What is the emf of the cell when the cell reaction attains equilibrium ?

Explanation

To find the EMF of the cell when the cell reaction attains equilibrium, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding EMF and Equilibrium**:
- The electromotive force (EMF) of a cell is a measure of the energy provided by the cell per coulomb of charge. At equilibrium, the cell reaction has reached a state where the forward and reverse reactions occur at the same rate.

2. **Using the Nernst Equation**:
...