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Revision Notes for Class 12 Chemistry Unit 06 General Principles and Processes of Isolation of Elements
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Unit 06 General Principles and Processes of Isolation of Elements Notes Class 12 Chemistry
(1 mark)
A.1. It is easily fusible material, which is formed when gangue still present in roasted ore combines with the flux. e.g. CaO (flux) + SiO2 (gangue) → CaSiO3 (slag)
Q.2.Name the metals which can be refined by zone refining.
A3.Silicon, Germanium, Gallium.
Q.3.What is the principle of chromatography?
A3. It is based on adsorption
Q.4. What is the role of graphite rods in electrometallurgy of aluminium?
A.4. Graphite rods act as anode, are attacked by oxygen to form CO2 and sois replaced from time to time.
Q.5. What is the role of cryolite in electrometallurgy of aluminium?
A.5. Alumina cannot be fused easily because of high melting point. Dissolving of alumina in cryolite furnishes Al3+ ions, which can be electrolyzed easily.
Q.6. What are depressants?
A.6. It is possible to separate two sulphide ore by adjusting proportion of oil to water in froth flotation process by using a substance known as depressant.e.g. NaCN is used to separate ZnS and PbS.
Q.7. Copper can be extracted by hydrometallurgy but not Zn. Why?
A.7. The E0 of Zn is lower than that of Cu thus Zn can displace Cu2+ion from its solution. On the other hand, to displace Zn from Zn2+ion, we need a more reactive metal than it.
Q.8. Give name and formula of important ore of iron .
A.8. Haematite – Fe2O3, Magnetite –Fe3O4, Iron pyrites FeS2.
Q.9. Give name and formula of important ore of copper .
A.9. Copper pyrites CuFeS2, Malachite CuCO3 . Cu (OH)2, Cuprite Cu2O.
Q.10. Give name and formula of important ore of Zinc .
A.10. Zinc blende ‐ ZnS, Calamine‐ ZnCO3, Zincite – ZnO
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CBSE Class 12 Chemistry Unit 06 General Principles and Processes of Isolation of Elements Notes
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