During the electrolysis of cryolite, aluminium and fluorine are formed in ___ molar ratio is

$AI{F}_3\to A{l}^{+3}+3F^{-}$

$A{I}^{+3}+3e\to AI$

1 mole of Al required 3F
1 F to give 1/3 mole Al ratio of
1 mole of $f_2$ required 2F
1F to give 1/2 mole F₂
 $2F^{-}\to F_2+2e$
1 moe of $f\to 2f\to 1f\to 1/3mole$  
Ratio of  $A1\&f=\frac{1}{3}:\frac{1}{2}\Rightarrow 2:3$