Question

Serpeck's method involves the heating of bauxite with

• A. $NaOH$
• B. $N{a}_{2}C{O}_3$
• C. $N_2+C$
• D. $CaC{O}_3$.

Answer 1

Answer: (C)

In Serpeck's method white bauxite is heated with coke in presence of $N_2$ gas.
$A{l}_2{O}_3+N_2+3C\stackrel{\mathrm{\Delta }}{\to }3CO+2AlN$
$AlN+3H_{2}O⟶N{H}_3+2Al(OH{)}_3$
Aluminium nitride formed in $1^{\text{st }}$ step is reacted with water to produce $Al(OH{)}_3$ which gives $A{l}_2{O}_3$ on ignition.
Aluminium nitride formed in $1^{\text{st }}$ step is reacted with water to produce $Al(OH{)}_3$ which gives $A{l}_2{O}_3$ on ignition.