Give equations for the industrial extraction of zinc from calamine.
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Name the raw materials added before smelting, in the extraction of iron ore?
Lime Stone is added to Blast Furnace before smelting.
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Food cans are coated with tin and not with zinc because (a) zinc is costlier than tin.
(c) Food cans are coated with tin and not with zinc because zinc is more reactive than tin.
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Write the reaction involved in the extraction of copper from low grade ores.
First step is leaching of ore with acid or bacteria then, Cu2+ (aq) + H2 (g) => Cu (s) + 2H+ (g)
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What is hydrometallurgy ? Give one example where it is used for metal extraction.
Leaching followed by reduction is called hydrometallurgy. It is used in extraction of copper.
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Mention the role of cryolite in the extraction of aluminium.
[Hint : It lowers the melting point of the mixture and brings conductivity.]
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Extraction of copper directly from sulphide ore is less favourable than from its oxide through reduction. Explain.
2CuS (s) + C (s) => CS2 (l) + 2Cu (s) CuO (s) + C (s) => CO (g) + Cu (s) G value is more ve in second case as compared with first...
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Write the chemical reactions taking place in different zones in the blast furnace for the extraction of iron from its ore.
[Hint : (i) C + CO2 => 2CO (ii) 3Fe2O3 + CO => 2Fe2O4 + CO2 (iii) Fe3O4 + CO => 2FeO +...
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Translate the following statements into chemical equations and then balance the equations:
(i) P4 + 5O2 -------> 2P2O5 (ii) 2Al + Fe2O3 -----> Al2O3+ 2Fe (iii) CS2 + 3O2 ------> CO2 + 2SO2 (iv) BaCl2 + ZnSO4 --------> ZnCl2 + BaSO4
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Write word-equations and then balanced equations for the reactions taking place when
(a) Sulphuric acid(aq) + Zinc(s) ------> Zinc sulphate(aq) + Hydrogen(g) H2SO4(aq) + Zn(s) -----> ZnSO4(aq) + H2(g) (b) Hydrochloric acid(aq) + Magnesium(s) -----> Magnesiurn chloride(aq) + Hydrogen(g) 2HCl(aq) + Mg(s ) -----> MgCI2(ag) +...
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