Manipal MET2010ChemistryElectrochemistry
E^ values of Mg ²⁺ / Mg is -2.37 V , of Zn ²⁺ / Zn is -0.76 V and Fe ²⁺ / Fe is -0.44 V . Which of the statements is correct?
Options
- AZn will reduce Fe ²⁺
- BZn will reduce Mg ²⁺
- CMg oxidises Fe
- DZn oxidises Fe
Correct answer
A. Zn will reduce Fe ²⁺
Step-by-step solution
Higher the negative value of E^ , more is the reducing power. The order of E^ values (negative value) is - 2.37 ( Mg ) - 0.76 ( Zn ) - 0.44 ( Fe ) Mg can reduce both Zn ²⁺ and Fe ²⁺ . Zn can reduce Fe ²⁺ , but not Mg ²⁺ . Fe cannot reduce Mg and Zn but can oxidise them.