List of top Chemistry Questions on Electrochemistry asked in UP Board XII

Explain molar conductivity. The resistance of a cell filled with 0.02 mol L$^{-1$ KCl solution is 480 $\Omega$. Calculate the molar conductivity of the solution. (Cell constant = 1.29 cm$^{-1}$).}
Explain Kohlrausch Law. Limiting molar conductances (\( \lambda^0 \)) of \( \text{Ca}^{2+} \) and \( \text{Cl}^- \) ions in water at 298 K are 119.0 S cm\(^2\) mol\(^{-1}\) and 76.3 S cm\(^2\) mol\(^{-1}\) respectively. Calculate \( \lambda^0_m \) of \( \text{CaCl}_2 \).
Why do the conductivity of a solution decreases with dilution? Explain with reason.
The resistance of a column formed by a 0.10 mol L^{-1} concentrated solution is 6.5 × 10^3 ohm. Its diameter is 1 cm and length is 50 cm. Calculate its resistivity, conductivity and molar conductivity.
Calculate the electromotive force of the following cell: \[ \text{Cu} | \text{Cu}^{2+} (1M) || \text{Ag}^{+} (1M) | \text{Ag} \] Given \( E^\circ_{\text{Cu}^{2+}/\text{Cu}} = +0.34V \), \( E^\circ_{\text{Ag}^{+}/\text{Ag}} = +0.80V \)
Calculate the e.m.f. of the following cell: \[ \text{Mg(s)} | \text{Mg}^{2+} (0.1 M) || \text{Cu}^{2+} (0.001 M) | \text{Cu(s)} \] Given: \[ E^0_{\text{Cu}^{2+}/\text{Cu}} = +0.34V, \quad E^0_{\text{Mg}^{2+}/\text{Mg}} = -2.37V \]

What are fuel cells? State Two advantages of hydrogen-oxygen fuel cell over ordinary cell.

Explain the difference between an electrochemical cell and electrolytic cell. State Kohlrausch's law and write its applications.

The standard electrode potential of Daniel cell is 1.1 volt. Calculate the standard Gibbs energy for the following reaction: \[ \text{Zn}(s) + \text{Cu}^{2+}(aq) \rightarrow \text{Zn}^{2+}(aq) + \text{Cu}(s) \]
Explain molar conductivity. The resistance of a cell filled with \( 0.02 \, \text{mol L}^{-1} \) KCl solution is \( 480 \, \Omega \). Calculate the molar conductivity of the solution. (Cell constant = \( 29 \, \text{cm}^{-1} \)).
SI unit of \( \rho \) (rho) is:
After eliminating salt bridge of any Galvanic cell, voltage of the cell:
Is oxidation of bromide ion into bromine by ferric ion possible?
Write the difference between Galvanic cell and Electrolytic cell.
The column of a solution of 0.05 mol L$^{-1}$ NaOH has diameter 2.0 cm and length 100 cm. The resistance of the column of solution is 5.55 $\times$ 10$^3$ ohm. Calculate its resistivity, conductivity and molar conductivity.
At 298 K write Nernst equation for the following cell – Ni $\vert$ Ni$^{2+}$ (0.01 M) $\Vert$ Cu$^{2+}$ (0.1 M) $\vert$ Cu. If the emf of the above cell ($E_{cell}$) is 0.59 V then calculate the standard emf of the cell ($E^\circ_{cell}$)
Explain the following: (A) Conductance, (B) Cell constant.
Unit of specific conductance is:
Non-electrolyte is:
Explain Kohlrausch’s law of independent migration of ions. Mention one application of this law.
Write Nernst equation and its one application.
Calculate the standard e.m.f. of the following cell:
Zn $\mid$ Zn$^{2+}$ $\parallel$ Cu$^{2+}$ $\mid$ Cu
Given: $E^\circ_{(Zn^{2+}/Zn)} = -0.76 \, V$ and $E^\circ_{(Cu^{2+}/Cu)} = +0.34 \, V$
What is Kohlrausch’s law? Write its one application with example.
Unit of specific conductance is:
Write Nernst equation and its one application in chemical cells.