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Standard XII

Physics

Electric Potential at a Point in Space Due to a Point Charge Q

Deducted from...

Question

Deducted from the following $E^{o}$ values of half cells, what combination of two half cells would result in a cell with the largest potential?
(i) $A^{3 -} \to A^{2 -} + e; E^{o} = 1.5 V$
(ii) $B^{2 +} + e \to B^{+}; E^{o} = 2.1 V$
(iii) $C^{2 +} + e \to C^{+}; E^{o} = + 0.5 V$
(iv) $D \to D^{2 +} + 2 e; E^{o} = - 1.5 V$

(i) and (iii)

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(i) and (ii)

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(ii) and (iv)

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(iii) and (iv)

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Solution

The correct option is D (i) and (ii)
$A^{3 -} \to A^{2 -} + e$ $E^{o} = 1.5$
$B^{2 +} + e \to B^{+}$ $E^{o} = 2.1$
$C^{2 +} + e \to C^{+}$ $E^{o} = 0.5$
$D \to D^{2 +} + 2 e$ $E^{o} = - 1.5$
$1$ & $3 \Rightarrow E_{o} = 1.5 + 0.5 = 2 V$
$1$ & $2 \Rightarrow E_{o} = | 1.5 + 2.1 | = 3.6 V$
$2$ & $4 \Rightarrow E_{o} = (2.1 - \frac{1.5}{2}) = 1.35 V$
$3$ & $4 \Rightarrow E_{o} = 0.5 - 1.5 = - 1 V$

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Similar questions

Half cell reactions for some electrodes are given below:

A + e^{-} ⟶ A^{-}; E^{0} = 0.96 V

II.

B^{-} + e^{-} ⟶ B^{2 -}; E^{o} = - 0.12 V

III.

C^{+} + e^{-} ⟶ C; E^{o} = + 0.18 V

IV.

D^{2 +} + {2 e}^{-} ⟶ D; E^{o} = - 1.12 V

The largest potential will be generated in which cell?

Q. If for the half-cell reactions

{C u}^{2 +} + e^{-} ⟶ C u^{+} E^{o} = 0.15 V

{C u}^{2 +} + 2 e^{-} ⟶ C u E^{o} = 0.34 V

Calculate

E^{o}

of the half cell reaction

{C u}^{+} + e^{-} ⟶ C u

Also predict whether

{C u}^{+}

undergoes disproportionation or not.

Deduce from the following $E^{⊖}$ values of half cells, what combination of two half cells would results in a cell with the largest potential ?

I. $A + e^{-} \to A^{⊖}, E^{⊖} = - 0.24 V$

II. $B^{⊖} + e^{-} \to B^{2 -}, E^{⊖} = + 1.25 V$

III. $C^{⊖} + 2 e^{-} \to C^{3 -}; E^{⊖} = - 1.25 V$

IV.

A + 2 e^{-} \to D^{2 -}; E^{⊖} = + 0.68 V

Deduced from the following $E^{\circ}$ values of half cells, what combination of two half cells would result in a cell with the largest potential?
(i) $A^{3 -} \to A^{2 -} + e; E^{\circ} = 1.5 V$ (ii) $B^{2 +} + e \to B^{+}; E^{\circ} = 2.1 V$
(iii) $C^{2 +} + e \to C^{+}; E^{\circ} = + 0.5 V$ (iv) $D \to D^{2 +} + 2 e; E^{\circ} = - 1.5 V$

E^{o}

values for the half cell reactions are given:

C u^{2 +} + e^{-} \to C u^{+}

;

E^{o} = 0.15

C u^{2 +} + 2 e^{-} \to C u

;

E^{o} = 0.34

V
What will be the

E^{o}

of the half-cell:

C u^{+} + e^{-} \to C u

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Deducted from the following Eo values of half cells, what combination of two half cells would result in a cell with the largest potential?(i) A3−→A2−+e;Eo=1.5V(ii) B2++e→B+;Eo=2.1V(iii) C2++e→C+;Eo=+0.5V(iv) D→D2++2e;Eo=−1.5V

The correct option is D (i) and (ii)A3−→A2−+e Eo=1.5B2++e→B+ Eo=2.1C2++e→C+ Eo=0.5D→D2++2e Eo=−1.51 & 3⇒Eo=1.5+0.5=2V1 & 2⇒Eo=|1.5+2.1|=3.6 V2 & 4⇒Eo=(2.1−1.52)=1.35 V3 & 4⇒Eo=0.5−1.5=−1 V