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(A): Iron pyrate is used in the extracti...

(A): Iron pyrate is used in the extraction of iron releases pollutants like sulphurdioxide
(R) : Ores which are abundent with non metals produce poluting gases

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are false

Text Solution

Verified by Experts

The correct Answer is:
B
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How do the metals like zinc, iron are extracted from their ores ?

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For a spontaneous reaction, the free energy change must be negative. DeltaG=DeltaH-TDeltaS is the enthalpy change during the reaction. T is absolute temperature, and AS is the change in entropy during the reaction. Consider a reaction such as the formation ofan oxide . M+O_(2) MO Dloxygen is used wp in the course of this reaction. Gases have a more random structure (less ordered) than liquid or solids consequently gases have a higher entropy than liquids and solids, in this reaction (entropy or randomness) decreases, hence is negative. Thus, the temperature is raised the DeltaS becomes more negative. Since, TDeltaS is subtracted in the equation, then SG becomes less negative. Thus, the free energy changes increases with the increase in temperature. The free energy changes that occur when one mole of common reactant in this case dioxygen) is we may e plotted graphically against temperature for a number of reactions of metals to their oxides. The following plot is called an Ellingham diagram for metal oxide. Understanding of Ellingham diagram is extremely important for the efficient extraction of metals. As per the Ellingham diagram of oxides which of the following conclusion is true?

For a spontaneous reaction, the free energy change must be negative. DeltaG=DeltaH-TDelaS is the enthalpy change during the reaction. T is absolute temperature, and AS is the change in entropy during the reaction. Consider a reaction such as the formation ofan oxide . M+O_(2) MO Dloxygen is used wp in the course of this reaction. Gases have a more random structure (less ordered) than liquid or solids consequently gases have a higher entropy than liquids and solids, in this reaction (entropy or randomness) decreases, hence is negative. Thus, the temperature is raised the DeltaS becomes more negative. Since, TDeltaS is subtracted in the equation, then SG becomes less negative. Thus, the free energy changes increases with the increase in temperature. The free energy changes that occur when one mole of common reactant in this case dioxygen) is we may e plotted graphically against temperature for a number of reactions of metals to their oxides. The following plot is called an Ellingham diagram for metal oxide. Understanding of Ellingham diagram is extremely important for the efficient extraction of metals. For the conversion of Ca(s) to CaO(s) which of the following represent the DeltaG vs T :

For a spontaneous reaction, the free energy change must be negative. DeltaG=DeltaH-TDeltaS is the enthalpy change during the reaction. T is absolute temperature, and AS is the change in entropy during the reaction. Consider a reaction such as the formation ofan oxide . M+O_(2) MO Dloxygen is used wp in the course of this reaction. Gases have a more random structure (less ordered) than liquid or solids consequently gases have a higher entropy than liquids and solids, in this reaction (entropy or randomness) decreases, hence is negative. Thus, the temperature is raised the DeltaS becomes more negative. Since, TDeltaS is subtracted in the equation, then SG becomes less negative. Thus, the free energy changes increases with the increase in temperature. The free energy changes that occur when one mole of common reactant in this case dioxygen) is we may e plotted graphically against temperature for a number of reactions of metals to their oxides. The following plot is called an Ellingham diagram for metal oxide. Understanding of Ellingham diagram is extremely important for the efficient extraction of metals. Which of the following elements can be prepared by heating the oxide above 400^(@)C ?

Which of the following reduction is suitable for extraction of crude metal from the ores like K, Na, Mg, etc ?

Silver metal is extracted from Ag_(2) S by cyanide process. The one is concentrated through froth floation process. The concentrated ore is the leached and solution is r ed with reducing agents to get spongy silver which then purified by fusion with an oxidant followed by electrolysis. Which of the following statements about electrolytic refining of silver is not true

Silver metal is extracted from Ag_(2) S by cyanide process. The one is concentrated through froth floation process. The concentrated ore is the leached and solution is r ed with reducing agents to get spongy silver which then purified by fusion with an oxidant followed by electrolysis. Ag is precipitated from an aqueous solution of sodium argentocynide by adding

AAKASH SERIES-PRINCIPLES OF METALLURGY-Objective exercise -4 (Assertion (A) & Reason (R) type questions :
  1. (A): Efficiency of the reverberatary furnace is less (R): The waste ...

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  2. (A): In the smelting of copper pyrites in blast furnace, Cu2 S formed ...

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  3. (A): Iron pyrate is used in the extraction of iron releases pollutants...

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  4. (A) Cassiterite mineral is concentrated by electromagnetic method ...

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  5. (A) Leaching is chemical method used to ore benefication process (R...

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  6. (A): In aluminothermic process, Al reduction increases the heat of the...

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  7. (A) : Sulphide ores are concentrated by froth floatation process. (R...

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  8. (A): Platinum and gold occur in native state in nature. (R): Platinu...

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  9. (A) Levigation is used for the separation of oxide ores from impuriti...

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  10. (A) Calamine is a mineral of calcium (R) Calamine is chemically a s...

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  11. Carnallite is an example of

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  12. (A) Froath floatation process involves adsorption (R) Pure ore is p...

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  13. (A) Wolframite impurities are separated from cassiterite by electrom...

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  14. (A) In smelting, roasted ore is heated with powdered coke in presenc...

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  15. (A) Leaching is the process of converting the ore into oxide and the...

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  16. (A) Aluminium metal is used as a reducing agent in thermite welding ...

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  17. (A) Lead, tin and bismuth are purified by liquation method . (R) Lead...

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  18. (A) Pin oil is fused as a foaming agent in froth floatation process ...

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  19. (A) Aluminium metal can be extracted by the electrolysis of aqueous al...

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  20. (A) Magnesium can not be extracted by electrolysis of aqueous salt s...

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