Q.

The standard Potentials at 250 C for the half reactions are given against them below:Zn2++2e-→Zn;E0=-0.762V Mg2++2e-→Mg;E0=-2.37VWhen Zn dust is added to a solution of MgCl2

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a

Magnesium is precipitated

b

Zinc dissolves in the solution

c

Zinc chloride is formed

d

No reaction takes place

answer is D.

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Detailed Solution

Ezn+2/Zno>EMg+2/MgoSpontaneous reduction occurs at Zn electrode.Spontaneous oxidation occurs at Mg electrode.Cell reactionMg(s)+Zn(aq)+2→Mg(aq)+2+Zn(s)Zn cannot reduce Mg+2,hence no reaction occurs.
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