Question

Which of the changes to a voltaic cell of the general form X + + Y ⟶ X + Y + would result in an increase in the cell potential (i.e., more positive E cell )? an increase in active ion concentration at the anode an increase in temperature when K / Q < 1 an increase in temperature when K / Q > 1 an increase in active ion concentration at the cathode

Answer 1

Answer: Option (c) is the correct answer.

Explanation:

In an electrochemical cell, the potential difference present within the two half cells is known as cell potential.

Formula for cell potential according to Nernst equation is as follows.

      $E^{o}_{cell} = E^{o} - \frac{2.303RT}{nF} log (\frac{\text{Anodic ion conc.}}{\text{Cathodic ion conc.}})$

Therefore, when an increase in the cell potential (i.e., more positive E cell ) at the cathode takes place then there occurs an overall increase in the cell potential.

Also, when $\frac{K}{Q} > 1$ then also an increase in temperature will lead to increase in the cell potential.

Thus, we can conclude that out of the given options an increase in temperature when $\frac{K}{Q}$ > 1, would result in an increase in the cell potential (i.e., more positive E cell).