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Most Important Selected Qs for JEE AdvancedChemistryGeneral Principles and Processes of Isolation of Metals

Consider the following metallurgical processes. (i) Heating impure metal with CO and distilling the resulting volatile carbonyl (b.p. 43^ C ) and finally decomposition at 150^ -200^ C to get the pure metal (ii) Heating the sulphide ore in air until a part is converted to oxide and then further heating in the absence of air to let the oxide react with unchanged metal sulphide (iii) Electrolysis of the molten electroly

Options

  1. A(i), (ii) and (iii)
  2. B(ii), (iii) and (i)
  3. C(iii), (i) and (ii)
  4. D(ii), (i) and (iii)

Correct answer

C. (iii), (i) and (ii)

Step-by-step solution

(i) (impure) Ni +4 CO 50^ C (volatile) [ Ni ( CO ₄ ) ] 230^ C (pure) Ni +4 CO aligned & (ii) Cu ₂ ~S + 3 2 O ₂ Cu ₂ O + SO ₂ & Cu ₂ ~S +2 Cu ₂ O [ high ] high 6 Cu + SO ₂ aligned (iii) MgCl ( s ) electrolysis Mg ²⁺(1)+2 Cl (l) At cathode : Mg ²⁺+2 e ⁻ Mg ( s ) At anode : 2 Cl ⁻( l ) Cl ₂( ~g )+2 e ⁻

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