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Standard XII

Chemistry

Standard Electrode Potentials

Consider a ty...

Question

Consider a typical volatic cell where $Z n (s)$ is placed in $Z n^{2 +} (a q)$ in one cell and $C u (s)$ is placed in $C u^{2 +} (a q)$ in the other.
For the voltaic cell represented above, which change will INCREASE the voltage?

Increasing the

[C u^{2 +}]

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Increasing the

[Z n^{2 +}]

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Increasing the size of the

C u

electrode.

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Increasing the size of the

Z n S

electrode.

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Solution

The correct option is D Increasing the size of the $Z n S$ electrode.
Zn is acting as an anode and on increasing the size of $Z n$ electrode, the oxidation will increase and number of electrons in solution also increase and this will increase the voltage.

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Similar questions

Q. Represent the galvanic cell in which the reaction takes place.

Z n (s) + {C u}^{2 +} (a q) \to {Z n}^{2 +} (a q) + C u (s)

E^{\circ}

for the electrochemical cell,

Z n (s) | Z n^{2 +} 1 M (a q .) ∥ C u^{2 +} 1 M (a q .) | C u (s)

1.10 V

25^{\circ} C

. The equilibrium constant for the cell reaction,

Z n (s) + C u^{2 +} (a q .) ⇌ Z n^{2 +} (a q .) + C u (s)

will be:

$E^{0}$ for the cell, $Z n | Z n {^{2 +}}_{(a q)} | | C u {^{2 +}}_{(a q)} | C u$ is $1.10 V$ at $25^{0} C$ . The equilibrium constant for $Z n + C u {^{2 +}}_{(a q)} \to Z n {^{2 +}}_{(a q)} + C u$ the cell reaction is of the order of :

Consider the cell:

Z n | Z n^{2 +} (a q) (1.0 M) | | C u^{2 +} (a q) (1.0 M) | | C u

The standard reduction potential are

0.350

V for

C u^{2 +} (a q) + 2 e^{-} \to C u

and

- 0.763

V for

Z n^{2 +} (a q) + 2 e^{-} \to Z n

The cell reaction is:

Q. A cell is represented by

Z n ∣ ∣ {Z n}^{2 +} (a q) ∣ ∣ ∣ ∣ {C u}^{2 +} (a q) ∣ ∣ C u

.
Given,

{C u}^{2 +} + {2 e}^{-} ⟶ C u, E^{\circ} = + 0.35 V

and

{Z n}^{2 +} + {2 e}^{-} ⟶ Z n, E^{\circ} = - 0.763 V

. Write the cell reactions, emf of the cell and state whether the cell reaction will be spontaneous or not?

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Consider a typical volatic cell where Zn(s) is placed in Zn2+(aq) in one cell and Cu(s) is placed in Cu2+(aq) in the other.For the voltaic cell represented above, which change will INCREASE the voltage?

The correct option is D Increasing the size of the ZnS electrode.Zn is acting as an anode and on increasing the size of Zn electrode, the oxidation will increase and number of electrons in solution also increase and this will increase the voltage.

Consider a typical volatic cell where $Z n (s)$ is placed in $Z n^{2 +} (a q)$ in one cell and $C u (s)$ is placed in $C u^{2 +} (a q)$ in the other.
For the voltaic cell represented above, which change will INCREASE the voltage?

The correct option is D Increasing the size of the $Z n S$ electrode.
Zn is acting as an anode and on increasing the size of $Z n$ electrode, the oxidation will increase and number of electrons in solution also increase and this will increase the voltage.