Bauxite ore is made up of Al2O3 + SiO2 + TiO2 + Fe2O3. This ore is treated with conc. NaOH solution at 500 K and 35 bar pressure for few hours and filtered when hot. In the filtrate, the species present are
In bauxite ore, only Al2O3 reacts with conc. NaOH and forms sodium meta aluminate. This, further dissolves in water.
Wolframite ore is separate from tin stone ore by the process of
Pb and Sn are extracted from their chief ore by
‘Lapis-Lazuli’ is a blue coloured precious stone. It is mineral of the class
Gallium arsenide is purified by
Which of the following is correct?
Metals found in free as well as combined states are
By which of the following processes, the ore is made porous?
Stainless steel has iron and
Thermite process is used in reduction of
When copper pyrites is roasted in excess of air, a mixture of CuO + FeO is formed. FeO is present as impurities. This can be removed as slag during reduction of CuO. The flux added to form slag is