A reduction reaction with an equilibrium constant of 4.8×10^2. All right, so remember your equilibrium constant here is K, and we're talking about which of the following statements is true. K here is greater than one, which means that it is a spontaneous reaction. Is non spontaneous. We don't need to continue reading. We know that this is not true.
Since K is greater than one, it's spontaneous, has a negative change in my standard Gibbs free energy, and produces electricity. That is true. If it's spontaneous, it's a galvanic cell. Galvanic cells utilize a redox reaction in order to produce electricity. Here the Gibbs free energy would have to be less than 0, making it negative.
Has discharged all electricity and has a dead battery. That only be true if K was equal to 1, which it's not. Is spontaneous. OK, and has a negative standard cell potential. So the first part is true, it is spontaneous, but its standard cell potential should be positive and not negative. So here only option B is correct.
