Iron is made inactive or passive by:

1. H3PO4

2. conc. HNO3

3. conc. H2SO4

4. dil. HNO3

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 56%
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The inner lining of a blast furnace is  made up of:

1. graphite bricks

2. silica  bricks

3. fire clay bricks

4. basic bricks

Subtopic:  Metallurgy of individual elements |
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Froth floatation process for the concentration of ores is a practical application of:

1. adsorption

2. absorption

3. coagulation

4. sedimentation

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 62%
From NCERT
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Roasting is generally carried out in case of :

1. Oxide ores

2. Sulphide ores

3. Silicate ores

4. Carbonate ores

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 84%
From NCERT
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Which substance is used as basic refractory material in furnace?

1. Al2O3

2. SiO2

3. CaO

4. Fe2O3

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination | Refining Process |
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Rutile is an ore of:

1. Ti

2. Zr

3. Mn

4. V

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 51%
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Which is not a mineral?

1. Mica

2. Peat

3. Quartz

4. Felspar

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 55%
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Which element is purified by Zone refining?

1. Ge

2. Ge and Si

3. Si

4. None

Subtopic:  Refining Process |
 90%
From NCERT
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Alloy is an example of:

1. gel

2. aerosol

3. solid sol

4. emulsion

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 83%
From NCERT
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The second most common element on the earth is:

1. silicon

2. hydrogen

3. nitrogen

4. oxygen

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