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The E(M^(3+)//M^(2+)^@ values for Cr, ...

The `E_(M^(3+)//M^(2+)^@` values for ` Cr`, Mn, Fe and ` Co` are ` 0.41, + 1.57 , + 0.77` and `+1, 97 V` respectively. For which one of these metals the change ub oxidation state from ` =2 ` to ` 3` is easiest :

A

`Fe`

B

`Mn`

C

`Cr`

D

`Co`

Text Solution

Verified by Experts

The correct Answer is:
C
Lower the reduction potential or higher the oxidiation potential more easily it can be oxidised. Here, for `Cr^(2+)//Cr^(+3)`. The oxidation potential is maximum, so for `Cr` the change in oxidation state from `+2` to `+3` is easiest.
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The E_(M^(3+)//M^(2+)^@ values for Cr , Mn, Fe and Co are 0.41, + 1.57 , + 0.77 and +1, 97 V respectively. For which one of these metals the change in oxidation state from =2 to 3 is easiest :

The E_(M^(3+)//M^(2+))^(@) values for Cr,Mn,Fe andCo are 0.41,+1.57,+0.77 and +1.97 V respectively .For which one of these metal the change in oxidation state from +2 to +3 is easiest:

How many of these metals can show +3 oxidation state also. Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Zn

E^(Theta) value for the couple Cr^(3+)//Cr^(2+) and Mn^(3+)//Mn^(2+) are -0.41 and +1.51 volts respectively. Considering these value select the correct option from the following statements.

ALLEN-ELECTROCHEMISTRY-EXERCISE-05 [A]
  1. Stadard reduction electrode potentials of three metals A,B and C are r...

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  2. For a cell reaction involving a two-electron change, the standard e.m...

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  3. The E(M^(3+)//M^(2+)^@ values for Cr, Mn, Fe and Co are 0.41, + 1....

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  4. In a cell that utilises the reaction. Zn(s) +2H^(+)(aq) rarr Zn^(2+)...

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  5. The limiting molar conductivities A^(@) for NaCl,KBr nd KCl are 126,15...

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  6. The standard e.m.f. of a cell involving one electron change is found t...

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  7. Consider the following E^o values : E^o Fe^(3+)//FE^(2+)o = + 0.77 ...

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  8. {:("Electrolyte",^^.^(oo)(Scm^(2)mol^(-1))),(KCI,149.9),(KNO(3),145.0)...

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  9. The highest electrical conductivity of the following aqueous solutions...

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  10. Aluminium oxide may be electorlysed at 1000^@C to furnish aluminim met...

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  11. For a spontaneous reaction, DeltaG , equilibrium constant (K) and E(ce...

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  12. The molar conductivities Lambda(NaOAc)^@ and Lambda(HCI)^@ at infinite...

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  13. The resistance of a conductivity cell filled with 0.1 M KCl solution i...

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  14. At 25^(@)C, {:(Ag+I^(-)rarr,AgI+e,,E^(@) =0.152V),(Agrarr,Ag.^(+)+e,,E...

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  15. The cell , Zn | Zn^(2+) (1M) || Cu^(2+) (1M) Cu (E("cell")^@ = 1. 10 V...

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  16. Given E(Cr^(3+)//cr)^@ =- 0.72 V, E(Fe^(2+)//Fe)^@ =- 0.42 V. The pote...

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  17. Given,{:(E(Fe^(3+) //Fe)^o + 3e Cr E^o =- 0.036 V),(E(Fe^(3+) //Fe)^o...

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  18. The Gibbs energy for the decomposition of Al(2)O(3) at 500^(@)C is as ...

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  19. Resistance of 0.2 M solution of an electrolyte is 50 Omega. The specif...

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  20. The reduction potential of hydrogen half cell will be negative if :

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