WBJEE 2020 Chemistry Solved Paper

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Question : 28 of 40

Marks: +1, -0

In the extraction of Ca by electro reduction of molten CaCl2 some CaF2 is added to the electrolyte for the following reason :

To keep the electrolyte in liquid state at temperature lower than the m. p. of CaCl2
To effect precipitation of Ca
To effect the electrolysis at lower voltage
To increase the current efficiency

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