P-Block Elements Ques 39

Question: In Hall’s process, the main reagent is mixed with

[AFMC 2005]

Options:

A) NaF

B) $ Na_3AlF_6 $

C) $ AlF_3 $

D) None of these

Show Answer

Answer:

Correct Answer: B

Solution:

Pure alumina is a bad conductor of electricity and the fusion temperature of pure alumina is about $ 2000{}^\circ 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{}^\circ C $ . To overcome this difficulty, $ Na_3AlF_6 $ and $ CaF_2 $ are mixed with alumina.



NCERT Chapter Video Solution

Dual Pane