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Some indian scientists tried to use a me...

Some indian scientists tried to use a metal x for electroplating iron pillar in mehrauli but they ended up with `E_(cell)` of the reaction to be negative they concluded that

A

Reaction is spontaneous

B

Reaction is non-spontaneous

C

Reaction is reversible

D

Reaction is non-reversible

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For a sponaneous reaction, the free energy change must be negative, Delta G=Delta H-T Delta S, Delta H is the enthalpy change during the reaction. T is the absolute temperature, and Delta S is the change in entropy during the reaction. Consider a reaction such as the formation of an oxide M+O_(2) to MO Dioxygen is used up 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 S (entropy or randomness) decreases, hence Delta S is negative. Thus, if the temperature is raised then T Delta S becomes more negative,Since, TDelta S is substracted in the equation, then Delta G becomes less negative. Thus, the free energy change increases with the increase in temperature. The free energy changes that occur when one mole of common reactant (in this case dioxygen) is used may be plotted graphically aginst 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 Ca(s) which of the following represent the Delta G vs. T ?

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AAKASH INSTITUTE ENGLISH-ELECTROCHEMISTRY -Assignment (SECTION B) Objective Type Questions (One option is correct)
  1. The E("cell") of the reaction MnO(4)^(-)+Fe^(+2)+H^(+)rarrMn^(2+)+H(...

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  2. A current of 2.0A passed for 5 hours through a molten metal salt depos...

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  3. Some indian scientists tried to use a metal x for electroplating iron ...

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  4. The equilibrium constant for the reaction Sr(s)+Mg^(+2)(aq)rarr Sr^(+2...

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  5. 0.5 faraday of electricity was required to deposit all the copper in 5...

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  6. Cu^(+) ion is not stable in aqueous solution because because of dispro...

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  7. 25 gm of a metal is deposited on cathode during the electrolysis of me...

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  8. A well stirred solution of 0.1 M CuSO(4) is electrolysed at 25^(@)C us...

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  9. 50 ML of a buffer of 1 M NH(3) and 1 M NH(4)^(+) are placed in two vol...

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  10. The specific conductance of saturated solution os silver chloride is k...

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  11. The limiting equivalent conductivity of NaCl, KCl and KBr are 126.5,1...

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  12. The equivalent conductances of CH(3)COONa, HCI "and" NaCI at infinit e...

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  13. E^(@)(Na^(+)//Na)=-2.71V E^(@)(Mg^(+2)//Mg)=-2.37V E^(@)(Fe^(+2)//Fe...

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  14. Which of following type of plot would you expect from the titratin of ...

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  15. The standard reduction potential of Cu^(2+)//Cu and Cu^(2+)//Cu^(+) ar...

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  16. What is DeltaG^(@) for the following reaction Cu^(+2)(aq)+2Ag(s)rarr...

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  17. For the half cell At pH = 3 electrode potential is

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  18. Rate of corrosion I maximum when

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  19. H(2)(1 "atm")|2.26 M HCOOH||0.222MCH(3)COOH|(1 "atm")H(2)K(a)(HCOOH)=...

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  20. Given that NiO(2)+4H^(+)+2e^(-)rarrNi^(2+)+2H(2)O,E^(@)=1.678V NiO...

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