You visited us 1 times! Enjoying our articles? Unlock Full Access!

Application of Electrolysis

The standard ...

Question

The standard reduction potential of Pb and Zn electrodes are -0.126 and -0.763 volts respectively. The e.m.f. of the cell
$Z n | {Z n}^{2 +} (0.1 M) ∥ {P b}^{2 +} (1 M) | P b$ is:

0.637V

No worries! We‘ve got your back. Try BYJU‘S free classes today!

< 0.637 V

No worries! We‘ve got your back. Try BYJU‘S free classes today!

> 0.637 V

No worries! We‘ve got your back. Try BYJU‘S free classes today!

0.889V

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct option is D 0.889V
We know that $E_{c e l l}$ is given by the equation,
$E_{c e l l} = E_{c e l l}^{0} - \frac{0.059}{n} l o g (K)$
Here for the given reaction,
$Z n + P b^{2 +} \to Z n^{2 +} + P b$
n=2 for this reaction.
$[Z n^{2 +}] = 0.1 M$ and $[P b^{2 +}] = 1 M$
$E_{c e l l}^{0} = E_{c a t h o d e} - E_{a n o d e} = 0.126 - (- 0.763) = 0.889 V$
Hence,
$E_{c e l l} = 0.889 - \frac{0.059}{2} l o g \frac{0.1}{1} = 0.889 V$
Hence,option D is correct answer.

Suggest Corrections

Similar questions

The standard reduction potential of Pb and Zn electrodes are – 0.126 and -0.763 volts respectively. The e.m.f of the cell
$Z n | Z n^{2 +} (0.1 M) | | P b^{2 +} (1 M) | P b$ is

Q. Standard reduction potentials of

S n^{2 +} | S n

and

Z n^{2 +} | Z n

electrodes are 0.14V and 0.74 V respectively. What is the

E^{\circ}

of the cell

Z n | Z n^{2 +} | | S n^{2 +} | S n

in volt?

Q. The standard electrode potentials of

Z n^{2 +} | Z n

and

A g^{+}

| Ag are -0.763 V and +0.799 V respectively. The standard potential of the cell is

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:

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

Assertion: The reaction is spontaneous.

Reason: The cell potential is positive.

Join BYJU'S Learning Program

The standard reduction potential of Pb and Zn electrodes are -0.126 and -0.763 volts respectively. The e.m.f. of the cellZn|Zn2+(0.1M)∥Pb2+(1M)|Pb is:

The standard reduction potential of Pb and Zn electrodes are -0.126 and -0.763 volts respectively. The e.m.f. of the cell
$Z n | {Z n}^{2 +} (0.1 M) ∥ {P b}^{2 +} (1 M) | P b$ is: