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NTA Abhyas NEET2020ChemistryGeneral Principles and Processes of Isolation of MetalsPractice

Which one of the following processes is used for the manufacturing of calcium?

Options

  1. AReduction with CaO with hydrogen
  2. BElectrolysis of molten C a (OH) 2
  3. CElectrolysis of a mixture of anhydrous C a C l 2 and C a F 2
  4. DReduction of CaO with carbon

Correct answer

C. Electrolysis of a mixture of anhydrous C a C l 2 and C a F 2

Step-by-step solution

Calcium is obtained by electrolysis of a fused mass consisting six parts C a C l 2 and one part C a F 2 at about 700 o C in an electrolytic cell made of graphite which acts as anode and a water cooled cathode of iron. C a C l 2 ⇌ C a 2 + + 2 C l - At anode: 2 C l - → C l 2 + 2 e - At cathode: C a 2 + + 2 e - → C a

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