The standard reduction potential for `Fe^(2+) //Fe` and `Sn^(2+) //Sn` electrodes are `-0.44` and `-0.14 ` volt respectively. For the given cell reaction `Fe^(2+) + Sn rarr Fe + Sn^(2+) `, the standard ` EMF` is.A. ` +.030 V`B. `-0.58 V`C. ` +0. 58 V`D. ` -0. 30 V`

The standard reduction potential for `Fe^(2+) //Fe` and `Sn^(2+) //Sn`

1.	The standard reduction potential for `Fe^(2+) //Fe` and `Sn^(2+) //Sn` electrodes are `-0.44` and `-0.14 ` volt respectively. For the given cell reaction `Fe^(2+) + Sn rarr Fe + Sn^(2+) `, the standard ` EMF` is.A. ` +.030 V`B. `-0.58 V`C. ` +0. 58 V`D. ` -0. 30 V`
Answer» Correct Answer - D For the cell reaction. Fe acts as cathode and Sn as anode, Hence, `E_(cell)^2 -E_("cathode")^2 -E_("anode")^@ =- 0.44-(-0.14) =- 0.30 V` The negative EMF suggests that the reaction goes spontaneously in reversed direction.

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