Question

Which of the following is an ore of aluminium?

• A. Bauxite
• B. Borax
• C. Colemnite
• D. Kernite

Answer 1

The correct option is A Bauxite

Aluminium : 83000 ppm
(Most abundant metal, 3rd most abundant element)

$\text{Bauxite :}A{l}_2{O}_3.H_{2}O-A{l}_2{O}_3.3H_{2}O$
Aluminosilicate rocks (feldspars, mica)
$\text{Cryolite :}N{a}_{3}Al{F}_6$

Ores of boron:
$\text{Borax}:N{a}_2\left[B_4{O}_5\right(OH{)}_4].8H_{2}O\text{Colemnite}:C{a}_2{B}_6{O}_{11}.5H_{2}O\text{Kernite}:N{a}_2[B_4{O}_5\left(OH{)}_4\right].2H_{2}O\text{Boric acid}:H_{3}B{O}_3$