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 MgCl2

(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

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
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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. 

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
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FeCr2O4 (chromite) is converted to Cr by following steps :

ChromiteINaCrO4IICr2O3IIICr

Reagents in I, II and III step might be:

          I-Step              II-Step                   III-Step

(a)Na2Co3/air,          C                             C

(b)NaOH/air,               C,                         Al, 

(c)Na2Co3/air,          C,                          C, 

(d)conc.H2SO4,          NH4Cl,                   C, 

Subtopic:  Metallurgy of individual elements |
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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

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
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Incorrect statement for the Hall-Heroult process is:

1. Cryolite  Na3AlF6  lower the melting point of  Al2O3, and increase its electrical conductivity.
2. Al is obtained at the cathode, and CO2 at the anode.
3. Li2CO3 can be used in place of cryolite(Na3AIF6)
4. MgF2  can be used in place of fluorspar (CaF2)

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
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Correct match is:

(1) Bayer's method                  Na2CO3

(2) Matte                               98%Cu2S+ 2%FeS

(3) van Arkel method              AgI

(4) Thomas slag                     Raw material for cement industry

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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

 

Subtopic:  Refining Process |
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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

Subtopic:  Metallurgy of individual elements |
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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

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
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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

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
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