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Which of the following code regarding the metallurgy of magnesium using electrolytic method is correct
$(I)$ electrolyte is magnesium chloride containing $N a C l$ and $N a F$
$(I I)$ air tight iron pot acts as a cathode
$(I I I)$ electrolysis is done in the atmosphere of coal gas
$(I V)$ molten magnesium is heavier than the electrolyte

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$I & I V$

All

$I, I I & I V$

$I, I I & I I I$

answer is B.

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Detailed Solution

$\to$ Electrolyte used in the extraction of $M g :$

Fused Electrolyte $(50 % N a C l + 35 % M g C l_{2} + 15 % C a C l_{2})$

$\to$ Electrolysis is carried out in presence of coal gas or inert gas, if atmospheric air is present them liberated $M g$ will react with it

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