Give the correct order of initials T or F for following statements. Use T if statement is true and F if it is false.

(i) In Gold schmidt thermite process aluminium acts as a reducing agent.

(ii) Mg is extracted by electrolysis of aq. solution of $MgC{l}_2$

(iii) Extraction of Pb is possible by carbon reduction method

(iv) Red Bauxite is purified by Serpeck's process

(1) TTTF                               

(2) TFFT

(3)FTTT                               

(4) TFTF

A substance that can act as collector in the froth floatation method is -

1. Sodium xenate.             

2. Sodium pyrophosphate.

3. Sodium nitroprusside.   

4. Sodium ethyl xanthate. 

$FeC{r}_2{O}_4$ (chromite) is converted to Cr by following steps :

$Chromite\stackrel{I}{\to }NaCr{O}_4\stackrel{II}{\to }C{r}_2{O}_3\stackrel{III}{\to }Cr$

Reagents in I, II and III step might be:

          I-Step              II-Step                   III-Step

(a)$N{a}_{2}C{o}_3/air,∆$          C                             C

(b)NaOH/air,$∆$               C, $∆$                        Al, $∆$

(c)$N{a}_{2}C{o}_3/air,∆$          C, $∆$                         C, $∆$

(d)conc.$H_{2}S{O}_4,<mspace\; width="1em"></mspace>∆$         $N{H}_{4}Cl,<mspace\; width="1em"></mspace>∆$                  $C,<mspace\; width="1em"></mspace>∆$

What is the composition of the anode mud used in the electrolytic refining of silver?

1. Zn, Cu, Ag, Au

2. Zn, Ag, Au

3. Cu, Ag, Au

4. Au only

Incorrect statement for the Hall-Heroult process is:

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