List of top Chemistry Questions on Electrochemistry asked in KCET

The resistance of 0.1 M weak acid HA in a conductivity cell is 2 × 10³ Ohm. The cell constant of the cell is 0.78 C m^-1 and \(\lambda_{m}^{\degree}\) of acid HA is 390 S cm² mol^-1. The pH of the solution is

Specific Conductance of 0.1 M HNO₃ is 6.3 x 10^-2 ohm ^-1 cm^-1. The molar conductance of the solution is

For spontaneity of a cell, which is correct ?

In fuel cell ___ are used as catalysts.

The molar conductivity is maximum for the solution of concentration

The resistance of 0.01 m KCl solution at 298 K is 1500Ω. If the conductivity of 0.01 m KCl solution at 298 K is 0.1466 × 10^-3 S cm^-1. The cell constant of the conductivity cell in cm^-1 is

\(H_{2(g)}+2AgCl_{(s)}⇌2Ag_{(s)}+2HCl_{(aq)}\)
\(E^{\degree}_{cell}\) at 25° C for the cell is 0.22 V. The equilibrium constant at 25° C is

Consider the following electrodes
P = Zn²⁺ (0.0001 M)/Zn  Q = Zn²⁺ (0.1 M)/Zn
R = Zn²⁺ (0.01 M)/Zn       S = Zn²⁺ (0.001 M)/Zn
E°Zn/Zn²⁺ = 0.76 V Electrode potentials of the above electrodes in volts are in the order

Give: E0Mn+7|Mn+2 = 1.5 V and E0Mn+4|Mn+2 = 1.2 V, then E0Mn+7|Mn+4 is

An aqueous solution of CuSO4 is subjected to electrolysis using inert electrodes. The pH of the solution will

At a particular temperature, the ratio of molar conductance to specific conductance of 0.01 M NaCl solution is

For a cell reaction involving two electron changes, ${E^{\circ}_{cell} = 0.3 \, V}$ at $ 25^{\circ} C$. The equilibrium constant of the reaction is

By passing electric current, \(NaClO_3\) is converted into \(NaClO_4\) according to the following equation \(Na ClO_3 + H_2 O \rightarrow NaClO_4 + H_2\) How many moles of \(NaClO_4\) will be formed when three Faradays of charge is passed through \(NaClO_3\) ?

Which of the following is incorrect in a galvanic cell ?

In $H_2 - O_2$ fuel cell the reaction occurring at cathode is

How many Coulombs of electricity are required for the oxidation of one mol of water to dioxygen ?

While charging the lead storage battery

For hydrogen - oxygen fuel cell at one $atm$ and $298\, K$ $H_2(g)+\frac {1}{2} O_2(g) \to H_2O_{(l)} ; \Delta G^\circ=-240\, kJ$ $E^\circ$ for the cell is approximately, (Given $F \,= \,96,500 \,C$)

For $Cr_2O_7^{-2} + 14H^{+} + 6e^{-} \to 2Cr^{+3} + 7H_2O; E $$^\circ$= $1.33 V At [Cr_2O_7 ^{-2}] = 4.5$ milli mole $[Cr^{+3}]=15$ milli mole, $E$ is $1.067\, V$.The pH of the solution is nearly equal to

Impure copper containing $Fe, Au, Ag$ as impurities is electrolytically refined. A current of $140\, A$ for $482.5 \,s$ decreased the mass of the anode by $22.26\, g$ and increased the mass of cathode by $22.011\, g$. Percentage of iron in impure copper is (Given molar mass $Fe = 55.5 \,g$ $mol^{-1}$, molar mass $Cu \,= \,63.54\, g \, mol^{-1}$)

In the electrolysis of acidulated water, it is desired to obtain $1.12\, cc$ of Hydrogen per second under $S.T.P.$ condition. The current to be passed is

Which of the following electrolytic solutions has the least specific conductance ?

When a quantity of electricity is passed through $CuSO_4$ solution, $0.16\, g$ of Copper gets deposited. If the same quantity of electricity is passed through acidulated water, then the volume of $H_2$ liberated at $STP$ will be [Given $At. Wt. Cu = 64$]

Which of the following does not conduct electricity ?