Electrochemistry PYQs - Last 5 Years
AP EAPCET / Chemistry / Physical Chemistry / 36 recent questions
ChemistryPhysical Chemistry2021-2025
Practice 36 AP EAPCET Chemistry questions from Electrochemistry. Use the year-wise and type-wise breakdown to prioritize recent PYQs, then continue into the question list below.
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Last 5 Years Electrochemistry Questions
Showing 36 of 36 filtered questions.
1Electrochemistry
Observe the following statements about dry cell
I. It is a primary battery.
II. Zinc vessel acts as cathode.
III. A paste of moist $\mathrm{NH}_4 \mathrm{Cl}, \mathrm{MnO}_2$ and $\mathrm{ZnCl}_2$, is present between two electrodes
IV. The ...
I. It is a primary battery.
II. Zinc vessel acts as cathode.
III. A paste of moist $\mathrm{NH}_4 \mathrm{Cl}, \mathrm{MnO}_2$ and $\mathrm{ZnCl}_2$, is present between two electrodes
IV. The ...
MCQ+1 / -02025
2Electrochemistry
In a cell a copper electrode was used as a cathode. What is the electrode potential (in V) of the copper electrode dipped in $0.1 \mathrm{M} \mathrm{Cu}^{2+}$ solution at 298 K ?
$$ \left(E_{\mathrm{Cu}^{2+} / \mathrm{Cu}}^{\ominus}=0.34 \m...
$$ \left(E_{\mathrm{Cu}^{2+} / \mathrm{Cu}}^{\ominus}=0.34 \m...
MCQ+1 / -02025
3Electrochemistry
\(\text { Match the following }\)
$$ \begin{array}{llll} \hline & \begin{array}{l} \text { List-I (Symbol of } \\ \text { electrical property) } \end{array} & & \text { List-I (Units) } \\ \hline \text { (A) } & \Lambda_{\mathrm{m}} & \te...
$$ \begin{array}{llll} \hline & \begin{array}{l} \text { List-I (Symbol of } \\ \text { electrical property) } \end{array} & & \text { List-I (Units) } \\ \hline \text { (A) } & \Lambda_{\mathrm{m}} & \te...
MCQ+1 / -02025
4Electrochemistry
Consider the following cell reaction
\(2 \mathrm{Fe}^{3+}(a q)+2 \mathrm{I}^{-}(a q) \rightleftharpoons 2 \mathrm{Fe}^{2+}(a q)+\mathrm{I}_2(s)\)
At 298 K , the cell emf is 0.237 V . The equilibrium constant for the reaction is $10^x$. Th...
\(2 \mathrm{Fe}^{3+}(a q)+2 \mathrm{I}^{-}(a q) \rightleftharpoons 2 \mathrm{Fe}^{2+}(a q)+\mathrm{I}_2(s)\)
At 298 K , the cell emf is 0.237 V . The equilibrium constant for the reaction is $10^x$. Th...
MCQ+1 / -02025
5Electrochemistry
At 298 K , the following reaction takes place for a cell at the hydrogen electrode
\(\mathrm{H}^{+}(a q)+e^{-} \longrightarrow \frac{1}{2} \mathrm{H}_2 \text { (1 bar) }\)
The solution pH is 10.0 . What is the hydrogen electrode potential...
\(\mathrm{H}^{+}(a q)+e^{-} \longrightarrow \frac{1}{2} \mathrm{H}_2 \text { (1 bar) }\)
The solution pH is 10.0 . What is the hydrogen electrode potential...
MCQ+1 / -02025
6Electrochemistry
\(\text { Match the following }\)
$$ \begin{array}{cccc} \hline & \begin{array}{c} \text { List-I } \\ \text { (Transition metal, M) } \end{array} & & \begin{array}{c} \text { List-II } \\ \left(E_{M^{2+} / M}^{\ominus}\right) \end{array}...
$$ \begin{array}{cccc} \hline & \begin{array}{c} \text { List-I } \\ \text { (Transition metal, M) } \end{array} & & \begin{array}{c} \text { List-II } \\ \left(E_{M^{2+} / M}^{\ominus}\right) \end{array}...
MCQ+1 / -02025
7Electrochemistry
When the lead storage battery is in use (during discharge) the reaction that occurs at the anode is
MCQ+1 / -02025
8Electrochemistry
If $E_{\mathrm{Fe}^{2+} / \mathrm{Fe}}^{\circ}=-0.441 \mathrm{~V}$ and $E_{\mathrm{Fe}^{3+} / \mathrm{Fe}^{2+}}^{\circ}=0.771 \mathrm{~V}$, the standard emf of the cell reaction $\mathrm{Fe}(s)+2 \mathrm{Fe}^{3+}(a q) \longrightarrow 3 \mat...
MCQ+1 / -02025
9Electrochemistry
For which of the following the $E^{\ominus}\left(M^{3+} / M^{2+}\right)$ is negative?
MCQ+1 / -02025
10Electrochemistry
The resistance of a conductivity cell filled with 0.1 M KCl solution is $100 \Omega$. If the resistance of the same cell when filled with 0.2 M KCl solution is $520 \Omega$, the molar conductivity of 0.02 M solution (in $\mathrm{S} \mathrm{...
MCQ+1 / -02025
11Electrochemistry
The specific conductance of 0.05 M NaOH solution is $0.0115 \mathrm{~S} \mathrm{~cm}^{-1}$ What is its molar conductance ( $\wedge_{\mathrm{m}}$ ) in $\mathrm{Scm}^2 \mathrm{~mol}^{-1}$ ?
MCQ+1 / -02025
12Electrochemistry
What is $E_{\text {cell }}$ (in V) of the following cell at $298 \mathrm{~K} ?$
$$ \begin{aligned} & \left(E_{\mathrm{Zn}^{2+} / \mathrm{Zn}}^{\ominus}=-0.76 \mathrm{~V} ; E_{\mathrm{Ni}^{2+} / \mathrm{Ni}}^{\ominus}=-0.25 \mathrm{~V} ; \fr...
$$ \begin{aligned} & \left(E_{\mathrm{Zn}^{2+} / \mathrm{Zn}}^{\ominus}=-0.76 \mathrm{~V} ; E_{\mathrm{Ni}^{2+} / \mathrm{Ni}}^{\ominus}=-0.25 \mathrm{~V} ; \fr...
MCQ+1 / -02025
13Electrochemistry
At 300 K , the $E_{\text {cell }}^{\ominus}$ of
\(A(s)+B^{2+}(a q) \rightleftharpoons A^{2+}(a q)+B(s)\)
is 1.0 V . If $\Delta_r S^\theta$ of this reaction is $100 \mathrm{JK}^{-1}$. What is $\Delta_r H^{\ominus}$ (in $\mathrm{kJ} \mathrm...
\(A(s)+B^{2+}(a q) \rightleftharpoons A^{2+}(a q)+B(s)\)
is 1.0 V . If $\Delta_r S^\theta$ of this reaction is $100 \mathrm{JK}^{-1}$. What is $\Delta_r H^{\ominus}$ (in $\mathrm{kJ} \mathrm...
MCQ+1 / -02024
14Electrochemistry
In which of the following Galvanic cells emf is maximum?
(Given, $E_{\mathrm{Mg}^{2+} \mid \mathrm{Mg}}^{\circ}=-2.36 \mathrm{~V}$
and $E_{\mathrm{Cl}_2 \mid 2 \mathrm{Cl}^{-}}^{\circ}=+136 \mathrm{~V}$ )
MCQ+1 / -02024
15Electrochemistry
Consider the cell reaction at 300 K .
\(A(s)+B^{2+}(a q) \rightleftharpoons A^{2+}(a q)+B(s)\)
Its $E^{\ominus}$ is 1.0 V . The $\Delta_r H^{\ominus}$ of the reaction is $-163 \mathrm{kJmol}^{-1}$.
What is $\Delta_r s^{\ominus}$ (in $\mat...
\(A(s)+B^{2+}(a q) \rightleftharpoons A^{2+}(a q)+B(s)\)
Its $E^{\ominus}$ is 1.0 V . The $\Delta_r H^{\ominus}$ of the reaction is $-163 \mathrm{kJmol}^{-1}$.
What is $\Delta_r s^{\ominus}$ (in $\mat...
MCQ+1 / -02024
16Electrochemistry
As per standard reduction potential values, which is the strongest reducing agent among the given elements?
MCQ+1 / -02024
17Electrochemistry
The standard reduction potentials of $2 \mathrm{H}^{+} / \mathrm{H}_2, \mathrm{Cu}^{2+} / \mathrm{Cu}, \mathrm{Zn}^{2+} / \mathrm{Zn}$ and $\mathrm{NO}_3^{-}, \mathrm{H}^{-} / \mathrm{NO}$ are 0.0 0.34 . -0.76 and 0.97 V respectively. Ident...
MCQ+1 / -02024
18Electrochemistry
Consider the following standard electrode potentials ( $E^{\circ}$ in volts) in aqueous solution.
$$ \begin{array}{|c|c|c|} \hline \text { Element } & M^{3+} / M & M^{+} / M \\ \hline \mathrm{Al} & -1.66 & +0.55 \\ \hline \mathrm{TI} & +1.2...
$$ \begin{array}{|c|c|c|} \hline \text { Element } & M^{3+} / M & M^{+} / M \\ \hline \mathrm{Al} & -1.66 & +0.55 \\ \hline \mathrm{TI} & +1.2...
MCQ+1 / -02024
19Electrochemistry
Aqueous $\mathrm{CuSO}_4$ solution was electrolysed by passing 2 amp of current for 10 min . What is the weight (in g) of copper deposited at cathode ?
\(\left(\mathrm{Cu}=63 \mathrm{u} ; F=96500 \mathrm{C} \mathrm{~mol}^{-1}\right)\)
\(\left(\mathrm{Cu}=63 \mathrm{u} ; F=96500 \mathrm{C} \mathrm{~mol}^{-1}\right)\)
MCQ+1 / -02024
20Electrochemistry
The standard reduction potentials of $2 \mathrm{H}^{+} / \mathrm{H}_2, \mathrm{Cu}^{2+} / \mathrm{Cu}, \mathrm{Zn}^{2+} / \mathrm{Zn}$ and $\mathrm{NO}_3^{-}, \mathrm{H}^{-} / \mathrm{NO}$ are 0.0 , +0.34 . -0.76 and 0.97 V respectively. Ob...
MCQ+1 / -02024
21Electrochemistry
The anode and cathode used in electrolytic refining of copper respectively are
MCQ+1 / -02024
22Electrochemistry
2.644 g of metal $(M)$ was deposited when 8040 coulombs of electricity was passed through molten $M \mathrm{~F}_2$ salt. What is the atomic mass of M?
\(\left(\mathrm{F}=96500 \mathrm{C} \mathrm{~mol}^{-1}\right)\)
\(\left(\mathrm{F}=96500 \mathrm{C} \mathrm{~mol}^{-1}\right)\)
MCQ+1 / -02024
23Electrochemistry
The $E^{-}$of $M\left|M^{2+} \| \mathrm{Cu}^{2+}\right| \mathrm{Cu}$ is 0.3 V .At what concentration of $\mathrm{Cu}^{2+}\left(\mathrm{in} \mathrm{mol} \mathrm{L} \mathrm{L}^{-1}\right)$, the $\mathrm{E}_{\mathrm{cel}}$ value becomes zero ?...
MCQ+1 / -02024
24Electrochemistry
The conductivity of a solution containing 2.08 g of anhydrous barium chloride in 200 mL solution is $6 \times 10^{-3} \mathrm{ohm}^{-1} \mathrm{~cm}^{-1}$. The molar conductivity of the solution (in $\mathrm{ohm}^{-1} \mathrm{~cm}^2 \mathrm...
MCQ+1 / -02023
25Electrochemistry
The number of Faradays required to completely deposit magnesium from 1 L of $0.1 \mathrm{M} \mathrm{MgCl}_2$ aqueous solution is
MCQ+1 / -02023
26Electrochemistry
96.5 amperes current is passed through the molten \(\mathrm{AlCl}_3\) for 100 seconds. The mass of aluminium deposited at the cathode is (atomic weight of \(\mathrm{Al}=27 \mathrm{u}\))
MCQ+1 / -02022
27Electrochemistry
The reduction potential of hydrogen electrode at \(25^{\circ} \mathrm{C}\) in a neutral solution is (\(p_{\mathrm{H}_2}=1\) bar)
MCQ+1 / -02022
28Electrochemistry
38.6 amperes of current is passed for 100 seconds through an aqueous \(\mathrm{CuSO}_4\) solution using platinum electrodes. The mass of copper consumed from the solution and volume of gas liberated at STP are respectively (molar mass of $$...
MCQ+1 / -02022
29Electrochemistry
If hydrogen electrons dipped in two solutions
of pH = 3 and pH = 6 are connected by a salt
bridge, the emf of the resulting cell is
of pH = 3 and pH = 6 are connected by a salt
bridge, the emf of the resulting cell is
MCQ+1 / -02021
30Electrochemistry
In the electrolysis of a CuSO\(_4\) solution, how
many grames of Cu are plated out on the
cathode, in the time that is required to
liberate 5.6 L of O\(_2\)(g), measured at 1 atm and
273 K, at the anode?
many grames of Cu are plated out on the
cathode, in the time that is required to
liberate 5.6 L of O\(_2\)(g), measured at 1 atm and
273 K, at the anode?
MCQ+1 / -02021
31Electrochemistry
The molar conductivities \(\left(\lambda_{\mathrm{m}}^{\Upsilon}\right)\) at infinite dilution of \(\mathrm{KBr}, \mathrm{HBr}\) and \(\mathrm{KNH}_2\) are 120.5, 420.6 and \(90.48 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}\) respectivel...
MCQ+1 / -02021
32Electrochemistry
When a current of 10 A is passes through
molten AlCl\(_3\) for 1.608 minutes. The mass of
Al deposited will be
[Atomic mass of Al = 27 g]
molten AlCl\(_3\) for 1.608 minutes. The mass of
Al deposited will be
[Atomic mass of Al = 27 g]
MCQ+1 / -02021
33Electrochemistry
Assertion (A) Sodium acetate on Kolbe’s
electrolysis gives ethane.
Reason (R) Methyl free radical is formed at
cathode.
electrolysis gives ethane.
Reason (R) Methyl free radical is formed at
cathode.
MCQ+1 / -02021
34Electrochemistry
For \(\mathrm{C{r_2}O_7^{2 - } + 14{H^ + } + 6{e^ - }\buildrel {Yields} \over
\longrightarrow 2C{r^{3 + }} + 7{H_2}O,{E^\Upsilon } = 1.33}\) V at \([C{r_2}O_7^{2 - }] = 4.5\) millimole, \([C{r^{3 + }}] = 1.5\) millimole and \(E = 1.067\) V...
MCQ+1 / -02021
35Electrochemistry
Find the emf of the following cell reaction. Given, \(E_{\mathrm{Cr}^{3+} / \mathrm{Cr}^{2+}}^{\Upsilon}=-0.72 \mathrm{~V}\) and \(E_{\mathrm{Fe}^{2+} / \mathrm{Fe}}^{\Upsilon}= -0.42 \mathrm{~V}\) at \(25^{\circ} \mathrm{C}\) is $$\mathrm{...
MCQ+1 / -02021
36Electrochemistry
At \(291 \mathrm{~K}\), saturated solution of \(\mathrm{BaSO}_4\) was found to have a specific conductivity of \(3.648 \times 10^{-6} \mathrm{ohm}^{-1} \mathrm{~cm}^{-1}\) and that of water being used is $$1.25 \times 10^{-6} \mathrm{ohm}^{...
MCQ+1 / -02021