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1.

In the process of extraction of gold, Roasted gold ore `+CN^(-)+H_2Ooverset(o_2)rarr[X]+OH^(-)` `[X]+Znrarr[Y]+Au` Identify the complexes [X] and [Y]A. `X=[Au(CN)_(2)]^(-), Y=[Zn(CN)_(4)]^(2-)`B. `X=[Au(CN)_(4)]^(3-), Y=[Zn(CN)_(4)]^(2-)`C. `X=[Au(CN)_(2)]^(-), Y=[Zn(CN)_(6)]^(4-)`D. `X=[Au(CN)_(4)]^(-), Y=[Zn(CN)_(4)]^(4-)`

Answer» Correct Answer - A
Discussion
2.

In extractive metallurgy of zinc, partial fusion of `ZnO` with coke is called ____ and reduction of the ore to moleten metal is called ______(smelting, calcining, roasting, sintering).

Answer» Correct Answer - Sintering, Smelting
Discussion
3.

Extraction of metal from the ore cassiterite involvesA. carbon reduction of an oxide oreB. self-reduction of a sulphide oreC. removal of copper impurityD. removal of iron impurity

Answer» Correct Answer - A::D
Discussion
4.

The chemical process in the production of steel from haematite ore involvesA. reductionB. oxidationC. reduction followed by oxidationD. oxidation followed by reduction

Answer» Correct Answer - A
Discussion
5.

Match the anionic species given in Column `I` that are present in the ore (s) given in Column II. `{:("Column I","Column II"),(A."Carbonate",p."Siderite"),(B. "Sulphide",q. "Malachite"),(C. "Hydroxide",r. "Bauxite"),(D. "Oxide", s. "Calamine"),(,t. "Argentite"):}`

Answer» Correct Answer - `Ararrp,q,s;Brarrt;Crarrq;Drarrr`
Discussion
6.

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. Iron is removed from chalcopyrite as.A. FeOB. FeSC. `Fe_(2)O_(3)`D. `FeSiO_(3)`

Answer» Correct Answer - D
Discussion
7.

Which one of the following pairs of substances could be used for the preparation of copper (II) sulphate in the laboratory?A. Copper and dilute sulphuric acidB. Copper (II) carbonate and sodium sulphateC. Copper (II) chloride and dilute sulphuric acidD. Copper (II) oxide and dilute sulphuric acid

Answer» Correct Answer - D
Discussion
8.

Which of the following is soluble in ammonia?A. `Cr(OH)_(2)`B. `Cu(OH)_(2)`C. `Fe(OH)_(3)`D. `Al(OH)_(3)`

Answer» Correct Answer - B
Discussion
9.

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. In self-reduction, the reducing species is.A. `S`B. `O^(2-)`C. `S^(2-)`D. `SO_(2)`

Answer» Correct Answer - C
Discussion