Embibe Experts Solutions for Exercise 1: ICSE-2018

Give the chemical formula of bauxite.

$\mathrm{A}: {\mathrm{Na}}_2{\mathrm{AlF}}_5 \mathrm{B}: {\mathrm{Al}}_2{\mathrm{O}}_3.2{\mathrm{H}}_2\mathrm{O} \mathrm{C}: {\mathrm{Na}}_3{\mathrm{AlF}}_6 \mathrm{D}: {\mathrm{AlH}}_3{\mathrm{O}}_3$ (Enter your correct answer as $\mathrm{A}, \mathrm{B}, \mathrm{C}$ or $\mathrm{D}$)

Name the main component of the following alloy: Brass

Name the main component of the following alloy: Duralumin

Write the equation for the formation of aluminium at the cathode during the electrolysis of alumina.

Answer the following question based on the extraction of aluminium from alumina by Hall-Heroult’s Process.

What is the function of cryolite used along with alumina as the electrolyte? 

Answer the following question based on the extraction of aluminium from alumina by Hall-Heroult’s Process.

Why is powdered coke sprinkled on top of the electrolyte?

Answer the following question based on the extraction of aluminium from alumina by Hall-Heroult’s Process.

Name the electrode, from which aluminium is collected.

Name the gas evolved in the following case:

Alumina undergoes electrolytic reduction.