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Copper is the most noble of the first row transition metals and occurs in small deposits in several countries. Ores of copper include chalcanthite (CuSO4.5H2O), atacamite (Cu2CI(OH)3), cuprite (Cu2O), copper glance (Cu2S) and malachite (Cu2(OH)2CO3). However, 80% of the world copper production comes from the ore chalcopyrite (CuFeS2). The extraction of copper from chalcopyrite involves partial roasting, removal of iron and self-reduction.
Q. 
In self-reduction, the reducing species is
  • a)
    S
  • b)
    O2-
  • c)
    S2-
  • d)
    SO2
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
Copper is the most noble of the first row transition metals and occurs...
Cu2S + 2Cu2O → 6Cu + SO2
lnCu2S, sulphur is S2- and in SO2, sulphur is in +4 state.
Hence, S2- is acting as reducing agent.
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Most Upvoted Answer
Copper is the most noble of the first row transition metals and occurs...
In the extraction of copper from chalcopyrite, self-reduction plays a crucial role. Self-reduction refers to a process where a substance is reduced by its own elements or compounds. In this case, self-reduction involves the reduction of copper(II) sulfide (CuFeS2) to copper metal (Cu) by the sulfur present in the compound.

Process of Self-Reduction in Copper Extraction:

1. Partial Roasting: The first step in the extraction of copper from chalcopyrite is partial roasting. Chalcopyrite is heated in the presence of excess oxygen, which leads to the oxidation of a part of the sulfur present in the compound. The reaction can be represented as follows:
CuFeS2 + 3O2 → CuFeO2 + 2SO2

2. Removal of Iron: The resulting product from partial roasting contains iron oxide (CuFeO2) and copper(II) sulfide (CuFeS2). The iron oxide can be separated from the mixture by magnetic separation or by the addition of silica (SiO2), which reacts with iron oxide to form a slag. The reaction can be represented as follows:
CuFeO2 + SiO2 → CuSiO3 + FeO

3. Self-Reduction: The final step in the extraction of copper involves self-reduction. The copper(II) sulfide (CuFeS2) obtained after the removal of iron is heated in the absence of air or oxygen. The sulfur present in the compound acts as the reducing agent and reacts with the copper(II) sulfide to form copper metal and sulfur dioxide gas. The reaction can be represented as follows:
CuFeS2 → Cu + FeS + SO2

Reducing Species in Self-Reduction:

The reducing species in self-reduction is sulfur (S). As mentioned earlier, the sulfur present in copper(II) sulfide (CuFeS2) acts as a reducing agent. It combines with the copper(II) sulfide to form copper metal (Cu) and sulfur dioxide (SO2) gas.

Therefore, the correct answer is option 'C' - S2.

Summary:
- Self-reduction is a crucial step in the extraction of copper from chalcopyrite.
- It involves the reduction of copper(II) sulfide (CuFeS2) to copper metal (Cu) by the sulfur present in the compound.
- The process includes partial roasting, removal of iron, and self-reduction.
- The reducing species in self-reduction is sulfur (S).
- The reaction can be represented as CuFeS2 → Cu + FeS + SO2.
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Read the passage given below and answer the following questions:The d block elements are the 40 elements contained in the four rows of ten columns (3-12) in the periodic table. As all the d block elements are metallic, the term d-block metals is synonymous. This set of d-block elements is also often identified as the transition metals, but sometimes the group 12 elements (zinc, cadmium, mercury) are excluded from the transition metals as the transition elements are defined as those with partly filled d or f shells in their compounds. Inclusion of the elements zinc, cadmium and mercury is necessary as some properties of the group 12 elements are appropriate logically to include with a discussion of transition metal chemistry. The term transition element or transition metal appeared to derive from early studies of periodicity such as the Mendeleev periodic table of the elements. His horizontal table of the elements was an attempt to group the elements together so that the chemistry of elements might be explained and predicted. In this table there are eight groups labeled I-VIII with each subdivided into A and B subgroups. Mendeleev recognized that certain properties of elements in Group VIII are related to those of some of the elements in Group VII and those at the start of the next row Group I. In that sense, these elements might be described as possessing properties transitional from one row of the table to the next.In the following questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices on the basis of the above passage.Assertion (

Read the passage given below and answer the following questions:The d block elements are the 40 elements contained in the four rows of ten columns (3-12) in the periodic table. As all the d block elements are metallic, the term d-block metals is synonymous. This set of d-block elements is also often identified as the transition metals, but sometimes the group 12 elements (zinc, cadmium, mercury) are excluded from the transition metals as the transition elements are defined as those with partly filled d or f shells in their compounds. Inclusion of the elements zinc, cadmium and mercury is necessary as some properties of the group 12 elements are appropriate logically to include with a discussion of transition metal chemistry. The term transition element or transition metal appeared to derive from early studies of periodicity such as the Mendeleev periodic table of the elements. His horizontal table of the elements was an attempt to group the elements together so that the chemistry of elements might be explained and predicted. In this table there are eight groups labeled I-VIII with each subdivided into A and B subgroups. Mendeleev recognized that certain properties of elements in Group VIII are related to those of some of the elements in Group VII and those at the start of the next row Group I. In that sense, these elements might be described as possessing properties transitional from one row of the table to the next.In the following questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices on the basis of the above passage.Assertion (

Copper is the most noble of the first row transition metals and occurs in small deposits in several countries. Ores of copper include chalcanthite (CuSO4.5H2O), atacamite (Cu2CI(OH)3), cuprite (Cu2O), copper glance (Cu2S) and malachite (Cu2(OH)2CO3). However, 80% of the world copper production comes from the ore chalcopyrite (CuFeS2). The extraction of copper from chalcopyrite involves partial roasting, removal of iron and self-reduction.Q.In self-reduction, the reducing species isa)Sb)O2-c)S2-d)SO2Correct answer is option 'C'. Can you explain this answer?
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Copper is the most noble of the first row transition metals and occurs in small deposits in several countries. Ores of copper include chalcanthite (CuSO4.5H2O), atacamite (Cu2CI(OH)3), cuprite (Cu2O), copper glance (Cu2S) and malachite (Cu2(OH)2CO3). However, 80% of the world copper production comes from the ore chalcopyrite (CuFeS2). The extraction of copper from chalcopyrite involves partial roasting, removal of iron and self-reduction.Q.In self-reduction, the reducing species isa)Sb)O2-c)S2-d)SO2Correct answer is option 'C'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Copper is the most noble of the first row transition metals and occurs in small deposits in several countries. Ores of copper include chalcanthite (CuSO4.5H2O), atacamite (Cu2CI(OH)3), cuprite (Cu2O), copper glance (Cu2S) and malachite (Cu2(OH)2CO3). However, 80% of the world copper production comes from the ore chalcopyrite (CuFeS2). The extraction of copper from chalcopyrite involves partial roasting, removal of iron and self-reduction.Q.In self-reduction, the reducing species isa)Sb)O2-c)S2-d)SO2Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Copper is the most noble of the first row transition metals and occurs in small deposits in several countries. Ores of copper include chalcanthite (CuSO4.5H2O), atacamite (Cu2CI(OH)3), cuprite (Cu2O), copper glance (Cu2S) and malachite (Cu2(OH)2CO3). However, 80% of the world copper production comes from the ore chalcopyrite (CuFeS2). The extraction of copper from chalcopyrite involves partial roasting, removal of iron and self-reduction.Q.In self-reduction, the reducing species isa)Sb)O2-c)S2-d)SO2Correct answer is option 'C'. Can you explain this answer?.
Solutions for Copper is the most noble of the first row transition metals and occurs in small deposits in several countries. Ores of copper include chalcanthite (CuSO4.5H2O), atacamite (Cu2CI(OH)3), cuprite (Cu2O), copper glance (Cu2S) and malachite (Cu2(OH)2CO3). However, 80% of the world copper production comes from the ore chalcopyrite (CuFeS2). The extraction of copper from chalcopyrite involves partial roasting, removal of iron and self-reduction.Q.In self-reduction, the reducing species isa)Sb)O2-c)S2-d)SO2Correct answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 12. Download more important topics, notes, lectures and mock test series for Class 12 Exam by signing up for free.
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