Why is terminal voltage of a cell less than its emf ?

Why is the terminal voltage of a cell is less than its emf?

The terminal voltage of a cell is greater than its emf, when it is

The terminal voltage of a cell is greater tha its emf. When it is

The terminal voltage across a cell is more than its emf if an another cell of:-

Choose correct alternative. The terminal voltage across a cell is more than its emf if the another cell of

Assertion: Terminal voltage of a cell is greater than emf of cell during charging of the cell. Reason: The emf of a cell is always greater than its terminal voltage.

Assertion: Terminal voltage of a cell is greater than emf of cell during charging of the cell. Reason: The emf of a cell is always greater than its terminal voltate.