Identify the correct statement from the options given below for the galvanic cell :

Options

A. Cathode in a voltaic cell loose weight during reaction
B. `Delta G` is positive for spontaneous cell reaction in voltaic cell
C. The voltaic cell is working in reverse direction if the e.m.f of a cell is negative
D. The cell reaction is spontaneous in galvanic cell if `E_("cell")` is less than external potential applied in cell

Answer

C

Explanation

This option is correct statement if the emf. of a voltaic cell is negative, it means emf is positive for reverse reaction and reverse reaction is spontaneous, and cell is working in reverse direction.