In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with

(1) copper (I) sulphide (Cu2S)

(2) sulphur dioxide (SO2)

(3) iron sulphide (FeS)

(4) carbon monoxide (CO)

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 75%
From NCERT
NEET - 2012
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Consider the following reactions at 1000°C.

(I) Zns+1/2O2gZnOg;
                                      G°=-360 kJ mol-1
(II) Cs +1/2O2gCog;
                                      G°=-460 kJ mol-1 

and choose the correct statement at 1000°C.

(a) ZnO is more stable than CO

(b) ZnO can be reduced to Zn by C

(c) ZnO and CO are formed at equal rate

(d) ZnO can not be reduced to Zn by C

Subtopic:  Ellingham Diagram | Metallurgy of individual elements |
 76%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Chromium is obtained by reducing concentrated chromite ore with :

(a) red hot coke

(b) gaseous hydrogen 

(c) aluminium powder

(d) carbon monoxide  

Subtopic:  Metallurgy of individual elements |
 57%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

advertisementadvertisement

The substance that acts as a collector in the froth flotation method is:

1. Sodium xenate.           

2. Sodium pyrophosphate.

3. Sodium nitroprusside.

4. Sodium ethyl xanthate. 

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 76%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Links
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

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 |
 87%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

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 |
 62%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

advertisementadvertisement

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

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 88%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The basic principle of froth floatation is-

1.  Impurities and metal ore have different wetting properties. 
2. Impurities and metal ore have different solubility.
3. Impurities and metal ore have different diversity.
4. Impurities and metal ore have different compressing power. 

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 84%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Out of the following which metal can be purified by Van Arkel method?

1.  Au

2.  Zr

3.  Ag

4.  Cu

Subtopic:  Refining Process |
 94%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

advertisementadvertisement

During electrolysis of fused NaCl in order to obtain Na, H2 is liberated at the cathode of Pt while with the cathode of Hg, it forms sodium amalgam. This is because

(I)  Pt is inert

(2)  Hg is a liquid

(3)  More voltage is required to produce H2 at Hg than at Pt

(4)  H ions are formed rapidly when Hg is used as a cathode

Subtopic:  Electrode & Electrode Potential |
 53%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints