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Byju's Answer

Standard XII

Chemistry

Smelting

E ∘ for some ...

Question

$E^{\circ}$ for some half reaction given below:
Find out the pair between which redox reaction is not possible
$F e^{+ 3} / F e^{+ 2} = + 0.77, I_{2} / I^{-} = + 0.54 V C u^{+ 2} / C u = + 0.34, A g^{+} / A g = + 0.80 V$

$F e^{+ 3} a n d I^{-}$

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$A g^{+} a n d C u$

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$F e^{+ 3} a n d C u$

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$A g a n d F e^{+ 3}$

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Solution

The correct option is D
$A g a n d F e^{+ 3}$

$A g \to A g^{+} + e^{-} E^{\circ} = - 0.80 V F e^{+ 3} + e^{-} \to F e^{+ 2} E^{\circ} = + 0.77 V A g + F e^{+ 3} \to A g^{+} + F e^{+ 2} E^{\circ} = - 0.03 V$
This reaction is not feasible
Since $E_{c e l l}^{\circ} = - v e$ . So $Δ G^{\circ}$ will come out to be positive.

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Similar questions

Using the standard electrode potential, find out the pair between which redox reaction is not feasible.

$E ⊖$ values :

$\frac{F e^{3 +}}{F e^{2 +}} = + 0.77 \frac{I_{2}}{I^{-}} = + 0.54; \frac{C u^{2 +}}{C u} = + 0.34 \frac{A g^{+}}{A g} = + 0.80 V$

(a) $F e^{3 +}$ and $I^{-}$
(b) $A g^{+}$ and Cu
(c) $F e^{3 +}$ and Cu
(d) Ag and $F e^{3 +}$

Q. Using the standard electrode potential , find out the pair between which redox reaction is not feasible .

E^{0}

values :

F e^{3 +} / F e^{2 +}

= +0.77;

I_{2} / I^{-}

= + 0.54;

C u^{2 +} / C u

= +0.34;

A g^{+} / A g

= +0.80V

Q. Use

E^{\circ}

values to calculate

△ G^{\circ}

for the reaction

F e^{2 +} + A g^{+} \to F e^{3 +} + A g

E_{A g^{+} / A g}^{\circ} = 0.80 v o l t

and

E_{P t / F e^{3 +}, F e^{2 +}}^{\circ} = 0.77 v o l t

Q. At equimolar concentrations of

F e^{2 +}

and

F e^{3 +}

, what must

[A g^{+}]

be so that the voltage of the galvanic cell made from

A g^{+} / A g

and

F e^{3 +} / F e^{2 +}

electrodes equals zero? The reaction is

F e^{2 +} + A g^{+} ⇌ F e^{3 +} + A g

. Determine the equilibrium constant at

25^{\circ} C

for the reaction. (Given:

E_{A g^{+} / A g}^{\circ} = 0.799 v o l t

and

E_{F e^{3 +} / F e^{2 +}}^{\circ} = 0.771 v o l t

Using the standard electrode potentials given in the Table 8.1, predict if the reaction between the following is feasible:

(a) Fe³⁺(aq) and I^–(aq)

(b) Ag⁺(aq) and Cu(s)

(d) Ag(s) and Fe³⁺(aq)

(e) Br₂(aq) and Fe²⁺(aq)

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E∘ for some half reaction given below: Find out the pair between which redox reaction is not possible Fe+3/Fe+2=+0.77, I2/I−=+0.54VCu+2/Cu=+0.34, Ag+/Ag=+0.80V

The correct option is D Ag and Fe+3 Ag→Ag++e− E∘=−0.80VFe+3+e−→Fe+2 E∘=+0.77VAg+Fe+3→Ag++Fe+2 E∘=−0.03V This reaction is not feasible Since E∘cell=−ve. So ΔG∘ will come out to be positive.

$E^{\circ}$ for some half reaction given below:
Find out the pair between which redox reaction is not possible
$F e^{+ 3} / F e^{+ 2} = + 0.77, I_{2} / I^{-} = + 0.54 V C u^{+ 2} / C u = + 0.34, A g^{+} / A g = + 0.80 V$