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Standard XII

Chemistry

EMF

The standard ...

Question

The standard electrode potential $E_{l_{2} / r}^{o}, E_{{B r}^{-} / {B r}_{2}}^{0} a n d E_{F e / {F e}^{2 +}}^{0}$ are respectively +0.54V,-1.09V and 0.44V. On the basis of above data which of the following process is non spontaneous?

{B r}_{2} + {2 I}^{1} ⟶ 2 B r + I_{2}

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F e + {B r}_{2} ⟶ {F e}^{2 +} + 2 B r

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F e + I_{2} ⟶ {F e}^{2 +} + {2 I}^{-}

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I_{2} + B r ⟶ {2 I}^{-} + {B r}_{2}

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Solution

The correct option is C ${B r}_{2} + {2 I}^{1} ⟶ 2 B r + I_{2}$
We know that,
$Δ G = - n F E_{c e l l}$ , if $Δ G > 0$ the, the reaction is said to be spontaneous.For that, $E_{c e l l} > 0$
In the given options considering option A,
$E_{c e l l} = E_{c a t h o d e} - E_{a n o d e} = - 0.54 - 1.09 = - 1.63 V$
So the value of $E_{c e l l} > 0$ and hence the reaction will be non-spontaneous.
Hence,option A is correct answer.

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Similar questions

Q. For

I_{2} + 2 e^{-} \to 2 I^{-}, standard reduction potential = + 0.54 Volt .

For

2 B r^{-} \to B r_{2} + 2 e^{-}, standard oxidation potential = - 1.09 Volt .

For

F e \to F e^{2 +} + 2 e^{-}, standard oxidation potential = + 0.44 Volt .

Out of the below given reactions, how many reactions are spontaneous in nature (predict from the above data) ?

B r_{2} + 2 I^{-} \to 2 B r^{-} + I_{2}

F e + B r_{2} \to F e^{2 +} + 2 B r^{-}

F e + I_{2} \to F e^{2 +} + 2 I^{-}

I_{2} + 2 B r^{-} \to 2 I^{-} + B r_{2}

Q. For

I_{2} + 2 e^{-} \to 2 I^{-} standard reduction potential = + 0.54 Volt .

For

2 B r^{-} \to B r_{2} + 2 e^{-} standard oxidation potential = - 1.09 Volt .

For

F e \to F e^{2 +} + 2 e^{-}, standard oxidation potential = + 0.44 Volt .

Which of the following reaction(s) is/are spontaneous:

Q. For

I_{2} + 2 e^{-} \to 2 I^{-}, standard reduction potential = + 0.54 Volt .

For

2 B r^{-} \to B r_{2} + 2 e^{-}, standard oxidation potential = - 1.09 Volt .

For

F e \to F e^{2 +} + 2 e^{-}, standard oxidation potential = + 0.44 Volt .

Out of the below given reactions, how many reactions are spontaneous in nature (predict from the above data) ?

B r_{2} + 2 I^{-} \to 2 B r^{-} + I_{2}

F e + B r_{2} \to F e^{2 +} + 2 B r^{-}

F e + I_{2} \to F e^{2 +} + 2 I^{-}

I_{2} + 2 B r^{-} \to 2 I^{-} + B r_{2}

Q. The standard electrode potentials

E_{I_{2} / I^{-}}^{\circ}, E_{B r^{-} / B r_{2}}^{\circ} and E_{F e / F e^{2 +}}^{\circ}

are respectively

+ 0.54 V

- 1.09 V

and

0.44 V

On the basis of the above data which of the following process is nonspontaneous?

Given that : $I_{2} + 2 e^{-} \to 2 I^{-}; E_{I_{2} / I^{-}}^{o}$ = 0.54V; $B r_{2} + 2 e^{-} \to 2 B r^{-}; E_{B r_{2} / B r^{-}}^{o}$ = 1.69V. Predict which of the following is true:

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The standard electrode potential Eol2/r,E0Br−/Br2andE0Fe/Fe2+ are respectively +0.54V,-1.09V and 0.44V. On the basis of above data which of the following process is non spontaneous?

The standard electrode potential $E_{l_{2} / r}^{o}, E_{{B r}^{-} / {B r}_{2}}^{0} a n d E_{F e / {F e}^{2 +}}^{0}$ are respectively +0.54V,-1.09V and 0.44V. On the basis of above data which of the following process is non spontaneous?