Correct match is:

(1) Bayer's method                 $—$ $N{a}_{2}C{O}_3$

(2) Matte                               $—$$98\%C{u}_{2}S+<mspace\; width="1em"></mspace>2\%FeS$

(3) van Arkel method              $—$$AgI$

(4) Thomas slag                     $—$Raw material for cement industry

In the purification of impure nickel by Mond's process, metal is purified by:

(1) Electrolytic reduction

(2) Vapour phase thermal decomposition

(3) Thermite reduction

(4) Carbon reduction

The reduction of an oxide by aluminium is called:

(1) Bayer's process

(2) Goldschmidt's aluminothermite process

(3) Hall's process

(4) van Arkel process

Which of the following statements is incorrect?

(1) calamine and siderite are carbonates           

(2) argentite and cuprite are oxides

(3) zinc blende and pyrites are sulphides         

(4) malachite and azurite are ores of copper

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

      Column-I                                                           Column-II

(a) Argentite                                                       (1) Halide ore 

(b) Cuprite                                                          (2) Carbonate ore 

(c) Siderite                                                          (3) Oxide ore 

(d) Carnallite                                                       (4) Sulphide ore 

Codes :

          a       b         c         d                                             a         b        c          d

(A)     4       3         2         1                                   (B)     1         2         3         4   

(C)     2       3         4         1                                   (D)     3         4         1         2

The correct statement among the following is: 

Which does not represent the correct method?

(A) $TiC{l}_2+2Mg\to Ti+2MgC{l}_2<mspace\; width="1em"></mspace>$            : Kroll

(B) $Ni{\left(CO\right)}_4\to Ni+4CO$                      : Mond

(C) $A{g}_{2}C{O}_3\to 2Agc+C{O}_2+\frac{1}{2}{O}_2$         : Van Arkel

(D) $Zr{I}_4\to Zr+2I_2$                                : Van Arkel

Main source of lead is galena (PbS). It is converted to Pb by:

(A) $$\begin{gathered} \mathrm{PbS}<mspace\; width="1em"></mspace>\underset{∆}{\overset{\mathrm{air}}{\to }}\mathrm{PbO}+{\mathrm{SO}}_2 \\ <mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>\stackrel{\mathrm{C}}{\hookrightarrow }<mspace\; width="1em"></mspace>\mathrm{Pb}+{\mathrm{CO}}_2 \end{gathered}$$

(B) $$\begin{gathered} \mathrm{PbS}<mspace\; width="1em"></mspace>\underset{∆}{\overset{\mathrm{air}}{\to }}\mathrm{PbO}+\mathrm{Pbs} \\ <mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>\hookrightarrow <mspace\; width="1em"></mspace>\mathrm{Pb}+{\mathrm{SO}}_2 \end{gathered}$$

(A) A                                                                   (B) B

(C) both                                                              (D) none

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