The electrochemical extraction of aluminum fr | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) Incorrect. The electrochemical extraction of aluminum (Hall-Heroult process) is performed at temperatures around $900-1000^{\circ} C$,not $>2500^{

Vedclass · Accepted Answer

$B, C, D$

Vedclass · Answer

(A) Incorrect. The electrochemical extraction of aluminum (Hall-Heroult process) is performed at temperatures around $900-1000^{\circ} C$,not $>2500^{\circ} C$.$(B)$ Correct. The sodium aluminate solution is neutralized by passing $CO_2$ gas to precipitate hydrated alumina: $2Na[Al(OH)_4]_{(aq)} + 2CO_{2(g)} \rightarrow Al_2O_3 \cdot 3H_2O_{(s)} \downarrow + 2NaHCO_{3(aq)}$.$(C)$ Correct. Concentration of bauxite (Bayer's process) involves the dissolution of $Al_2O_3$ in hot aqueous $NaOH$: $Al_2O_3(s) + 2NaOH(aq) + 3H_2O(l) \rightarrow 2Na[Al(OH)_4](aq)$.$(D)$ Correct. The electrolysis of $Al_2O_3$ is performed in a mixture with $Na_3AlF_6$ (cryolite) and $CaF_2$ to lower the melting point and increase conductivity,producing $Al$ at the cathode and $CO_2$ at the anode.

List $I$	List $II$
$A$. Reverberatory furnace	$I$. Pig Iron
$B$. Electrolytic cell	$II$. Aluminum
$C$. Blast furnace	$III$. Silicon
$D$. Zone Refining furnace	$IV$. Copper

The electrochemical extraction of aluminum from bauxite ore involves:

Similar Questions

Match List $I$ with List $II$.

List $I$ List $II$

$A$. Reverberatory furnace $I$. Pig Iron

$B$. Electrolytic cell $II$. Aluminum

$C$. Blast furnace $III$. Silicon

$D$. Zone Refining furnace $IV$. Copper

Which of the following pairs is incorrectly matched?

Select the correct option regarding the processes used during metal extraction from their ores.

What is the percentage $(\%)$ of silver in German silver?

Vedclass Test Series

Exam Paper Generator

Online Exam Module