The standard potentials, at text25 texto textC, for the half- reactions are given against them below: Zn2++2e- xrightarrowZn Eo=-0.762 V Mg2++2e- xrightarrowMg Eo=-2.37 V When Zn dust is added to a solution of textMgC textl text2 text,

Question

The standard potentials, at text25 texto textC, for the half- reactions are given against them below: Zn2++2e- xrightarrowZn Eo=-0.762 V Mg2++2e- xrightarrowMg Eo=-2.37 V When Zn dust is added to a solution of textMgC textl text2 text,  (A) magnesium is precipitated (B) zinc dissolves in the solution (C) zinc chloride is formed (D) no reaction takes place

Tardigrade Admin · Accepted Answer

Since, the standard reduction potential of Zn is higher than that of Mg. So, it is placed after Mg in the electrochemical series. Therefore, it cannot replace Mg from textMgC textl text2 text.

Q. The standard potentials, at $25^{o} C,$ for the half- reactions are given against them below : $Z n^{2 +} + 2 e^{-} Z n$ $E^{o} = - 0.762 V$ $M g^{2 +} + 2 e^{-} M g$ $E^{o} = - 2.37 V$ When Zn dust is added to a solution of $MgC l_{2},$

magnesium is precipitated

zinc dissolves in the solution

zinc chloride is formed

no reaction takes place

Since, the standard reduction potential of Zn is higher than that of Mg. So, it is placed after Mg in the electrochemical series. Therefore, it cannot replace Mg from $MgC l_{2} .$

Q. The standard potentials, at 25oC, for the half- reactions are given against them below : Zn2++2e−​Zn Eo=−0.762V Mg2++2e−​Mg Eo=−2.37V When Zn dust is added to a solution of MgCl2​,