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 |
 59%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

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 |
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

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 |
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

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

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 65%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

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 |
 81%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

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 |
 66%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

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 |
 60%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

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 |
 75%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

The correct statement among the following is: 

1. In the decomposition of oxide into oxygen and gaseous metal, entropy increases.
2. Decomposition of oxide is an endothermic change.
3. To make ∆G° negative, the temperature should be high enough so that T∆S° > ∆H°.
4. All of the above.

Subtopic:  Ellingham Diagram |
 86%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

Which does not represent the correct method?

(A) TiCl2+2MgTi+2MgCl2             : Kroll

(B) NiCO4Ni+4CO                      : Mond

(C) Ag2CO32Agc+CO2+12O2         : Van Arkel

(D) ZrI4Zr+2I2                                : Van Arkel

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 81%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh