SATHEE: PYQ NEET- Electrochemistry L-1

Question: The standard electrode potential $(E^{\circ})$ values of ${Al}^{3 +} / Al, {Ag}^{+} / Ag, K^{+} / K$ and ${Cr}^{3 +} / Cr$ 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

A) $Ag > Cr > Al > K$

B) $K > Al > Cr > Ag$

C) $K > Al > Ag > Cr$

D) $Al > K > Ag > Cr$

Answer: $K > Al > Cr > Ag$

Sol:

Higher the value of $E_{red,}^{\circ}$ stronger is the oxidising power. Thus, the decreasing order of reducing power of the metal is $K > Al > Cr > Ag$ .

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Question: 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

Answer: K>Al>Cr>Ag

Sol:

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Question: The standard electrode potential $(E^{\circ})$ values of ${Al}^{3 +} / Al, {Ag}^{+} / Ag, K^{+} / K$ and ${Cr}^{3 +} / Cr$ 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

Answer: $K > Al > Cr > Ag$