If standard reduction potentials for Pb, K, Zn and Cu are -0.126 V, -2.925 V, -0.763 V and 0.337 V, the decreasing order of reducing power is
A. Zn > Pb > K > Cu
B. Cu > Pb > Zn > K
C. K > Zn > Pb > Cu
D. K > Pb > Cu > Zn
Answer:C
If standard reduction potentials for Pb, K, Zn and Cu are -0.126 V, -2.925 V, -0.763 V and 0.337 V, the decreasing order of reducing power is
A. Zn > Pb > K > Cu B. Cu > Pb > Zn > K C. K > Zn > Pb > Cu D. K > Pb > Cu > Zn