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What is the EMF of a galvanic cell if the standard reduction potential of the reduction half-reaction is -0.38 volts and the standard reduction potential of the oxidation half-reaction is 0.52 volts?(a) -0.9 volts(b) -0.6 volts(c) 0.9 volts(d) 0.6 voltsI have been asked this question in quiz.My doubt stems from Electrochemistry in portion Electrochemistry of Chemistry – Class 12

Answer»

Right choice is (a) -0.9 VOLTS

The EXPLANATION is: Given,

STANDARD REDUCTION potential of the reduction half reaction = -0.38 volts

Standard reduction potential of the oxidation half reaction = 0.52 volts

Standard EMF of the cell = [Standard reduction potential of the reduction half reaction] – [Standard reduction potential of the oxidation half reaction]

= -0.38 – (0.52)

= -0.9 volts.


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