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Which of the following statements about the advantage of roasting of sulphide ore before reduction is not true?
  • a)
    The ΔGf° of the sulphide is greater than those for CS2 and H2S.
  • b)
    The ΔGf° of is negative for roast in g of sulphide ore to oxide.
  • c)
    Roasting of the sulphide to the oxide is thermodynamically feasible.
  • d)
    Carbon and hydrogen are suitable reducing agents for metal sulphides.
Correct answer is option 'D'. Can you explain this answer?
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Which of the following statements about the advantage of roasting of ...
Advantage of Roasting of Sulphide Ore Before Reduction

Roasting of sulphide ore is a process in which the sulphide ore is heated in the presence of air or oxygen to convert the sulphide ore into oxide. This process is followed by the reduction of the metal oxide to obtain the metal. The advantage of roasting of sulphide ore before reduction are:

a) The ΔGf° of the sulphide is greater than those for CS2 and H2S: The Gibbs free energy change (ΔGf°) of the sulphide is greater than those for CS2 and H2S. Therefore, roasting of sulphide ore is preferred before reduction.

b) The ΔGf° of is negative for roast in g of sulphide ore to oxide: The Gibbs free energy change (ΔGf°) of the roasting process is negative for the conversion of sulphide ore into oxide. Hence, the roasting of sulphide ore to oxide is a thermodynamically feasible process.

c) Roasting of the sulphide to the oxide is thermodynamically feasible: The roasting of sulphide ore to oxide is a thermodynamically feasible process. This process is followed by the reduction of the metal oxide to obtain the metal.

d) Carbon and hydrogen are suitable reducing agents for metal sulphides: This statement is not true. Carbon and hydrogen are not suitable reducing agents for metal sulphides. The reduction of metal sulphides by carbon or hydrogen is not feasible as the reduction of metal sulphides requires a more powerful reducing agent such as aluminium or magnesium.

In conclusion, the advantage of roasting of sulphide ore before reduction is that it converts the sulphide ore into oxide which is then reduced to obtain the metal. Carbon and hydrogen are not suitable reducing agents for metal sulphides.
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Which of the following statements about the advantage of roasting of ...
The sulphide ore is roasted to oxide before reduction because the ΔGf° of most of the sulphides are greater than those of CS2 and H2S, therefore neither C nor H can reduce metal sulphide to metal. Further, the standard free energies o f formation o f oxide are much less than those o f SO2. Hence oxidation of metal sulphides to metal oxide is thermodynamically favourable.
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Read the passage given below and answer the following questions:The rate of a reaction, which may also be called its velocity or speed, can be defined with relation to the concentration of any of the reacting substances, or to that of any product of the reaction. If the species chosen is a reactant which has a concentration c at time t the rate is - dc/dt, while the rate with reference to a product having a concentration x at time t is dx/dt. Any concentration units may be used for expressing the rate; thus, if moles per liter are employed for concentration and seconds for the time, the units for the rate are moles litre–1sec–1. For gas reactions pressure units are sometimes used in place of concentrations, so that legitimate units for the rate would be (mm. Hg) sec–1 and atm. sec–1 The order of a reaction concerns the dependence of the rate upon the concentrations of reacting substances; thus, if the rate is found experimentally to be proportional to the ath power of the concentration of one of the reactants A, to the both power of the concentration of a second reactant B, and so forth, via., rate = k CAα CAβ the over-all order of the reaction is simply n = α + β + ----- (2) Such a reaction is said to be of the αth order with respect to the substance A, the βth order with respect to B.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: Rate of reaction is a measure of change in concentration of reactant with respect to time.Reason: Rate of reaction is a measure of change in concentration of product with respect to time.

Read the passage given below and answer the following questions:The rate of a reaction, which may also be called its velocity or speed, can be defined with relation to the concentration of any of the reacting substances, or to that of any product of the reaction. If the species chosen is a reactant which has a concentration c at time t the rate is - dc/dt, while the rate with reference to a product having a concentration x at time t is dx/dt. Any concentration units may be used for expressing the rate; thus, if moles per liter are employed for concentration and seconds for the time, the units for the rate are moles litre–1sec–1. For gas reactions pressure units are sometimes used in place of concentrations, so that legitimate units for the rate would be (mm. Hg) sec–1 and atm. sec–1 The order of a reaction concerns the dependence of the rate upon the concentrations of reacting substances; thus, if the rate is found experimentally to be proportional to the ath power of the concentration of one of the reactants A, to the both power of the concentration of a second reactant B, and so forth, via., rate = k CAα CAβ the over-all order of the reaction is simply n = α + β + ----- (2) Such a reaction is said to be of the αth order with respect to the substance A, the βth order with respect to B.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: The unit of k is independent of order of reaction.Reason: The unit of k is moles L–1s–1.

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Which of the following statements about the advantage of roasting of sulphide ore before reduction is not true?a)The ΔGf° of the sulphide is greater than those for CS2 and H2S.b)The ΔGf° of is negative for roast in g of sulphide ore to oxide.c)Roasting of the sulphide to the oxide is thermodynamically feasible.d)Carbon and hydrogen are suitable reducing agents for metal sulphides.Correct answer is option 'D'. Can you explain this answer?
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Which of the following statements about the advantage of roasting of sulphide ore before reduction is not true?a)The ΔGf° of the sulphide is greater than those for CS2 and H2S.b)The ΔGf° of is negative for roast in g of sulphide ore to oxide.c)Roasting of the sulphide to the oxide is thermodynamically feasible.d)Carbon and hydrogen are suitable reducing agents for metal sulphides.Correct answer is option 'D'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Which of the following statements about the advantage of roasting of sulphide ore before reduction is not true?a)The ΔGf° of the sulphide is greater than those for CS2 and H2S.b)The ΔGf° of is negative for roast in g of sulphide ore to oxide.c)Roasting of the sulphide to the oxide is thermodynamically feasible.d)Carbon and hydrogen are suitable reducing agents for metal sulphides.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements about the advantage of roasting of sulphide ore before reduction is not true?a)The ΔGf° of the sulphide is greater than those for CS2 and H2S.b)The ΔGf° of is negative for roast in g of sulphide ore to oxide.c)Roasting of the sulphide to the oxide is thermodynamically feasible.d)Carbon and hydrogen are suitable reducing agents for metal sulphides.Correct answer is option 'D'. Can you explain this answer?.
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