Among statements (I) – (IV), the correct ones are-

(I) Limestone is decomposed to CaO during the extraction of iron from its oxides
(II) In the extraction of silver, silver is extracted as an anionic complex
(III) Nickel is purified by Mond's process
(IV) Zr and Ti are purified by the Van Arkel method


1. (III) and (IV) only
2. (I), (III), and (IV) only
3. (II), (III), and (IV) only
4. (I), (II), (III), and (IV)

Subtopic:  Metallurgy of individual elements | Refining Process |
 64%
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Given below are two statements: 

Assertion (A): Magnesium metal is not used for the reduction of alumina in the metallurgy of aluminum
Reason (R): Magnesium can reduce alumina. But the process will be uneconomical.

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.
 



 

Subtopic:  Ellingham Diagram |
 64%
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Consider the following graph.

 
At 1400 oC, the \(\Delta G_{r}^{o}\) the value for the reaction 
2FeO + 2C → 2Fe + CO is

1. -116 kJ mol-1
2. -106 kJ mol-1
3. 100 kJ mol-1
4. -100 kJ mol-1

Subtopic:  Ellingham Diagram |
 62%
From NCERT
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Consider the Ellingham diagram given below.

  

The Y-axis, and X-axis in the graph are respectively:

1. Gibbs energy(\(\Delta G_{r}^{o} \)), and Pressure
2. Gibbs energy (\(\Delta G_{r}^{o} \)), and temperature
3. Enthalpy(\(\Delta H_{r}^{o} \)), and temperature
4. Temperature, and Gibbs energy (\(\Delta H_{r}^{o} \)

Subtopic:  Ellingham Diagram |
 87%
From NCERT
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Select the correct option based on statements below:
Assertion (A): Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation by a more electropositive metal.
Reason (R): Copper is extracted by hydrometallurgy.
  
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
From NCERT
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Select the correct option based on statements below:
Assertion (A): The zone refining method is very useful for producing semiconductors.
Reason (R): Semiconductors are of high purity.
  
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.
Subtopic:  Refining Process |
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Given below are two statements: 

Assertion (A):  Sulphide ores are concentrated by the froth flotation method.
Reason (R): Cresols stabilise the froth in the froth flotation method.

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 72%
From NCERT
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Select the correct option based on the statements below:
Assertion (A): Zirconium can be purified by the van Arkel method.
Reason (R): ZrI4 is volatile and decomposes at 1800 K.
  
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.
Subtopic:  Refining Process |
 81%
From NCERT
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Select the correct option based on statements below:
Assertion (A): Nickel can be purified by Mond’s process.
Reason (R): It is a volatile compound that decomposes at 460 K to give pure Ni.
  
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.
Subtopic:  Refining Process |
 80%
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Match the items of Column I with items of Column II and assign the correct code.

Column I Column II
A Blistered Cu 1.   Aluminium
B Blast furnace 2. 2Cu2O + Cu2S →  6Cu  + SO2
C Reverberatory furnace 3. Iron
D Hall-Heroult process 4. FeO   +   SiO2   →   FeSiO3
5. 2 Cu2S   +   3O2   →   2Cu2O + 2SO2
 

 Codes: 

Options:  A   B   C   D  
1.  2 3 4 1
2. 1 2 3 5
3. 5 4 3 2
4. 4 5 3 2

     

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 82%
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