Galena contains ZnS with PbS. Which of the following is used as depressant to stop ZnS to come with foam?

1. NaCN

2. Aniline

3. Pine Oil

4. H2O

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 84%
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Which of the following is leached with NaCN?

1. Ore of Al

2. Ore of Cu

3. Ore of Ag

4. Ore of Zn

 

Subtopic:  Refining Process |
 64%
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Vapour phase refining can be carried out in case of 

1. Ni

2. Zr

3. Ti

4. All of these

Subtopic:  Refining Process |
 88%
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Out of the following which metal can be purified by the Van Arkel method?

1. Ti

2. Zr

3. Hf

4. All of these

Subtopic:  Refining Process |
 88%
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Which of the following has a negative slope?

       

1. C → CO

2. Fe → Fe2O3

3. Mg → MgO

4. All of the above

Subtopic:  Ellingham Diagram |
 68%
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Aluminium is used as a reducing agent in the reduction of :-

1. Cr2O3

2. SnO2

3. ZnO

4. HgO

Subtopic:  Ellingham Diagram |
 62%
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Percentage of silver in the alloy, German Silver is:-

1. 2.5%

2. 1.5%

3. 10%

4. 0%

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 55%
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Mond's process is used for

1. Ni

2. Al

3. Fe

4. Cu

Subtopic:  Refining Process |
 93%
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In the metallurgy of copper, the slag is -

1. FeSiO3

2. CaCO3

3. CaSiO3

4. CaO

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 70%
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Serpek's method involves the heating of bauxite with 

1. NaOH

2. Na2CO3

3. N2 + C

4. CaCO3

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 56%
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