In the extraction of Ca by electro reduction of molten CaCl2 some CaF2 is added to the electrolyte for the following reason:
A
To keep the electrolyte in liquid state at temperature lower than the melting point of CaCl2
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B
To effect precipitation of Ca
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C
To effect the electrolysis at lower voltage
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D
To increase the current efficiency
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Solution
The correct option is A To keep the electrolyte in liquid state at temperature lower than the melting point of CaCl2 To keep the electrolyte in liquid state at temperature lower than the m.p. of CaCl2.