Q.

The standard electrode potential E⊖values of Al3+/Al,Ag+/Ag,K+/K and Cr3+/Cr are –1.66 V, 0.80 V, –2.93 V and –0.74 V, respectively. The correct decreasing order of reducing power of the metal is

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a

Al > K > Ag > Cr

b

Ag > Cr > Al > K

c

K > Al > Cr > Ag

d

K > Al > Ag > Cr

answer is C.

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Detailed Solution

Lesser is the reduction potential greater is the reducing power.Reduction Potential : Ag+/Ag>Cr3+/Cr>Al3+/Al>K+/KReducing Power : K > Al > Cr > Ag
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The standard electrode potential E⊖values of Al3+/Al,Ag+/Ag,K+/K and Cr3+/Cr are –1.66 V, 0.80 V, –2.93 V and –0.74 V, respectively. The correct decreasing order of reducing power of the metal is