MCQ
The reaction is spontaneous if the cell potential is
- APositive
- BNegative
- CZero
- DInfinite
✓
Answer
$(a)$ $EMF =$ [$s.r.p.$ 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
$EMF$ $= 0.34 \,-(-0.76) = 1.1\,volt$ .
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