# Chemistry Class 12 NCERT Solutions: Chapter 3 Electrochemistry Part 5

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Q: 5. Write the Nernst equation and emf of the following cells at 298 K:

(i)

(ii)

(iii)

(iv)

Answer:

(i) For the given reaction, the nernst equation can be given as:

(ii) For the given reaction, the nernst equation can be given as:

(iii) For the given reaction, the Nernst equation can be given as:

(iv) For the given reaction, the Nernst equation can be given as:

Q: 6. In the button cells widely used in watches and other devices the following reaction takes place:

Determine and for the reaction.

Ans:

We know that,