1.

Which of the following metals when coupled will give maximum e.m.f. for a voltaic cell ?

Answer»

FE and Cu
Ca and Cu
Cu and Au
Pb and Au

Solution :(a) Fe and Cu=0.34 -(-0.44)=0.18 V
(B) Ca and Cu =0.34-(-0.44)=0.18 V
(C)Cu and Au=1.42 -0.34 =1.08 V
(d) Pb and Au=1.42 -(-0.13)=1.55V


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