For which of the following metals Bessemerisation process is important?

I : Fe, II : Cu, III : Al, IV : Silver :

(1) I, II                                     

(2) II, III

(3) I, III                                     

(4) all

The chemical processes in the production of steel from haematite ore involve:

(1) Reduction                                       
(2) Oxidation
(3) Reduction followed by oxidation         
(4) Oxidation followed by reduction

The chemical composition of "slag" formed during the smelting process in the extraction of copper is:

1. Cu₂ + FeS                                    

2. FeSiO₃

3. CuFeS                                         

4. Cu₂S + FeO

Which of the following statement is incorrect about the extractive metallurgy of copper?

(1) Matte chiefly consists of cuprous sulfide and some ferrous sulphide.

(2) Most of the impurity of iron sulphide is removed as fusible slag during roasting.

(3) The copper pyrites is concentrated by froth floatation process.

(4) self reduction and electrolysis respectively. 

Pb and Sn are extracted from their chief ore by:

1. carbon reduction and self-reduction respectively.

2. self-reduction and carbon reduction respectively.

3. electrolysis and self-reduction respectively.

4. self-reduction and self-reduction respectively.

Which of the following statements is incorrect?

(1) Cassiterite ore of tin contains the impurities of Wol-framite which are separated by electromagnetic separator.

(2) Tin metal is obtained by the carbon reduction of black tin.

(3) In the extraction of lead from galena, the roasting and self-reduction are carried in the same furnace at different temperatures.

(4) Reducing agent of haematite in blast-furnace is coke in upper part and CO in lower part of furnace.

Which of the following process is used in the extractive metallurgy of magnesium?

1. Fused salt electrolysis

2. Self reduction

3. Aqueous solution electrolysis

4. Thermite process.

White bauxite is purified by:

(1) Baeyer's process                               

(2) Hoop's process

(3) Serpeck's process                             

(4) Hall's process 

Which of the following statements is correct?

(1) In Hall-heroult process, the electrolyte used is a molten mixture of alumina, sodium hydroxide and cryolite.

(2) Lead is extracted from its chief ore by both carbon reduction and self reduction.

(3) Tin is extracted from its chief ore by carbon monoxide reduction.

(4) Siderite, cassiterite and argentite are carbonate ores.

Match column (I) with column (II) and select the correct answer using codes given below in the lists.

    Column - I                                                        Column - II

(i) Cynide process                                                (a) Extraction of Al

(ii) Self reduction                                                 (b) Extraction of Ag

(iii) Electrolytic reduction                                      (c) Extraction of Cu

(iv) Carbon reduction                                           (d) Extraction of Sn

(1) (i)-(b), (ii)-(c), (iii)-(a), (iv)-(d)                     

(2) (i)-(b), (ii)-(d), (iii)-(a), (iv)-(c)

(3) (i)-(d), (ii)-(a), (iii)-(c), (iv)-(b)                     

(4) (i)-(c), (ii)-(b), (iii)-(d), (iv)-(a)