Electrochemistry PYQs - Last 5 Years

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Practice 49 COMEDK 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 49 of 49 filtered questions.

1Electrochemistry

Consider a Galvanic cell in which the following reactions occurs: $\mathrm{Fe}^{2+}(\mathrm{aq})+\mathrm{Ag}^{+}(\mathrm{aq}) \rightarrow \mathrm{Fe}^{3+}(\mathrm{aq})+\mathrm{Ag}(\mathrm{s})$. What is the standard potential of the cell? Gi...

2Electrochemistry

Identify the correct mathematical expression which represents the variation in molar conductivity of a weak acid having concentration C and ionisation constant $\mathrm{K}_{\mathrm{a}}$
( $\lambda_m^{\infty}=$ molar conductivity at infinite...

3Electrochemistry

$3.482 \times 10^{-1} \mathrm{~g}$ of Fe gets deposited when an aqueous solution of Ferric sulphate is electrolysed for 20 minutes using a current of " $x$ " amperes. Find " $x$ ". (Atomic mass of $\mathrm{Fe}=56 \mathrm{amu}$ ).

4Electrochemistry

Two statements, one Assertion and the other Reason are given. Choose the right option.
Assertion: The Molar conductivity of KCl increases very slowly with dilution and approaches a limiting value when dilution is infinite.
Reason: In case o...

5Electrochemistry

What will be the change in the electrode potential of chromium electrode dipping into chromic sulphate solution, when the electrolyte is diluted 10 times at $25^{\circ} \mathrm{C}$ ? $\left[\mathrm{E}^0\left(\mathrm{Cr}^{3+} / \mathrm{Cr}\r...

6Electrochemistry

Which of the following is always true about a spontaneous cell reaction in a galvanic cell?

7Electrochemistry

Resistance of 0.2 M solution of an electrolyte is $50 \Omega$. The conductivity of the solution is $1.3 \mathrm{Sm}^{-1}$. If the resistance of 0.4 M solution of the same electrolyte is $260 \Omega$, its molar conductivity is:

8Electrochemistry

The $\Delta \mathrm{G}^{\circ}$ for the reaction, $C d^{2+}(a q)+Z n(s) \rightarrow Z n^{2+}(a q)+C d(s)$ is: $\left[E_{C d^{2+} / C d}^o=-0.403, E_{Z n^{2+} / Z n}^o=-0.763 \mathrm{~V}\right]$

9Electrochemistry

The quantity of Ca that can be produced from molten $\mathrm{CaCl}_2$, with the same quantity of electricity (in coulombs) required to produce 4.8 g of Mg from molten $\mathrm{MgCl}_2$ is: [Atomic mass of $\mathrm{Mg}=24 \mathrm{u}$; Atomic...

10Electrochemistry

$$ \begin{aligned} &\text { Using the data given below, the strongest reducing agent is: }\\ &\begin{array}{ll} \mathrm{E}_{\mathrm{Cr}_2 \mathrm{O}_7}^{\mathrm{o}}{ }^{2-} / \mathrm{Cr}^{3+}=1.33 \mathrm{~V} & \mathrm{E}_{\mathrm{MnO}_4^{-...

11Electrochemistry

A current of 2.5 amperes is passed through 800 ml of 0.48 M solution of $\mathrm{CuSO}_4$ for 1.0 hour with a current efficiency of $80 \%$. If the volume of the solution remains unchanged, what is the final molarity of the solution?

12Electrochemistry

What is the reduction potential of a half-cell consisting of a Pt electrode dipped in $2.2 \mathrm{M} \mathrm{Fe}^{2+}$ and $0.04 \mathrm{M} \mathrm{Fe}^{3+}$ solution where the reaction taking place is conversion of $\mathrm{Fe}^{3+}$ ions...

13Electrochemistry

The EMF of the cell $\mathrm{Al} / \mathrm{Al}^{3+}(0.01 \mathrm{M}) \| \mathrm{Fe}^{2+}(0.02 \mathrm{M}) / \mathrm{Fe}$ is 1.209 V . The EMF of the cell can be increased by

14Electrochemistry

When $0.1 \mathrm{~mol} \mathrm{~L}^{-1}$ of KCl was filled in a Conductivity cell the resistance was 80 ohms at 298 K . (Conductivity of 0.1 M KCl at 298 K is $1.29 \mathrm{~S} \mathrm{~m}^{-1}$. The same cell when filled with an unknown e...

15Electrochemistry

Two statements, one Assertion and the other Reason, are given. Choose the correct option.
Assertion : During the electrolysis of aqueous $\mathrm{NaCl}, \mathrm{Cl}_2$ is liberated at the anode in preference to $\mathrm{O}_2$ and water gets...

16Electrochemistry

Identify the two incorrect electrochemical reactions shown as taking place in the given cells at the respective electrodes.

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17Electrochemistry

For a cell $2 \mathrm{M}_{(\mathrm{S})}+\mathrm{O}_2(\mathrm{~g})+4 \mathrm{H}^{+} \rightarrow 2 \mathrm{M}^{2+}(\mathrm{aq})+2 \mathrm{H}_2 \mathrm{O}_{(\mathrm{l})}$ the $\mathrm{E}^0$ cell $=+1.67 \mathrm{~V}$. When $\left[\mathrm{M}^{2+...

18Electrochemistry

For the cell reaction $4 \mathrm{Br}^{-}+\mathrm{O}_2+4 \mathrm{H}^{+} \rightarrow 2 \mathrm{Br}_2+2 \mathrm{H}_2 \mathrm{O}$ at 298 K , the $\mathrm{E}^0$ cell $=0.16 \mathrm{~V}$. What would be the $\mathrm{K}_{\mathrm{c}}$ (Equilibrium c...

19Electrochemistry

What would be the cell potential for the Galvanic cell which is represented by the electrochemical reaction:

$$
\begin{aligned}
& 2 \mathrm{Cr}_{(\mathrm{S})}+3 \mathrm{Fe}^{2+}(0.02 \mathrm{M}) \rightarrow 2 \mathrm{Cr}^{3+}(0.2 \mathrm{M...

20Electrochemistry

What is the standard electrode potential at 298 K for the reaction: $\mathrm{Cu}^{2+}+1 \mathrm{e}-\rightarrow \mathrm{Cu}^{+1}$ ?
Given: $\mathrm{E}_0 \mathrm{Cu}^{+1} / \mathrm{Cu}=0.5 \mathrm{~V} \quad & \quad \mathrm{E}_0 \mathrm{Cu}^...

21Electrochemistry

A current of 1.5 A is passed for 2 hours through an aqueous solution of $\mathrm{PdX} \mathrm{n}_{\mathrm{n}}$ where X is a monovalent anion. During the electrolysis process 2.977 g of Palladium metal gets deposited at the cathode. Calculat...

22Electrochemistry

Two statements, one Assertion and the other Reason are given. Choose the correct option.
Assertion: For strong electrolytes the plot of Molar conductivity versus Concentration gives a straight line with slope equal to +A and intercept equal...

23Electrochemistry

The Standard Reduction potential at $25^{\circ} \mathrm{C}$ for $\left(\mathrm{MnO}_4\right)^{-1} / \mathrm{H}^{+}$is +1.49 V . The $\mathrm{E}^0$ values for four Metal ions :
(a). $\mathrm{Co}^{3+} / \mathrm{Co}^{2+}$
(b). $\mathrm{Cr}^{3+...

24Electrochemistry

The $E_{M^{3+} / M^{2+}}^o$ values for $\mathrm{Cr}, \mathrm{Mn}, \mathrm{Fe}$ and Co are $-0.41,+1.57,+0.77$ and +1.97 V respectively.
For which of these metals, the change in oxidation state from +2 to +3 is the easiest?

25Electrochemistry

Given below are 4 equations showing Molar conductivities at infinite dilution of various electrolytes. Which one of them represents the correct equation?
$$\begin{aligned}
& \left(\Lambda_m^0\right)_{N a B r}-\left(\Lambda_m^0\right)_{N a C...

26Electrochemistry

What would be the EMF of the cell in which the following reaction occurs:
$$\begin{aligned}
& \mathrm{Cd}(\mathrm{S})+2 \mathrm{H}^{+} \rightarrow \mathrm{Cd}^{2+}+\mathrm{H}_{2(\mathrm{~g})} \\
& {\left[\mathrm{H}^{+}\right]=0.02 \mathrm{M...

27Electrochemistry

Match the chemical reactions taking place at the Anode of the cell with the correct cell in which the reaction occurs.

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28Electrochemistry

Propane in presence of \(\mathrm{O}_2\) gas undergoes complete combustion to produce \(\mathrm{CO}_2\) and \(\mathrm{H}_2 \mathrm{O}\). The required \(\mathrm{O}_2\) for this combustion reaction was produced by the electrolysis of water. Fo...

29Electrochemistry

\(0.1 \mathrm{M}\) solution of \(\mathrm{AgNO}_3\) is taken in a Conductivity cell and a potential difference of \(40 \mathrm{~V}\) is applied across the ends of a column of this solution whose diameter is \(4.0 \mathrm{~cm}\) and length of...

30Electrochemistry

What is the quantity of charge, in Faraday units, required for the reduction of 3.5 moles of \(\mathrm{Cr}_2 \mathrm{O} 7^{2-}\) in acid medium?

31Electrochemistry

A current of 3.0A is passed through 750 ml of 0.45 M solution of CuSO\(_4\) for 2 hours with a current efficiency of 90%. If the volume of the solution is assumed to remain constant, what would be the final molarity of CuSO\(_4\) solution?

32Electrochemistry

Arrange the following redox couples in the increasing order of their reducing strength:
$$\begin{array}{ll}
{[\mathrm{A}]=\mathrm{Cu} / \mathrm{Cu}^{2+}} & \mathrm{E}^0=-0.34 \mathrm{~V} \\
{[\mathrm{~B}]=\mathrm{Ag} / \mathrm{Ag}^{+}} & \m...

33Electrochemistry

Given below are 2 statements: Assertion and Reason. Choose the correct option.
Assertion: When Molar conductivity for a strong electrolyte is plotted versus \(\sqrt{C}(\mathrm{~mol} / \mathrm{L})^{1 / 2}\), a straight line is obtained with ...

34Electrochemistry

A dry cell consists of a moist paste of \(\mathrm{NH}_4 \mathrm{Cl}\) and \(\mathrm{ZnCl}_2\) contained in a \(\mathrm{Zn}\) casing which encloses a Carbon rod surrounded by black \(\mathrm{MnO}_2\) paste. What is the role of $$\mathrm{ZnCl...

35Electrochemistry

Identify the correct statement regarding corrosion of iron rod left exposed to atmosphere.

36Electrochemistry

When 0.1 mole of \(\mathrm{MnO}_4{ }^{2-}\) is oxidised, the quantity of electricity required to completely oxidise \(\mathrm{MnO}_4{ }^{2-}\) to \(\mathrm{MnO}_4^{-}\) is

37Electrochemistry

The \(\mathrm{E}^{\circ}\) values of \(\mathrm{A} . \mathrm{B}\) and \(\mathrm{C}\) are given. Which element/(s) is/(are) good for coating the surface of iron to prevent corrosion?
Given: $$[\mathrm{E}_{\mathrm{Fe}^{2+} / \mathrm{Fe}}^0=-0....

38Electrochemistry

\(\mathrm{Cu}^{+}\) undergoes disproportionation, according to the equation,
\(2 \mathrm{Cu}^{+} \rightleftharpoons \mathrm{Cu}^{2+}+\mathrm{Cu}\)
The \(\mathrm{E}^{\circ}\) value for the reaction is:
$$[\mathrm{E}_{\mathrm{Cu}^{2+} / \ma...

39Electrochemistry

Identify the incorrect statement among the following.

40Electrochemistry

The limiting molar conductivity of \(\mathrm{NH}_4 \mathrm{OH}\) is \(238 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}\). At \(25^{\circ} \mathrm{C}\), molar conductance of \(0.1 \mathrm{M}\) aqueous solution of ammonium hydroxide is $$9.5...

41Electrochemistry

The reaction taking place in a galvanic cell is as given
$$\mathrm{A}(\mathrm{s})+\mathrm{B}^{2+}\left(\mathbf{1} \mathbf{1} \mathbf{1 0} \mathbf{0}^{-\mathrm{M}} \mathbf{M}\right) \rightarrow \mathrm{B}_{(\mathrm{s})}+\mathrm{A}^{2+}(0.1 \...

42Electrochemistry

Match the items in Column I with their description in Column II

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43Electrochemistry

When Lead Storage battery is in the process of getting charged which one of the following reactions takes place?

44Electrochemistry

If electrolysis of water is carried out for a time duration of 2 hours, how much electric current in amperes would be required to liberate \(100 \mathrm{~ml}\) of \(\mathrm{O}_2\) gas measured under standard conditions of temperature and pr...

45Electrochemistry

The Molar conductivity of \(0.05 \mathrm{M}\) solution of \(\mathrm{MgCl}_2\) is \(194.5 \mathrm{~ohm}^{-1} \mathrm{~cm}^2\) per mole at room temperature. A Conductivity cell with electrodes having \(3.0 \mathrm{~cm}^2\) surface area and $$...

46Electrochemistry

For a cell reaction, \(A(s)+B^{2+}(a q) \longrightarrow A^{2+}(a q)+B(s)\); the standard emf of the cell is \(0.295 \mathrm{~V}\) at \(25^{\circ} \mathrm{C}\). The equilibrium constant at \(25^{\circ} \mathrm{C}\) will be

47Electrochemistry

Assuming no change in volume, the time required to obtain solution of \(\mathrm{pH}=4\) by electrolysis of \(100 \mathrm{~mL}\) of \(0.1 \mathrm{~M} \mathrm{~NaOH}\) (using current \(0.5 \mathrm{~A}\) ) will be

48Electrochemistry

Calculate the molar conductance of 0.025 M aqueous solution of calcium chloride at 25\(^\circ\)C. The specific conductance of calcium chloride is 12.04 \(\times\) 10\(^{-2}\) Sm\(^{-1}\)

49Electrochemistry

What will be the emf of the following cell at 25\(^\circ\)C?
Fe/Fe\(^{2+}\) (0.001 M) | | H\(^+\) (0.01 M) | H\(_2\)(g) (1 Bar) | Pt(s)
\(E_{(F{e^{2+}} /Fe)}^o = - 0.44\) V; \(E_{({H^ + }/{H_2})}^o = - 0.00\) V