Chemistry Class 12 NCERT Solutions: Chapter 3 Electrochemistry Part 4

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Q: 3. Depict the galvanic cell in which the reaction takes place. Further show:

(i) Which of the electrode is negatively charged?

(ii) The carriers of the current in the cell.

(iii) Individual reaction at each electrode.

Answer:

The galvanic cell in which the given reaction takes place is depicted as:

(i) Electrode (anode) is negatively charged.

(ii) Ions are carriers of current in the cell and in the external circuit, current will flow from silver to zinc.

(iii) The reaction-taking place at the anode is given by,

The reaction-taking place at the cathode is given by,

Q: 4: Calculate the standard cell potentials of galvanic cells in which the following reactions take place:

(i)

(ii)

Calculate the ¸ and equilibrium constant of the reactions.

Answer:

(i)

(ii)

The galvanic cell of the given reaction is depicted as:

Now, the standard cell potential is

In the given equation,

Then,

Again,

(ii)

The galvanic cell of the given reaction is depicted as:

Now, the standard cell potential is

Here,

Then,

Again,