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1.

In extractive metallurgy of lead, the reduction of the roasted ore to the molten metal by heating with coke is calledA. SmeltingB. roastingC. calcinationD. None of these

Answer» Correct Answer - A
Discussion
2.

The chemical process in the production of steel from haematite ore involvesA. ReducationB. OxidationC. Reducation followed by oxidationD. Oxidation followed by reduction

Answer» Correct Answer - c
Discussion
3.

The white percipaitate (P) is of ,A. `Cu_(2)I_(2)`B. `Cul_(2)`C. `K_(2)[CuI_(4)]D. None

Answer» Correct Answer - C
Discussion
4.

Copper is the most noble of first row transition metals and occurs in small deposits in serveral countries. Ores of copper include chalcanthite `(CuSO_(4).5H_(2)O)`, atacanite `[Cu_(2)Cl(OH)_(3)]`, cuprite `(Cu_(2)O)`, copper glance `(Cu_(2)S)`, and malachite `[Cu_(2)(OH)_(2)CO_(3)]`. However, `80 %` of the world copper production comes from the ore chalcopyrite `(CuFeS_(2))`. The extraction of copper from chalcopyrite involves partial roasting, removal of iron and self-reduction. Partial roasting of chalcopyrite produces

Answer» Correct Answer - A
Discussion