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CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321045 Plumbo-solvency refers to :

1 Oxidation of lead to lead oxide

2 Oxidation of lead to red lead

3 Dissolution of lead in water containing air

4 Making lead wires by forcing heated metal through a dye

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321046 Lead is extracted from galena ( $PbS$ ), either by following ways.
(I) $PbS \to_{- {SO}_{2}}^{Roasted in air} PbO \to_{- {CO}_{2}}^{Heated with C} Pb$
(II) $PbS \to_{- {SO}_{2}}^{Roasted in air} PbO \overset{Heated with PbS}{\to} Pb + {SO}_{2}$
Auto-reduction process is

1 I

2 II

3 Both (I) and (II)

4 None of these

Explanation:

In auto-reduction, no external reducing agent is required. In such reduction reaction, the product formed acts as a reducing agent and reduces the oxide to metal. Thus, only reaction II is called auto-reduction.
$2 PbS + 3 O_{2} \overset{Roasted in air}{\to} 2 PbO + 2 {SO}_{2}$
$2 PbO + PbS ⟶ 3 Pb + {SO}_{2}$
(Act as a reducing agent)

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321047 Roasted tin stone ore after washing with water is known as

1 block tin

2 white tin

3 black tin

4 granulated tin

Explanation:

Tin stone $({SnO}_{2})$ after roasting and washing is called black tin.

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321048 The percentage of impurities present in zinc spelter is

1 10

2 0.2

3 2

4 0.02

Explanation:

$98 %$ pure zinc is called zinc spelter.

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321049 Which of the following species is a desirable substance in the extraction of copper but not in the extraction of iron?

1

{CaSiO}_{3}

2

{FeSiO}_{3}

3

{SiO}_{2}

4 Coke

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321045 Plumbo-solvency refers to :

1 Oxidation of lead to lead oxide

2 Oxidation of lead to red lead

3 Dissolution of lead in water containing air

4 Making lead wires by forcing heated metal through a dye

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321046 Lead is extracted from galena ( $PbS$ ), either by following ways.
(I) $PbS \to_{- {SO}_{2}}^{Roasted in air} PbO \to_{- {CO}_{2}}^{Heated with C} Pb$
(II) $PbS \to_{- {SO}_{2}}^{Roasted in air} PbO \overset{Heated with PbS}{\to} Pb + {SO}_{2}$
Auto-reduction process is

1 I

2 II

3 Both (I) and (II)

4 None of these

Explanation:

In auto-reduction, no external reducing agent is required. In such reduction reaction, the product formed acts as a reducing agent and reduces the oxide to metal. Thus, only reaction II is called auto-reduction.
$2 PbS + 3 O_{2} \overset{Roasted in air}{\to} 2 PbO + 2 {SO}_{2}$
$2 PbO + PbS ⟶ 3 Pb + {SO}_{2}$
(Act as a reducing agent)

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321047 Roasted tin stone ore after washing with water is known as

1 block tin

2 white tin

3 black tin

4 granulated tin

Explanation:

Tin stone $({SnO}_{2})$ after roasting and washing is called black tin.

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321048 The percentage of impurities present in zinc spelter is

1 10

2 0.2

3 2

4 0.02

Explanation:

$98 %$ pure zinc is called zinc spelter.

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321049 Which of the following species is a desirable substance in the extraction of copper but not in the extraction of iron?

1

{CaSiO}_{3}

2

{FeSiO}_{3}

3

{SiO}_{2}

4 Coke

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321045 Plumbo-solvency refers to :

1 Oxidation of lead to lead oxide

2 Oxidation of lead to red lead

3 Dissolution of lead in water containing air

4 Making lead wires by forcing heated metal through a dye

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321046 Lead is extracted from galena ( $PbS$ ), either by following ways.
(I) $PbS \to_{- {SO}_{2}}^{Roasted in air} PbO \to_{- {CO}_{2}}^{Heated with C} Pb$
(II) $PbS \to_{- {SO}_{2}}^{Roasted in air} PbO \overset{Heated with PbS}{\to} Pb + {SO}_{2}$
Auto-reduction process is

1 I

2 II

3 Both (I) and (II)

4 None of these

Explanation:

In auto-reduction, no external reducing agent is required. In such reduction reaction, the product formed acts as a reducing agent and reduces the oxide to metal. Thus, only reaction II is called auto-reduction.
$2 PbS + 3 O_{2} \overset{Roasted in air}{\to} 2 PbO + 2 {SO}_{2}$
$2 PbO + PbS ⟶ 3 Pb + {SO}_{2}$
(Act as a reducing agent)

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321047 Roasted tin stone ore after washing with water is known as

1 block tin

2 white tin

3 black tin

4 granulated tin

Explanation:

Tin stone $({SnO}_{2})$ after roasting and washing is called black tin.

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321048 The percentage of impurities present in zinc spelter is

1 10

2 0.2

3 2

4 0.02

Explanation:

$98 %$ pure zinc is called zinc spelter.

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321049 Which of the following species is a desirable substance in the extraction of copper but not in the extraction of iron?

1

{CaSiO}_{3}

2

{FeSiO}_{3}

3

{SiO}_{2}

4 Coke

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321045 Plumbo-solvency refers to :

1 Oxidation of lead to lead oxide

2 Oxidation of lead to red lead

3 Dissolution of lead in water containing air

4 Making lead wires by forcing heated metal through a dye

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321046 Lead is extracted from galena ( $PbS$ ), either by following ways.
(I) $PbS \to_{- {SO}_{2}}^{Roasted in air} PbO \to_{- {CO}_{2}}^{Heated with C} Pb$
(II) $PbS \to_{- {SO}_{2}}^{Roasted in air} PbO \overset{Heated with PbS}{\to} Pb + {SO}_{2}$
Auto-reduction process is

1 I

2 II

3 Both (I) and (II)

4 None of these

Explanation:

In auto-reduction, no external reducing agent is required. In such reduction reaction, the product formed acts as a reducing agent and reduces the oxide to metal. Thus, only reaction II is called auto-reduction.
$2 PbS + 3 O_{2} \overset{Roasted in air}{\to} 2 PbO + 2 {SO}_{2}$
$2 PbO + PbS ⟶ 3 Pb + {SO}_{2}$
(Act as a reducing agent)

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321047 Roasted tin stone ore after washing with water is known as

1 block tin

2 white tin

3 black tin

4 granulated tin

Explanation:

Tin stone $({SnO}_{2})$ after roasting and washing is called black tin.

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321048 The percentage of impurities present in zinc spelter is

1 10

2 0.2

3 2

4 0.02

Explanation:

$98 %$ pure zinc is called zinc spelter.

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321049 Which of the following species is a desirable substance in the extraction of copper but not in the extraction of iron?

1

{CaSiO}_{3}

2

{FeSiO}_{3}

3

{SiO}_{2}

4 Coke

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321045 Plumbo-solvency refers to :

1 Oxidation of lead to lead oxide

2 Oxidation of lead to red lead

3 Dissolution of lead in water containing air

4 Making lead wires by forcing heated metal through a dye

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321046 Lead is extracted from galena ( $PbS$ ), either by following ways.
(I) $PbS \to_{- {SO}_{2}}^{Roasted in air} PbO \to_{- {CO}_{2}}^{Heated with C} Pb$
(II) $PbS \to_{- {SO}_{2}}^{Roasted in air} PbO \overset{Heated with PbS}{\to} Pb + {SO}_{2}$
Auto-reduction process is

1 I

2 II

3 Both (I) and (II)

4 None of these

Explanation:

In auto-reduction, no external reducing agent is required. In such reduction reaction, the product formed acts as a reducing agent and reduces the oxide to metal. Thus, only reaction II is called auto-reduction.
$2 PbS + 3 O_{2} \overset{Roasted in air}{\to} 2 PbO + 2 {SO}_{2}$
$2 PbO + PbS ⟶ 3 Pb + {SO}_{2}$
(Act as a reducing agent)

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321047 Roasted tin stone ore after washing with water is known as

1 block tin

2 white tin

3 black tin

4 granulated tin

Explanation:

Tin stone $({SnO}_{2})$ after roasting and washing is called black tin.

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321048 The percentage of impurities present in zinc spelter is

1 10

2 0.2

3 2

4 0.02

Explanation:

$98 %$ pure zinc is called zinc spelter.

CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

321049 Which of the following species is a desirable substance in the extraction of copper but not in the extraction of iron?

1

{CaSiO}_{3}

2

{FeSiO}_{3}

3

{SiO}_{2}

4 Coke

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