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Standard Electrode Potentials

If reduction ...

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If reduction potential of an element is negative of oxidation potential, then why the oxidation potential of water is -1.23 and its reduction potential is -0.83?

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If there is no mention of oxidation and reduction potential in the problem we assume it to be reduction potential. why?

Q. What is the oxidation potential of

C u (s)

, if the standard reduction potential of

{C u}^{2 +} (a q)

+ 0.34 V

?

If the reduction potential $N i \to N i^{2 +} + 2 e^{-}$ is $- 0.25 V$ . ___ V is its oxidation potential.

Q. Assertion :If SOP of substance is less than

- 1.23 V

and over voltage

= 0 V

, then its oxidation in its aqueous solution is not possible at

298 K

. Reason: Standard reduction potential (SRP) of water is

+ 1.23 V

.

Q. Consider the following relations for emf of an electrochemical cell :

(i) EMF of cell = (Oxidation potential of anode) - (Reduction potential of cathode)
(ii) EMF of cell = (Oxidation potential of anode) + (Reduction potential of cathode)
(iii) EMF of cell = (Reduction potential of anode) + (Reduction potential of cathode)
(iv) EMF of cell = (Oxidation potential of anode) - (Oxidation potential of cathode)

Which of the above relation(s) is correct?

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