25803 Metallurgy is the process of
It’s obvious.
25804 What is believed to be the second most common element in the universe
25805 Which of the following substances consists of only one element
(c)Diamond made up of carbon only.
25806 Which of the following minerals is not an ore of aluminum
$\left. {\begin{array}{*{20}{c}} {{\text{Bauxite}}\,\,\,(A{l_2}{O_3})} \\ {{\text{Cryolite}}\,\,(N{a_3}Al{F_6})} \\ {{\text{Corundum}}\,\,(A{l_2}{O_3})} \end{array}} \right\}\( Minerals of \)Al$\({\rm{Gypsum }} \,\,(CaS{O_4}.2{H_2}O)\)
