Chemistry
Calcium, Copper, Lead, Aluminium, Zinc, Chromium, Magnesium, Iron. Choose the major metals from the list given above to make the following alloys :
(i) Stainless steel
(ii) Brass.
Metallurgy
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Answer
(i) Iron and Chromium are used to make stainless steel
(ii) Copper and Zinc are used to make brass.
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Extraction of Aluminium Step 1 : Dressing of the ore chemical method Baeyer's process - Step 1, Step 2, Step 3 14. Bauxite to - sodium aluminate Al2O3.2H2O + NaOH ⟶ …………… + …………… 15. Sodium aluminate to - aluminium hydroxide NaAlO2 + H2O ⟶ …………… + …………… ↓ 16. Aluminium hydroxide to pure alumina Al(OH)3 ⟶ …………… + …………… Step 2: Conversion of conc. ore to its oxide Step not necessary since the ore is already an oxide Step 3: Reduction of metallic oxide to its metal Hall Heroult's Process - Reduction by electrolysis 17. Electrolytic reduction of pure alumina Al2O3 ⇌ …………… + …………… 18. At cathode 2Al3+ + 6e- ⟶ …………… 19. At anode 3O2- - 6e- ⟶ 3[……………] ⟶ 3O2 Step 4: Electrorefining of aluminium [reference] A to F below relate to the source and extraction of either Zinc or aluminium
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B : Coke,
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D : Froth floatation,
E : Sodium hydroxide solution,
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