EoMg2+/Mg = -2.37 V EoZn2+/Zn = -0.76 V

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Target Exam

CUET

Subject

Chemistry

Chapter

Physical: Electro Chemistry

Question:

E^oMg²⁺/Mg = -2.37 V

E^oZn²⁺/Zn = -0.76 V

Which reaction is spontaneous?

(a) MgSO₄ + Zn → ZnSO₄ + Mg

(b) ZnSO₄ + Mg → MgSO₄ + Zn

Options:

Only a

Only b

Both a and b

None of these

Correct Answer:

Only b

Explanation:

E^o_Mg²⁺/Mg < E^o_Zn²⁺/Zn

So Mg lie above in electrochemical series. Mg can displace metal from zinc's salt solution which lies below it.

ZnSO₄ + Mg → MgSO₄ + Zn is spontaneous reaction.