MetallurgyHard
Question
Give the correct order of initials T or F for following statements. Use T if statement is true and F if it is false.
(i) In Gold Schmidt thermite process aluminium acts as a reducing agent.
(ii) Mg is extracted by electrolysis of aqueous solution of MgCI2
(iii) Extraction of Pb is possible by carbon reduction of PbO in smelting.
(iv) Red bauxite is purified by Serpeck′s process
(i) In Gold Schmidt thermite process aluminium acts as a reducing agent.
(ii) Mg is extracted by electrolysis of aqueous solution of MgCI2
(iii) Extraction of Pb is possible by carbon reduction of PbO in smelting.
(iv) Red bauxite is purified by Serpeck′s process
Options
A.T T T F
B.T F F T
C.F T T T
D.T F T F
Solution
(i) Cr2+3O3 + 2Alo 
Al2+3O3 + 2Cr0
(ii) Mg is extracted by electrolytic reduction of fused MgCl2. As Mg lies above hydrogen in electrochemical series.
(iii) PbO + C
Pb + CO ; CaO + SiO2 
CaSiO3
(iv) Red bauxite (contains impurity of iron oxide) is purified by Bayer′s / Hall′s process.
Al2+3O3 + 2Cr0(ii) Mg is extracted by electrolytic reduction of fused MgCl2. As Mg lies above hydrogen in electrochemical series.
(iii) PbO + C
Pb + CO ; CaO + SiO2 CaSiO3 (iv) Red bauxite (contains impurity of iron oxide) is purified by Bayer′s / Hall′s process.
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