The incorrect statement about an inert electrode in a cell is:

1. It does not participate in the cell reaction.
2. It provides a surface either for oxidation or for the reduction reaction.
3. It provides a surface for the conduction of electrons.
4. It provides a surface for redox reaction.

HINT: Inert electrode is non-reactive.
Explanation:
 
An inert electrode in a cell provides a surface for either oxidation or reduction reaction by conduction of electrons through its surface but does not participate in the cell reaction.
 
An inert electrode doesn’t participate in redox reaction and acts only as a source or sink for electrons.
 
It does not provide a surface for redox reactions.