Which metal pairs when coupled will get maximum emf for a voltaic cell?

Fe and Cu

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Pb and Cu

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Cu and Au

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Ca and Cu

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Solution

The correct option is D Ca and Cu
According to the electrochemical series, the maximum modulus of difference in SRP of the metals occurs in the case of Ca and Cu.
$∴ E_{c e l l} = S R P_{c a t h o d e} - S R P_{a n o d e}$ is maximum when,
$E_{c e l l} = S R P_{C u} - S R P_{C a}$
[Note: Most and least reactive metal]
Option D is correct.

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Similar questions

Q. Which of the following of metals, when coupled, will give maximum EMF for a voltaic cell?
Given:

A u^{+} (a q) + e^{-} \to A u (s); E^{0} = 1.69 V

C u^{2 +} (a q) + 2 e^{-} \to C u (s); E^{0} = 0.34 V

P b^{2 +} (a q) + 2 e^{-} \to P b (s); E^{0} = - 0.13 V

F e^{2 +} (a q) + 2 e^{-} \to F e (s); E^{0} = - 0.44 V

C a^{2 +} (a q) + 2 e^{-} \to C a (s); E^{0} = - 2.87 V

Question 16
If copper is kept in open air, it slowly loses its shining brown surface and gains a green coating. It is due to the formation of
(a) ${CuSO}_{4}$
(b) ${CuCO}_{3}$
(c) ${Cu(NO}_{3})_{2}$
(d) $CuO$

Q. For a given temperature difference, which of the following pairs will generate maximum thermo emf?

What visible change is observed when $C O_{2}$ is passed through lime water and that change is due to the formation of which compound?

Q. Find the thermo emf developed in a Cu-Ag thermocouple when the junctions are kept at

0^{o} C

and

40^{o} C

α

for Cu and Ag is 2.76 and 2.5

μ V /^{o} C

and

β

for both Cu and Ag is 0.012

μ V / (^{o} C)^{2}

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Which metal pairs when coupled will get maximum emf for a voltaic cell?

The correct option is D Ca and CuAccording to the electrochemical series, the maximum modulus of difference in SRP of the metals occurs in the case of Ca and Cu.∴Ecell=SRPcathode−SRPanode is maximum when,Ecell=SRPCu−SRPCa[Note: Most and least reactive metal]Option D is correct.