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p-Block Elements - I
easy
In Hall’s process, the main reagent is mixed with
A
$NaF$
B
$N{a_3}Al{F_6}$
C
$Al{F_3}$
D
None of these
Solution
(b) Pure alumina is a bad conductor of electricity and the fusion temperature of pure alumina is about $2000\,^°C$ and at this temperature when the electrolysis is carried of fused mass the metal formed vapoureses as the boiling point of $Al$ is $1800\,^°C$.
To overcome this difficulty, $N{a_3}Al{F_6}$ and $Ca{F_2}$ are mixed with alumina.
Standard 11
Chemistry
