EASY

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Aluminium and copper are extracted from their oxide and sulphide ores respectively. Which of the following is correct?
I. Copper is extracted by the auto reduction of copper oxide by copper sulphide
II. Aluminium cannot be obtained by chemical reduction due to its strong affinity for oxygen
III. In electrometallurgy of $Al$ , graphite is used as cathode to avoid reoxidation of $Al$ into ${Al}_{2} O_{3}$ by preventing formation of $O_{2}$
IV. Sulphide ores of copper are difficult to be reduced than the oxide ores

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Important Questions on General Principles and Processes of Isolation of Elements (Metallurgy)

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Oxidation-Reduction in Metallurgy

Which of the following statements is correct during the extraction of copper?

MEDIUM

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Oxidation-Reduction in Metallurgy

Identify the auto reduction reactions from the following:

$a)$ ${Fe}_{3} O_{4} + 4 CO ⟶ 3 Fe + 4 {CO}_{2}$

$b)$ ${Cu}_{2} O + \frac{1}{2} {Cu}_{2} S ⟶ 3 Cu + \frac{1}{2} {SO}_{2}$

$c)$ $PbS + 2 PbO ⟶ 3 Pb + {SO}_{2}$

$d)$ ${Cu}_{2} O + C ⟶ 2 Cu + CO$

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Oxidation-Reduction in Metallurgy

Which of the following reduction reaction CANNOT be carried out with coke?

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Oxidation-Reduction in Metallurgy

The ore that contains both iron and copper is:

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Oxidation-Reduction in Metallurgy

Extraction of copper by smelting uses silica as an additive to remove.

MEDIUM

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Oxidation-Reduction in Metallurgy

What is flux? Give one example of each of an acidic flux and a basic flux.

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Oxidation-Reduction in Metallurgy

During the extraction of copper, the impurity

(FeS)

is removed as slag by mixing the contaminated copper ore with silica and coke. The molecular formula of slag is

MEDIUM

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Oxidation-Reduction in Metallurgy

The major products of the following reaction are

ZnS (s) + O_{2} (g) \overset{heat}{\to}

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Oxidation-Reduction in Metallurgy

Among the reactions

(a) - (d),

the reaction(s) that does/do not occur in the blast furnace during the extraction of iron is/are:

(a)

C a O + S i O_{2} \to C a S i O_{3}

(b)

3 F e_{2} O_{3} + C O \to 2 F e_{3} O_{4} + C O_{2}

(c)

F e O + S i O_{2} \to F e S i O_{3}

(d)

F e O \to F e + \frac{1}{2} O_{2}

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Oxidation-Reduction in Metallurgy

Which of the following metals cannot be obtained by auto-reduction of their compounds?

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Oxidation-Reduction in Metallurgy

The pair that does not require calcination is

HARD

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Oxidation-Reduction in Metallurgy

Which series of reactions correctly represents the chemical relations related to iron and its compound?

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Oxidation-Reduction in Metallurgy

Calamine is an ore of:

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Oxidation-Reduction in Metallurgy

The addition of silica during the extraction of copper from its sulphide ore :-

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Oxidation-Reduction in Metallurgy

In the isolation of metals, calcination process usually results in:

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Oxidation-Reduction in Metallurgy

Calamine, malachite, magnetite and cryolite, respectively are:

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Oxidation-Reduction in Metallurgy

Sulphide ores are common for the metals:

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Oxidation-Reduction in Metallurgy

Which among following processes occurs at

1500 K

in blast furnace for extraction of iron

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Oxidation-Reduction in Metallurgy

In the extraction of copper from its sulphide ore, metal is finally obtained by the oxidation of cuprous sulphide with:

EASY

Chemistry>Inorganic Chemistry>General Principles and Processes of Isolation of Elements (Metallurgy)>Oxidation-Reduction in Metallurgy

The most common method, used for extraction of metals from oxide ores involves

Important Questions on General Principles and Processes of Isolation of Elements (Metallurgy)

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