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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 & R are true, R is the correct explanation of A

B

Both A & R are true, R is not correct explanation of A

C

A is true, R is false

D

A is false, R is true

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

The heating process for the extraction of elements are quite old but highly acceptable method for the extraction of elements. Become in this process the elements produced is in the highly pure state. Mostly As, Sb,Ni, Zr,B etc are prepared by this principle 4 mumber of metal sulphides which may be reated first in air to partially convert them to the aride, and then further roasted in the absence of air, wing self reduction. The H_(2) (g) is not widely used as a reducing agent because

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-1
  1. (A) : Cassiterite mineral is concentrated by electromagnetic method ...

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  2. (A) Efficiency of the reverboratary furnace is less (R) The waste...

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  3. (A): In the smelting of copper pyrites in blast furace, Cu(2)S formed ...

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

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  5. (A) Reduction of a metal oxide is easier if the metal formed is in liq...

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

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  7. (A): Hydrated oxides are usually subjected to roasting (R) : Hydrate...

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

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  9. (A): High purity gallium for semiconducting purpose can be obtained by...

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  10. (A): Copper metal can be extracted by electrolysis even from aqueous s...

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  11. (A): Last traces of lead from silver is removed by cupellation (R): ...

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  12. (A): Zinc can be refined from lead by distillation (R): Vapour press...

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  13. (A): Metals like Sn and Pb can be refined by liquation (R) : Sn and ...

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  14. (A): Mond's process is used to refine nickel metal (R) : With carbon...

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  15. (A): Corrosion involves the oxidation of metal (R): Oxidised form of...

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  16. (A): Silver cyanide complex is treated with zinc to precipitate silver...

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

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

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

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  20. (A): Graphite is an example of neutral refractory material used in fur...

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