Question

What does he negative value of Ecell indicate

Answer 1

A positive value indicates the oxidation-reduction reaction is a spontaneous reaction. That means without the help of an external agency. Here reduction at the cathode and oxidation at the anode takes place. If it is a negative value, it means only the reverse reaction is spontaneous. It means oxidation at the cathode and reduction at the anode.

Answer 2

Reverse reaction is spontaneous.