Question

Which of the following statements are correct regarding the galvanic cell?

• A. A reaction is spontaneous from left to right if $E_{cell}>0$
• B. A reaction occurs from right to left if $E_{cell}<0$
• C. If the system is at equilibrium no net reaction occurs
• D. $E_{cell}$ is temperature-independent

Answer 1

Answer: (A), (B), (C)

A reaction occurs from right to left if $E_{cell}<0$
If the system is at equilibrium no net reaction occurs
A reaction is spontaneous from left to right if $E_{cell}>0$

If the system is at equilibrium then $E=0$ so no net reaction occurs.
Also, from nernst equation it is clear that Ecell is temperature-dependent.
A reaction is spontaneous from left to right if Ecell>0 and reaction goes forward.
Also, reaction occurs from right to left if Ecell<0.