Chalcogens are: 

1. hydrocarbons 

2. ore forming elements 

3. oxide forming elements

4. those having ability to catenate

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
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The following equation represents a method of purification of nickel by,

Ni + 2CO 320KNi(CO)4 420KNi +4CO this method is:

impure                                 pure

1. Cupellation

2. Mond's process

3. Van Arkel method

4. Zone refining

Subtopic:  Refining Process |
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Which pair of elements can form alloy?

1. Zn and Cu

2. Fe and Hg

3. Fe and C

4. C and Pt

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
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Cupellation process is used in the metallurgy of:

1. copper

2. silver

3. lead

4. iron

Subtopic:  Refining Process |
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Chile saltpetre is the ore of:

1. Mg

2. K

3. Na

4. Ca

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
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Blast furnace is used in the metallurgy of:

1. Al

2. Fe

3. gold

4. Ag

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
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Liquation is used to purify:

1. Pb

2. Sn

3. Bi

4. All

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
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Wolframite ore contains:

1. Zn

2. W

3. Hf

4. Au

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
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The process in which ore is  heated in limited supply of air below its melting point  is known as:

1. Roasting

2. Calcination

3. Reduction

4. Distillation

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
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Iron is made inactive or passive by:

1. H3PO4

2. conc. HNO3

3. conc. H2SO4

4. dil. HNO3

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