Which element occurs freely in nature?

1. Iodine

2. Sulphur

3. Phosphorus

4. Magnesium

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
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Silver obtained by argentiferrous lead is purified by:

1. distillation

2. froth floatation

3. cupellation

4. reacting with KCN

Subtopic:  Refining Process |
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Which process is not used in purification of bauxite?

1. Hall's method

2. Baeyer's method

3. Serpek's method

4. Frankland's method

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination | Metallurgy of individual elements |
 67%
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Chloride ore among the following is:

1. malachite

2. magnesite

3. magnetite

4. Karnalite

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 71%
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Chalcogens are: 

1. hydrocarbons 

2. ore forming elements 

3. oxide forming elements

4. those having ability to catenate

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 51%
From NCERT
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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 |
 86%
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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 |
 67%
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Chile saltpetre is the ore of:

1. Mg

2. K

3. Na

4. Ca

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 60%
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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 |
 81%
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