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23 June, 23:56

For a reaction in a galvanic cell both ΔH° and ΔS° are positive. Which of the following statements is true?

Δ G° > 0 for all temperatures

ℰ°cell and ℰcell will be the same at all temperatures

ℰ°cell will increase with an increase in temperature

ℰ°cell will not change when the temperature increases

ℰ°cell will decrease with an increase in temperature

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  1. 24 June, 03:23
    0
    Option C is the correct statement.

    ℰ°cell will increase with an increase in temperature

    Explanation:

    To understand this problem it is neccessarry to state the relatioonships between the various paramenters mentioned in the question. these parameters include ΔH°, ΔS°, ΔG° and ℰ°Cell.

    ΔH°, ΔS°, ΔG° are related with the following equation;

    ΔG° = ΔH° - TΔS°

    From the above equation we see that ΔG° cannot be greater than 0 for all temperatures. At higher temperatures, ΔG° becomes a negative value.

    A spontaneous redox reaction is characterized by a negative value of ΔG and a positive value of ℰ°Cell, consistent with our earlier discussions. When both reactants and products are in their standard states, the relationship between ΔG° and ℰ°Cell is as follows:

    ΔG∘=-nFℰ°Cell where;

    F = Faraday and n = number of moles

    Since ΔG° becomes negative at higher temperatures, it means ℰ°Cell would increase as temperature increases.

    The relationship between G, Ecell and temperature can be given as;

    Increase in Temperature = Negative value of G = Increase in E

    Due to the fact established above; options B, D and E are false. This means the correct option is option C - ℰ°cell will increase with an increase in temperature
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