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Given : Co^(3+)+e^(-)rarr Co^(2+), E^(...

Given :
`Co^(3+)+e^(-)rarr Co^(2+), E^(@)=+1.181V`
`Pb^(4+)+2e^(-)rarrPb^(2+),E^(@)=+1.67V`
`Ce^(4+)+e^(-) rarr Ce^(3+), E^(@)=+1.61V`
`Bi^(3+)+3e^(-)rarr Bi^(3+)+3e^(-)rarr Bi, E^(@)=+2.20V`
Oxidizing power of the species will increase in the order:

A

`Ce^(4+) lt Pb^(4+) lt Bi^(3+) lt Co^(3+)`

B

`Co^3+ lt Pb^(4+) lt Ce^(4+) lt Bi^(3+)`

C

`Co^(3+) lt Ce^(4+) lt Bi^(3+) lt Pb^(4+)`

D

`Bi^(3+) lt Ce^(4+) lt Pb^(4+) lt Co^(3+)`

Text Solution

Verified by Experts

The correct Answer is:
D
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Given : Co^(3+) + e^(-) to Co^(2+) , E^(@) = +1.81V pb^(4+) + 2e^(-) rightarrow Pb^(2+) , E^(@) = + 1.67V Ce^(4)+ e^(-)rightarrow Ce^(3+), E^(@) = +1.61V Ce^(4)+3e^(-)rightarrow Bi , E^(@) = + 0.20V Oxidation power of the species will increase in the order:

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Given that, Co^(3+) +e^(-)rarr Co^(2+) E^(@) = +1.82 V 2H_(2)O rarr O_(2) +4H^(+) +4e^(-), E^(@) =- 1.23 V . Explain why Co^(3+) is not stable in aqueous solutions.

MODERN PUBLICATION-ELECTROCHEMISTRY -COMPETITION FILE (OBJECTIVE TYPE QUESTIONS) B MULTIPLE CHOICE QUESTIONS
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  2. 1 litre aqueous solution of NaCl was electrolysed bètweern Pt electrod...

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  3. Two aqueous solutions A and B containing solute CuSO(4) and NaBr respe...

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  4. Given E(Mn^(7+)//Mn^(2+))^(@) and E(Mn^(4+)//Mn^(2+))^(@) are 1.51 V a...

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  5. Calculate EMF of following cell at 298 K Zn|ZnSO(4) (0.1 M) ||CuSO(4...

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  6. The standard electrode potential E^(Theta) and its temperature coeffic...

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  7. Calculate the standard cell potential (in V) of the cell in which foll...

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  8. A solution of Ni(NO(3))(2) is electrolysed between platinum electrode...

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  9. If the standed electrode potential for a cell is 2 V at 300 K, the equ...

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  10. Given : Co^(3+)+e^(-)rarr Co^(2+), E^(@)=+1.181V Pb^(4+)+2e^(-)rar...

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  11. The standard Gibbs energy for the given cell reaction is KJmol^(-1) at...

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  12. In the cell Pt (s) | H(2) (g, 1 " bar")| HCl (aq)| AgCl(s) | Ag(s) | P...

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  13. ^^(m)^(@) for NaCI,HCI and NaA are 126.4,425.9 and 100.5Scm^2 m ol^(-1...

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  14. Which one of the following graphs between molar conductivity (A(m)) ...

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  15. Consider the following reduction processes : Zn^(2+)+2e^(-)toZn(s), ...

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  16. Electrolysis of dilute aqueous NaCl solution was carried out by passin...

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  17. Consider the following cell reaction: 2Fe(s)+O(2) (g) + 4H^(+)(aq)to2F...

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  18. AgNO(3)(aq) was added to an aqueous KCl soltuion gradually and conduct...

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  19. For the following electrochemical cell at 298 k< Pt(s) H(g)(1bar)| H...

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  20. For the following cell , Zn(s)|ZnSO(4)((aq)) CuSO(4)((aq)) |Cu(s) When...

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