Question

For the cell reaction to be spontaneous the EMF of the cell should be:

• A. negative
• B. positive
• C. zero
• D. some times positive and some times negative

Answer 1

The correct option is B positive

If EMF of cell is positive, then the $\Delta$ G of the overall reaction is less than zero.
$\Delta G=-nF{E}_{cell}$
$\therefore$ If $E_{cell}$ is positive, then reaction is spontaneous

Hence, option B is correct.