The reaction is spontaneous if the cell potenital is .

Options

A. Positive
B. Negative
C. Zero
D. Infinite

Answer

A

Explanation

EMF=[s.r.p. of cathode-s.r.p. of anode]
Where s.r.p.=Standard reduction potential
IF EMF is positive then the reaction is spontaneous
For e.g. in Galvanic cell
(a) EMF=1.1 volt
(b) Cathode is made of copper
(c) Anode is made of Zinc
EMF=0.34 (-0.76)=1.1 volt