Q.

Match the following columns. Given, EFe3+/Fe2+∘=0.77, E12I2/1−∘=+0.54E1/2Br2/Br−=1.09, EZn2+/Zn∘∘=−0.76

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A - p ; B - q ; C - p ; D - q,r

A - p,s ; B - q ; C - p,r,s ; D - p,s

A - p,r ; B - p,s ; C - p,r ; D - p,r,s

A - q ; B - r,s ; C - p,s ; D - p,q,r

answer is B.

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Detailed Solution

A→p,s; B→q; C→p,r,s; D→p,sA reaction is feasible, if its Ecello value is positive.A. Fe3+(aq)+I−(aq)⟶Fe2+(aq)+12I2(g) Ecell ∘=EFe3+/Fe2+−E∘1/2I2/1−=(0.77−0.54)=0.23 The reaction is feasible. i.e. ΔG∘=−veB. Fe3+(aq)+Br−(aq)⟶Fe2+(aq)+12Br2(g) Ecell ∘=EFe3+/Fe2+∘−E∘1/2Br2/Br−=0.77−1.09=−0.32V The reaction is not feasible. i.e. ΔG∘=+veC.12Br2(aq)+Fe2+(aq)⟶Br−(aq)+Fe3+(aq) Ecell ∘=E1/2Br2/Br−∘−EFe3+/Fe2+=1.09−0.77=0.32V The reaction is feasible. ΔG∘=−ve

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