Electro chemistry practice · Mixed difficulty

Which of the following is not correct?

Which of the following chemical reactions represents Hall-Heroult Process?

For which cell e.m.f. is independent of the concentrations of electrolytes used?

Limiting molar ionic conductivities of a uni-univalent electrolyte are 57 and 73. The limiting molar conductivity of the solution will be :

The standard electrode potential is measured by

Assertion (A) $E_{\text {cell }}$ increases with increase in concentration of $\mathrm{Ag}^{+}$ions.

Reason (R) $E_{\text {cell }}$ has positive value.

The equivalent conductivity of two strong electrolytes at infinite dilution are :
${\mathop \mathrm{\Lambda }\limits^ \circ _{\mathrm{C}{\mathrm{H}_3}\mathrm{COONa}\left( {\mathrm{aq}\mathrm{.}} \right)}} = 91.0{\kern 1pt} {\kern 1pt} {\kern 1pt} {\kern 1pt} {\rm{S {\kern 1pt} {\kern 1pt}c}}{\mathrm{m}^2}{\kern 1pt} {\kern 1pt} \mathrm{eq}{\mathrm{.}^{ - 1}}$
${\mathop \mathrm{\Lambda }\limits^ \circ _{\mathrm{HCl}\left( {\mathrm{aq}\mathrm{.}} \right)}} = 426.2{\kern 1pt} {\kern 1pt} {\kern 1pt} {\kern 1pt} {\rm{S {\kern 1pt} {\kern 1pt}c}}{\mathrm{m}^2}{\kern 1pt} {\kern 1pt} \mathrm{eq}{\mathrm{.}^{ - 1}}$
What additional information one needs to calculate $\mathop \mathrm{\Lambda }\limits^ \circ$ ̊ of an aqueous $\mathrm{C}{\mathrm{H}_3}\mathrm{COOH}?$

Which of the following aqueous solution will have the maximum specific conductance?

How much charge is present on 3 grams of $CO_3^{2 - }$ ions?

The standard e.m.f. of a galvanic cell can be calculated from :

Which of the following is the use of electrolysis?

Assertion : $E^{\circ}$ for ${Mn}^{3+} / {Mn}^{2+}$ is more positive than ${Cr}^3 / {Cr}^{2+}$.

Reason : The third ionization energy of ${Mn}$ is larger than that of ${Cr}$.

E.m.f. of cell $\mathrm{Ni}\left| {\mathrm{N}{\mathrm{i}^{2 + }}\left( {0.1M} \right)} \right|\left| {\mathrm{A}{\mathrm{u}^{3 + }}\left( {1.0M} \right)} \right|\mathrm{Au}{\kern 1pt} {\kern 1pt} is \ldots ..,$ if ${E^ \circ }$ for $\mathrm{N}{\mathrm{i}^{2 + }}|\mathrm{Ni}$ is $- 0.25\mathrm{V},{E^ \circ }$ for $\mathrm{A}{\mathrm{u}^{3 + }}|\mathrm{Au}$ is 1.50 V.

Assertion: On electrolysis of aq. $\mathrm{NaCl}, \mathrm{Na}$ is obtained.
Reason: $\mathrm{Na}^{+}$is reduced at cathode.

The products formed when an aqueous solution of ${NaBr}$ is electrolysed in a cell having inert electrodes are:

The best way to prevent rusting of iron is

Which process involves corrosion?

$\mathrm{O}_2$ gas will be evolved as a product of electrolysis of:

(A) an aqueous solution of $\mathrm{AgNO}_3$ using silver electrodes.

(B) an aqueous solution of $\mathrm{AgNO}_3$ using platinum electrodes.

(C) a dilute solution of $\mathrm{H}_2 \mathrm{SO}_4$ using platinum electrodes.

(D) a high concentration solution of $\mathrm{H}_2 \mathrm{SO}_4$ using platinum electrodes.

Choose the correct answer from the options given below:

It is not advisable to

Which is the correct relationship between equilibrium constant and standard reduction potential of cell?

For gold plating, the electrolyte used is

Which of the following reactions cannot be A base for electrochemical cell?

Galvanization is applying a coating of:

One mole of electrons passes through each of the solution of $AgN{O_3},\,CuS{O_4}$ and $AlC{l_3}$ when $Ag,Cu$ and $Al$ are deposited at cathode. The molar ratio of $Ag,Cu\,\,\mathrm{and}\,Al$ deposited are

If ${E}_{{Cu}^{2+} / {Cu}}^{\circ}=+0.34 \,{~V}$ then reduction potential of ${Cu}^{2+} / {Cu}$ electrode at ${pH}=14$ is $\left({K}_{{sp}}\right.$ of ${Cu}({OH})_2=1$ $\times 10^{-19}$ )

$E_{Cu}^ \circ = 0.34V,E_{Zn}^ \circ = 0.76V$ . A Daniel cell contains 0.1 M $\mathrm{ZnS}{\mathrm{O}_4}$ solution and 0.01 M $\mathrm{CuS}{\mathrm{O}_4}$ solution at its electrodes. EMF of the cell is

The equivalent conductivity of $\mathrm{KCl}$ at infinite dilution is 130 ${\rm{mho {\kern 1pt} {\kern 1pt}c}}{\mathrm{m}^2}{\kern 1pt} {\kern 1pt}\mathrm{e}{\mathrm{q}^{ - 1}}$. The transport number of $\mathrm{C}{\mathrm{l}^ - }$ ion in $\mathrm{KCl}$ at the same temperature is 0.505. The transport number of ${\mathrm{K}^ + }$ ion is :

The number of electrons transferred (lost or gained) during the reactions $Fe + {H_2}O \to F{e_3}{O_4} + {H_2}$

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: In equation $\Delta_r G=-n F E_{\text{cell}}$ value of $\Delta_r G$ depends on $n$.

Reasons R: $E_{\text {cell }}$ is an intensive property and $\Delta_r G$ is an extensive property.

In the light of the above statements, choose the correct answer from the options given below.

The cost of $2 \mathrm{~Rs} / \mathrm{~kWh}$ of operating an electric motor for 10 hours takes $10 \mathrm{~amp}$ at $110 \mathrm{~V}$ is :