Which one is a malachite from the following?

1. CuCO3.Cu(OH)2

2. CuFeS2

3. Cu(OH)2

4. Fe3O4

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 80%
From NCERT
NEET - 2019
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Sulphide ores of metals are usually concentrated by the froth flotation process. Which one of the following sulphide ores offers an exception and is concentrated by chemical leaching?

1. Argentite

2. Galena

3. Copper pyrite

4. Sphalerite

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 58%
From NCERT
AIPMT - 2007
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Which of the following elements is present as an impurity to the maximum extent in the pig Iron?
1. Carbon
2. Silicon
3. Phosphorus
4. Manganese

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination | Metallurgy of individual elements |
 81%
From NCERT
AIPMT - 2011
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An interstitial compound among the following is:

1. Invar

2. Steel

3. Bell metal

4. Bronze

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
AIPMT - 2012
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Which one of the following is a mineral of iron?

1. Malachite

2. Cassiterite

3. Pyrolusite

4. Magnetite

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 85%
From NCERT
AIPMT - 2012
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Roasting of sulphides gives the gas X as a by-product. This is a colourless gas with a choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic and  acts as an oxidizing agent and its acid has never been isolated. The gas X is:

1. SO2

2. CO2

3. SO3

4. H2S

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 84%
From NCERT
AIPMT - 2013
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"Metals are usually not found as nitrates in their ores". Out of the following two (I and II) reasons which is/are true for the above observation? 

I: Metal nitrates are highly unstable.
II: Metal nitrates are highly soluble in water.
1. I and II are true
2. I and II are false
3. I is false but II is true
4. I is true but II is false

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
NEET - 2015
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Considering Ellingham diagram, which of the following metals can be used to reduce alumina?

1. Fe

2. Zn

3. Mg

4. Cu

Subtopic:  Ellingham Diagram |
 73%
From NCERT
NEET - 2018
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The correct statement among the following is:  

1. The rate of reaction cannot be understood from the Ellingham diagram.
2. During the formation of metal oxide \(\Delta S\) becomes negative and \(\Delta G\) becomes positive resulting in a positive slope.
3. There is an abrupt change in the slope of the Ellingham line when a change in phase (s→l) or (l→g) takes place.
4. All of the above.

Subtopic:  Ellingham Diagram |
 78%
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\((i) Zr + 2I_2 \xrightarrow{870K} ZrI_4 \xrightarrow{2075K} Zr + 2I_2 \)
\((ii) Ni + 4CO \xrightarrow{330K} Ni(CO)_4 \xrightarrow{450K} \underset{(pure)}{Ni} + 4CO \)

The processes (ii) and (i) above, respectively, are  : 

1. Mond's process; Van Arkel process

2. Van Arkel process; Mond's process

3. Goldschmidt process; Mond's process

4. Mond's process; Goldschmidt process

Subtopic:  Refining Process |
From NCERT
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