Match the items in Column I with the items in Column II and assign the correct code.

Column I Column II
A. Pendulum 1. Chrome steel
B. Malachite 2. Nickel Steel
C. Calamine 3. Na3AlF6
D. Cryolite 4. CuCO3. Cu (OH)2

5. ZnCO3


Codes

A B C D
1. 1 2 3 4
2. 2 4 5 3
3. 2 3 4 5
4. 4 5 3 2
Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 89%
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Among the following an iron mineral is:

1. Malachite

2. Cassiterite

3. Pyrolusite

4. Magnetite

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 86%
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 the choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic, acts as an oxidising 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 |
 85%
From NCERT
AIPMT - 2013
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From the following, the ores that are concentrated by froth flotation are:

a. Haematite b. Galena
c. Copper pyrites    d. Magnetite

Choose the correct option:
1. a and b
2. b and c
3. c and d
4. a and d

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 81%
From NCERT
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The fundamental principle of froth flotation process is:

1. Impurities and metal ore have different wetting properties.
2. Impurities and metal ore have different solubility.
3. Impurities and metal ore have different diversity.
4. Impurities and metal ore have different compressive powers.

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 84%
From NCERT
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Which are the most abundant elements present inside the earth's crust?

1. Al, and Fe 

2. Al, and Cu

3. Fe, and Cu

4. Cu, and Ag

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 81%
From NCERT
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The chemical composition of "slag" formed during the smelting process in the extraction of copper is:

1. Cu+ FeS                                    

2. FeSiO3

3. CuFeS                                         

4. Cu2S + FeO

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 80%
From NCERT
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Consider the following reaction.
\(\small{Bauxite\ ore\ +\ NaOH\ (conc.) \xrightarrow[\Delta]{Digester} \underset{Soluble}{(A)}}\)
\((A) \xrightarrow{Fresh\ Al(OH)_3}\ \underset{White}{(B)}\ +\ (C)\)
\({(B)} \xrightarrow[]{\Delta}\ (D)\ +\ H_2O\)
What is the molecular formula of compound D?

1. NaAlO2

2. AlOH3

3. Al2O3

4. Na2O

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 80%
From NCERT
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Reactions among the following that occur during calcination are:

a. CaCO→ CaO + CO2
b. 2FeS2 + \(\frac{11}{2}\)O2 → Fe2O3 + SO2
c. Al2O3.xH2O → Al2O+ xH2O
d. ZnS + \(\frac{3}{2}\)O2 → ZnO + SO2

Choose the correct option:
1. a and b
2. b and c
3. c and d
4. a and c

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 78%
From NCERT
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The substance that acts as a collector in the froth flotation method is:

1. Sodium xenate.           

2. Sodium pyrophosphate.

3. Sodium nitroprusside.

4. Sodium ethyl xanthate. 

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 76%
From NCERT
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