Electrochemistry

During the electrolysis of acidified water, $16$ g of $\text{O}_2$ gas is formed at anode. The volume of $\text{H}_2$ gas liberated at cathode under STP conditions is

$\Lambda^0_{m(\text{NH}_4\text{OH})}$ is equal to ____

Given below are the half-cell reactions:$\text{Mn}^{2+} + 2e^- \rightarrow \text{Mn} \quad (E^0 = -1.18\text{ V})$$2(\text{Mn}^{3+} + e^- \rightarrow \text{Mn}^{2+}) \quad (E^0 = +1.51\text{ V})$The $E^0_{cell}$ for $3\text{Mn}^{2+} \righta...

The conductivity of centimolar solution of KCl at $298$ K is $0.021\text{ Ohm}^{-1}\text{cm}^{-1}$ and the resistance of the cell containing the solution at $298$ K is $60\,\Omega$. The value of cell constant ($G^*$) is __________.

Match the following select the correct option for the quantity of electricity, in $\mathrm{Cmol}^{-1}$ required to
deposit various metals at cathode
$$
\begin{array}{|l|l|l|l|}
\hline & \text { List - I } & & \text { List- II } \\
\hline \...

For a given half cell, $\mathrm{Al}^{3+}+3 \mathrm{e}^{-} \rightarrow \mathrm{Al}$ on increasing of aluminium ion, the electrode potential will

The electronic conductance depends on

The correct statement/s about Galvanic cell is/are
(a) Current flows from cathode to anode
(b) Anode is positive terminal
(c) If $\mathrm{E}_{\text {cell }}<0$, then it is spontaneous reaction
(d) Cathode is positive terminal

A current of 3 A is passed through a molten calcium salt for 1 hr 47 min 13 s . The mass of calcium deposited is
(Molar mass of $\mathrm{Ca}=40 \mathrm{~g} \mathrm{~mol}^{-1}$ )

The value of ' $A$ ' in the equation $\lambda_{\mathrm{m}}=\lambda_{\mathrm{m}}^{\circ}-A \sqrt{C}$ is same for the pair

How many coulombs are required to oxidise 0.1 mole of $\mathrm{H}_2 \mathrm{O}$ to oxygen?

Consider the following 4 electrodes
$$\begin{aligned}
& \mathrm{A}: \mathrm{Ag}^{+}(0.0001 \mathrm{M}) / \mathrm{Ag}(s) ; \\
& \mathrm{B}: \mathrm{Ag}^{+}(0.1 \mathrm{M}) / \mathrm{Ag}(s) ; \\
& \mathrm{C}: \mathrm{Ag}^{+}(0.01 \mathrm{M}) ...

During the electrolysis of brine, by using inert electrodes,

The resistance of \(0.1 \mathrm{~M}\) weak acid \(\mathrm{H} A\) in a conductivity cell is \(2 \times 10^3 \mathrm{~Ohm}\). The cell constant of the cell is \(0.78 ~\mathrm{C} \mathrm{~m}^{-1}\) and \(\lambda_{\mathrm{m}}^{\circ}\) of acid ...

Specific conductance of \(0.1 \mathrm{~M} \mathrm{~HNO}_3\) is \(6.3 \times 10^{-2} \mathrm{~ohm}^{-1} \mathrm{~cm}^{-1}\). The molar conductance of the solution is

For spontaneity of a cell, which is correct?

The molar conductivity is maximum for the solution of concentration

In fuel cells _______ are used as catalysts.

The resistance of \(0.01 \mathrm{~m} \mathrm{~KCl}\) solution at \(298 \mathrm{~K}\) is \(1500 \Omega\). If the conductivity of \(0.01 \mathrm{~m} \mathrm{~KCl}\) solution at \(298 \mathrm{~K}\) is $$0.1466 \times 10^{-3} \mathrm{~S} \mathr...

Consider the following electrodes
$$\begin{aligned}
& P=\mathrm{Zn}^{2+}(0.0001 \mathrm{M}) / \mathrm{Zn}, Q=\mathrm{Zn}^{2+}(0.1 \mathrm{M}) / \mathrm{Zn} \\
& R=\mathrm{Zn}^{2+}(0.01 \mathrm{M}) / \mathrm{Zn}, S=\mathrm{Zn}^{2+}(0.001 \ma...

\(\mathrm{H}_2(g)+2 \mathrm{AgCl}(s) \rightleftharpoons 2 \mathrm{Ag}(s)+2 \mathrm{HCl}(a q)\)
\(E_{\text {cell }}^{\circ}\) at \(25^{\circ} \mathrm{C}\) for the cell is \(0.22 \mathrm{~V}\). The equilibrium constant at $$25^{\circ} \mathrm...

The pair of electrolytes that posses same value for the constant \((A)\) in the Debye-Huckel-Onsager equation, \(\Lambda_m=\Lambda_m^{\circ}-A \sqrt{C}\) is

Given \(E_{F{e^{3 + }}/F{e^{2 + }}}^o = + 0.76\,V\) and \(E_{\mathrm{I}_2 / \mathrm{I}^{-}}^0=+0.55 \mathrm{~V}\). The equilibrium constant for the reaction taking place in galvanic cell consisting of above two electrodes is $$\left[\frac{...

If an aqueous solution of \(\mathrm{NaF}\) is electrolysed between inert electrodes, the product obtained at anode is

Addition of excess of \(\mathrm{AgNO}_3\) to an aqueous solution of 1 mole of \(\mathrm{PdCl}_2 \cdot 4 \mathrm{NH}_3\) gives 2 moles of \(\mathrm{AgCl}\). The conductivity of this solution corresponds to

Give \(E_{\mathrm{Mn}^{+7} \mid \mathrm{Mn}^{+2}}^0=1.5 \mathrm{~V}\) and \(E_{\mathrm{Mn}^{+4}\mid \mathrm{Mn}^{+2}}^0=1.2 \mathrm{~V}\), then \(E_{\mathrm{Mn}^{+7} \mid \mathrm{Mn}^{+4}}^0\) is

An aqueous solution of \(\mathrm{CuSO}_4\) is subjected to electrolysis using inert electrodes. The \(\mathrm{pH}\) of the solution will

One litre solution of \(\mathrm{MgCl}_2\) is electrolysed completely by passing a current of \(1 \mathrm{~A}\) for \(16 \mathrm{~min} 5 \mathrm{~sec}\). The original concentration of \(\mathrm{MgCl}_2\) solution was
(Atomic mass of $$\math...

The charge required for the reduction of $1 \mathrm{~mol}$ of $ \mathrm{MnO}_4^{-}$to $\mathrm{MnO}_2$ is

For a cell involving two electron changes, $E_{\text {cell }}^{\circ}=03 \mathrm{~V}$ at $25^{\circ} \mathrm{C}$. The equilibrium constant of the reaction is

Which of the following is not a conductor of electricity?

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

In the electrolysis of aqueous sodium chloride solution, which of the half cell reaction will occur at anode?

By passing electric current, $\mathrm{NaClO}_3$ is converted in to $\mathrm{NaClO}_4$ according to the following equation
\(\mathrm{NaClO}_3+\mathrm{H}_2 \mathrm{O} \longrightarrow \mathrm{NaClO}_4+\mathrm{H}_2\)
How many moles of $\mathr...

The standard reduction potential at 298 K for the following half cell reaction
$$ \begin{aligned} & 2 \mathrm{n}^{2+}(a q)+2 e^{-} \rightarrow \mathrm{Zn}(s) ; E^0=-0.762 \mathrm{~V} \\ & \mathrm{Cr}^{3+}(a q)+3 e^{-} \rightarrow \mathrm{Cr...