Question

Example of reversible and irreversible redox couple

Answer 1

@  A very simple example can be of two metal jars A and B which are at a thermal equilibrium and are in contact with each other. Now when we heat jar A slightly, heat starts to flow from Jar A to Jar B. This is the direction of this process. Now this process can be reversed just by cooling Jar A slightly. When Jar A is cooled, heat flows from Jar B to Jar A till thermal equilibrium is reached.

@ when we are driving the car uphill, it consumes a lot of fuel and this fuel is not returned when we are driving down hill. Many factors contribute in making any process irreversible.