The magnitude of the change in oxidising power of the couple is x × 10 V, if the H concentration is — Electrochemistry Chemistry Question

Question

The magnitude of the change in oxidising power of the couple is x × 10 V, if the H concentration is decreased from 1 M to 10 M at 25°C. (Assume concentration of and Mn to be same on change in H concentration). The value of x is (Rounded off to the nearest integer) –4 + –4 2+ +