Class 12 Exam > Class 12 Questions > Consider the following statements :Roasting i...
Start Learning for Free
Consider the following statements :
Roasting is carried out to :
(i) convert sulphide to oxide and sulphate (ii) remove water of hydration
(iii) melt the ore (iv) remove arsenic and sulphur impurities
Of these statements :
- a)(i), (ii) and (iii) are correct
- b)(i) and (iv) are correct
- c)(i), (ii) and (iv) are correct
- d)(ii), (iii) and (iv) are correct
Correct answer is option 'C'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
Consider the following statements :Roasting is carried out to :(i) con...
The correct answer is Option C.
ROASTING
The removal of the excess sulphur contained in sulphide ores by heating in an excess of air is called roasting. The concentrated sulphide ore is heated in a reverberatory furnace, below its melting point or fusion temperature in the presence of an excess of air with or without the addition of an external substance.
In roasting definite chemicals like oxidation, chlorination etc. take place but in calcination does not occur any major chemical changes.
Advantages of Roasting :
(i) Excess of sulphur is removed as volatile oxide.
(ii) The metal sulphide is converted into metal oxide and sulphate.
(iii) Impurities of arsenic and antimony are removed as their volatile oxides.
ROASTING
The removal of the excess sulphur contained in sulphide ores by heating in an excess of air is called roasting. The concentrated sulphide ore is heated in a reverberatory furnace, below its melting point or fusion temperature in the presence of an excess of air with or without the addition of an external substance.
In roasting definite chemicals like oxidation, chlorination etc. take place but in calcination does not occur any major chemical changes.
Advantages of Roasting :
(i) Excess of sulphur is removed as volatile oxide.
(ii) The metal sulphide is converted into metal oxide and sulphate.
(iii) Impurities of arsenic and antimony are removed as their volatile oxides.
Most Upvoted Answer
Consider the following statements :Roasting is carried out to :(i) con...
Roasting is a process used in metallurgy to convert sulphide ores into their respective oxides and sulphates. It involves heating the ore in the presence of excess air or oxygen, which leads to various chemical reactions and changes in the composition of the ore.
(i) Conversion of sulphide to oxide and sulphate:
During roasting, the sulphide ores are heated in the presence of oxygen, resulting in the conversion of sulphide to oxide. For example, the roasting of zinc sulphide ore (ZnS) produces zinc oxide (ZnO) according to the reaction:
2ZnS + 3O2 → 2ZnO + 2SO2
In addition, some sulphur is also converted to sulphur dioxide gas (SO2). The oxides and sulphates formed during roasting can then be further processed to extract the desired metal.
(ii) Removal of water of hydration:
Some ores may contain water molecules attached to their crystal structure as water of hydration. Roasting helps in removing this water by heating the ore to high temperatures. For example, the roasting of hydrated iron ore (Fe2O3·xH2O) removes the water molecules and converts it into anhydrous iron oxide (Fe2O3).
(iii) Melting the ore:
Roasting does not typically involve melting the ore. Melting is usually carried out in a separate process called smelting, where the roasted ore is mixed with a reducing agent and heated to a high temperature to extract the metal.
(iv) Removal of arsenic and sulphur impurities:
Roasting can also be used to remove impurities such as arsenic and sulphur from the ore. Arsenic is often present in sulphide ores as an impurity, and roasting helps in converting it into a volatile form (arsenic trioxide) that can be easily separated. Sulphur impurities are also converted into sulphur dioxide gas during roasting.
Therefore, the correct statements are (i), (ii), and (iv). Roasting is used to convert sulphide to oxide and sulphate, remove water of hydration, and remove arsenic and sulphur impurities from the ore.
(i) Conversion of sulphide to oxide and sulphate:
During roasting, the sulphide ores are heated in the presence of oxygen, resulting in the conversion of sulphide to oxide. For example, the roasting of zinc sulphide ore (ZnS) produces zinc oxide (ZnO) according to the reaction:
2ZnS + 3O2 → 2ZnO + 2SO2
In addition, some sulphur is also converted to sulphur dioxide gas (SO2). The oxides and sulphates formed during roasting can then be further processed to extract the desired metal.
(ii) Removal of water of hydration:
Some ores may contain water molecules attached to their crystal structure as water of hydration. Roasting helps in removing this water by heating the ore to high temperatures. For example, the roasting of hydrated iron ore (Fe2O3·xH2O) removes the water molecules and converts it into anhydrous iron oxide (Fe2O3).
(iii) Melting the ore:
Roasting does not typically involve melting the ore. Melting is usually carried out in a separate process called smelting, where the roasted ore is mixed with a reducing agent and heated to a high temperature to extract the metal.
(iv) Removal of arsenic and sulphur impurities:
Roasting can also be used to remove impurities such as arsenic and sulphur from the ore. Arsenic is often present in sulphide ores as an impurity, and roasting helps in converting it into a volatile form (arsenic trioxide) that can be easily separated. Sulphur impurities are also converted into sulphur dioxide gas during roasting.
Therefore, the correct statements are (i), (ii), and (iv). Roasting is used to convert sulphide to oxide and sulphate, remove water of hydration, and remove arsenic and sulphur impurities from the ore.
|
Explore Courses for Class 12 exam
|
|
Similar Class 12 Doubts
Consider the following statements :Roasting is carried out to :(i) convert sulphide to oxide and sulphate (ii) remove water of hydration(iii) melt the ore (iv) remove arsenic and sulphur impuritiesOf these statements :a)(i), (ii) and (iii) are correctb)(i) and (iv) are correctc)(i), (ii) and (iv) are correctd)(ii), (iii) and (iv) are correctCorrect answer is option 'C'. Can you explain this answer?
Question Description
Consider the following statements :Roasting is carried out to :(i) convert sulphide to oxide and sulphate (ii) remove water of hydration(iii) melt the ore (iv) remove arsenic and sulphur impuritiesOf these statements :a)(i), (ii) and (iii) are correctb)(i) and (iv) are correctc)(i), (ii) and (iv) are correctd)(ii), (iii) and (iv) are correctCorrect 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 Consider the following statements :Roasting is carried out to :(i) convert sulphide to oxide and sulphate (ii) remove water of hydration(iii) melt the ore (iv) remove arsenic and sulphur impuritiesOf these statements :a)(i), (ii) and (iii) are correctb)(i) and (iv) are correctc)(i), (ii) and (iv) are correctd)(ii), (iii) and (iv) are correctCorrect 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 Consider the following statements :Roasting is carried out to :(i) convert sulphide to oxide and sulphate (ii) remove water of hydration(iii) melt the ore (iv) remove arsenic and sulphur impuritiesOf these statements :a)(i), (ii) and (iii) are correctb)(i) and (iv) are correctc)(i), (ii) and (iv) are correctd)(ii), (iii) and (iv) are correctCorrect answer is option 'C'. Can you explain this answer?.
Consider the following statements :Roasting is carried out to :(i) convert sulphide to oxide and sulphate (ii) remove water of hydration(iii) melt the ore (iv) remove arsenic and sulphur impuritiesOf these statements :a)(i), (ii) and (iii) are correctb)(i) and (iv) are correctc)(i), (ii) and (iv) are correctd)(ii), (iii) and (iv) are correctCorrect 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 Consider the following statements :Roasting is carried out to :(i) convert sulphide to oxide and sulphate (ii) remove water of hydration(iii) melt the ore (iv) remove arsenic and sulphur impuritiesOf these statements :a)(i), (ii) and (iii) are correctb)(i) and (iv) are correctc)(i), (ii) and (iv) are correctd)(ii), (iii) and (iv) are correctCorrect 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 Consider the following statements :Roasting is carried out to :(i) convert sulphide to oxide and sulphate (ii) remove water of hydration(iii) melt the ore (iv) remove arsenic and sulphur impuritiesOf these statements :a)(i), (ii) and (iii) are correctb)(i) and (iv) are correctc)(i), (ii) and (iv) are correctd)(ii), (iii) and (iv) are correctCorrect answer is option 'C'. Can you explain this answer?.
Solutions for Consider the following statements :Roasting is carried out to :(i) convert sulphide to oxide and sulphate (ii) remove water of hydration(iii) melt the ore (iv) remove arsenic and sulphur impuritiesOf these statements :a)(i), (ii) and (iii) are correctb)(i) and (iv) are correctc)(i), (ii) and (iv) are correctd)(ii), (iii) and (iv) are correctCorrect 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.
Here you can find the meaning of Consider the following statements :Roasting is carried out to :(i) convert sulphide to oxide and sulphate (ii) remove water of hydration(iii) melt the ore (iv) remove arsenic and sulphur impuritiesOf these statements :a)(i), (ii) and (iii) are correctb)(i) and (iv) are correctc)(i), (ii) and (iv) are correctd)(ii), (iii) and (iv) are correctCorrect answer is option 'C'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
Consider the following statements :Roasting is carried out to :(i) convert sulphide to oxide and sulphate (ii) remove water of hydration(iii) melt the ore (iv) remove arsenic and sulphur impuritiesOf these statements :a)(i), (ii) and (iii) are correctb)(i) and (iv) are correctc)(i), (ii) and (iv) are correctd)(ii), (iii) and (iv) are correctCorrect answer is option 'C'. Can you explain this answer?, a detailed solution for Consider the following statements :Roasting is carried out to :(i) convert sulphide to oxide and sulphate (ii) remove water of hydration(iii) melt the ore (iv) remove arsenic and sulphur impuritiesOf these statements :a)(i), (ii) and (iii) are correctb)(i) and (iv) are correctc)(i), (ii) and (iv) are correctd)(ii), (iii) and (iv) are correctCorrect answer is option 'C'. Can you explain this answer? has been provided alongside types of Consider the following statements :Roasting is carried out to :(i) convert sulphide to oxide and sulphate (ii) remove water of hydration(iii) melt the ore (iv) remove arsenic and sulphur impuritiesOf these statements :a)(i), (ii) and (iii) are correctb)(i) and (iv) are correctc)(i), (ii) and (iv) are correctd)(ii), (iii) and (iv) are correctCorrect answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Consider the following statements :Roasting is carried out to :(i) convert sulphide to oxide and sulphate (ii) remove water of hydration(iii) melt the ore (iv) remove arsenic and sulphur impuritiesOf these statements :a)(i), (ii) and (iii) are correctb)(i) and (iv) are correctc)(i), (ii) and (iv) are correctd)(ii), (iii) and (iv) are correctCorrect answer is option 'C'. Can you explain this answer? tests, examples and also practice Class 12 tests.
|
|
Explore Courses for Class 12 exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup