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Home Questions DEBZJXDAUJ
Target Exam

CUET

Subject

Chemistry

Chapter

Physical: Electro Chemistry

Question:

Given that the standard electrode potentials (E°) of metals are :
K+/K = -2.93 V, Ag+/Ag = 0.80 V, Cu2+/Cu = 0.34 V,
Mg2+/Mg = -2.37 V, Cr3+/Cr = -0.74 V, Fe2+/Fe = -0.44 V.
What is the increasing order of their reducing power? 

Options:

Ag+/Ag > Cu2+/Cu > Fe2+/Fe > Cr3+/Cr > Mg2+/ Mg > K+/K

Ag+/Ag < Cu2+/Cu < Fe2+/Fe < Cr3+/Cr < Mg2+/ Mg < K+/K

Ag+/Ag < Fe2+/Fe < Cr3+/Cr < Mg2+/ Mg < K+/K < Cu2+/Cu

Fe2+/Fe < Cr3+/Cr < Mg2+/ Mg < K+/K < Cu2+/Cu < Ag+/Ag 

Correct Answer:

Ag+/Ag < Cu2+/Cu < Fe2+/Fe < Cr3+/Cr < Mg2+/ Mg < K+/K

Explanation:

More negative the value of standard electrode potentials of metals is, more will be the reducing power.

 

 

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