c) Nickel steel d) Stainless steel
Q25. How is aluminium useful in the extraction of chromium and manganese from their oxides?
Q1. Copper can be extracted by hydrometallurgy but not zinc-explain.
Q2. Why is the extraction of copper from pyrites more difficult than that from its oxide ore through reduction?
Q3. Explain Zone refining.
Q4. Write down the chemical reactions taking place in the extraction of zine from zinc blende.
Q5. Write down the chemical reactions taking place in different zones in the blast furnace during the extraction of iron.
Q6. How is alumina separated from silica in the bauxite ore associated with silica? Give equations.
Q7. Giving examples to differentiate roasting and calcination.
Q8. The value of $\ce{ \delta^{\circ} G }$for the formation of $\ce{ Cr2O3}$ is -540$\ce{ kJmol^{-1}}$and that of $\ce{ Al2O3}$ is-827 $\ce{ kJmol^{-1}}$. Is the reduction of $\ce{ Cr2O3}$ possible with $\ce{ Al}$?
Q9. What is the role of graphite rod in the electrometallurgy of aluminium?
Q10. Outline the principles of refining of metals by the following methods. a) Zone refining b) Electrolytic refining c) Poling d) Vapour phase refining
Q11. Predict the conditions under which Al might be expected to reduce $\ce{ MgO}$.
Q12. Explain the purification of sulphide ore by froth floatation method.
Q13. Explain the process of leaching of alumina from bauxite.
Q14. What is Ellingham diagram?What information can be known from this in the reduction of oxides?
Q15. How is copper extracted from copper pyrites?
Q16. Explain the extraction of zinc from zinc blende.
Q17. Explain smelting process in the extraction of copper.
Q18. Explain electrometallurgy with an example.
Q19. Explain briefly the extraction of aluminium from bauxite.
Q1. The choice of a reducing agent in a particular case depends on thermodynamic factor. Explain with two examples.
Q2. Discuss the extraction of zinc from zinc blende.
Q3. Explain the reactions occurring in the blast furnance in the extraction of iron.
Q4. Discuss the extraction of copper from copper pyrites.
Q5. Explain the various steps involved in the extraction of aluminium from bauxite.