Electrochemistry - ISC Class 12 Chemistry Questions with Answers
77 past-paper questions on Electrochemistry from ISC Class 12 Chemistry papers (2027-2018), newest first. Open one to see its answer.
- The molar conductivities at infinite dilution for $\text{NaI}$, $\text{CH}_3\text{COONa}$ and… 2027 · 3 marks · Numerical
- In a Daniell cell, during the passage of current, copper gets deposited at cathode. 2027 · 1 mark · Assertion-reason
- Three electrolytic cells (X), (Y) and (Z) containing solutions of $\text{AgNO}_3$, $\text{CuSO}_4$ and $\text{ZnSO}_4$… 2027 · 3 marks · Numerical
- The standard reduction electrode potential ($E^\circ$) of some metals is given below: Metal $E^\circ$ $\text{Ag}^+/\text{Ag}$… 2027 · 2 marks · Short answer
- Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: [methyl alcohol, ethyl alcohol, paired… 2027 · 1 mark · Fill in
- Write the Nernst equation and calculate the emf of the following cell at 298K… 2027 · 2 marks · Numerical
- Answer the following: The molar conductivity at infinite dilution for… 2026 · 3 marks · Short answer
- Calculate the values of $E_{\text{cell}}$ and $\Delta G$ for the following cell reaction at $25^\circ\text{C}$… 2026 · 3 marks · Numerical
- (1) Calculate the charge required in coulombs to deposit $6\cdot35\text{ g}$ of copper at cathode from $\text{CuSO}_4$ solution… 2026 · 3 marks · Short answer
- The molar conductivities at infinite dilution ($\Lambda_m^\infty$) for $\text{NaI}$, $\text{CH}_3\text{COONa}$ and… 2026 · 2 marks · Numerical
- Vishal set up an experiment to find the resistance of aqueous $\text{KCl}$ solution for different concentrations at… 2026 · 3 marks · Case based
- Ionic conductance at infinite dilution of $\text{Al}^{3+}$ and $\text{SO}_4^{2-}$ ions are… 2026 · 3 marks · Numerical
- Calculate the value of $\Delta G^\circ$ for the following cell at $25^\circ\text{C}$… 2026 · 2 marks · Numerical
- Answer the following: When a current of $0\cdot75\text{ ampere}$ is passed through a $\text{CuSO}_4$ solution for… 2026 · 3 marks · Short answer
- Calculate the value of $\Delta G^\circ$ for the following cell at $298\text{ K}$… 2026 · 2 marks · Numerical
- Kohlrausch observed an interesting pattern between the values of molar conductance at infinite dilution ($\Lambda^\infty_m$) for… 2026 · 3 marks · Case based
- A $0\cdot01\text{ M}$ solution of $\text{NaCl}$ is diluted by adding water. What will happen to its specific conductivity and… 2026 · 3 marks · Short answer
- In the year 1832, Michael Faraday performed many experiments on electrolysis. He established a relationship between the amount of… 2026 · 3 marks · Case based
- The standard reduction potentials of the following electrodes are given below. Answer the questions that follow: Electrodes SRP… 2025 · 2 marks · Short answer
- Dry cells are commonly used in clocks, torches, calculators etc. They are the most familiar type of commercial cells. What acts… 2025 · 3 marks · Short answer
- Answer the following questions: State Kohlrausch’s law of independent migration of ions. Calculate the molar conductivity of an… 2025 · 3 marks · Short answer
- Ships, being exposed to saltwater and atmospheric conditions, are highly susceptible to rust and corrosion. This is one method… 2025 · 3 marks · Short answer
- Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: [four, three, remains same, propane… 2025 · 1 mark · Fill in
- Nandini wants to electroplate her bracelet with silver. She gives the bracelet to an artist. After electroplating she gets the… 2025 · 3 marks · Numerical
- When the concentration of the solution of a weak electrolyte is ____, its ____ conductivity increases. 2025 · 1 mark · Fill in
- Answer the following: Graphical method fails to give the value of molar conductivity at infinite dilution of weak electrolyte… 2025 · 3 marks · Short answer
- The specific conductivity of $0\cdot0025\text{ M}$ acetic acid solution is… 2025 · 2 marks · Numerical
- How much charge is required for the reduction of $1\text{ mole}$ of $\text{Cu}^{2+}$ to $\text{Cu}$? 2025 · 1 mark · MCQ
- Yash measures the conductivity of two different solutions of 1M Ethanoic acid and 1M HCl each at $25^\circ\text{C}$. Will he… 2025 · 2 marks · Short answer
- Calculate the number of coulombs required to electroplate $4\cdot75\text{ g}$ of aluminium when electrode reaction is… 2025 · 2 marks · Numerical
- Answer the following: What happens to the voltage when the salt bridge is removed from the two half cells and why? Copper… 2025 · 3 marks · Short answer
- The above graph indicates the variation of molar conductivity of different electrolytes. $\text{NaCl}$, $\text{CH}_3\text{COOH}$… 2025 · 1 mark · MCQ
- ‘Freidrich Wilhelm Georg Kohlrausch was a German physicist who studied the electrical conductivity of electrolytic solutions… 2025 · 5 marks · Case based
- Geet has set-up the following galvanic cell by taking the electrolyte solution of $\text{Pb}(\text{NO}_3)_2$ and $\text{CrCl}_3$… 2025 · 3 marks · Short answer
- Sudeshna took her gold plated bangles to a goldsmith for cleaning and electroplating as they had become black due to constant… 2025 · 2 marks · Numerical
- The solution of two electrolytes A and B are diluted. $\Lambda_m$ of B increases $1\cdot5$ times while that of A increases 25… 2025 · 2 marks · Short answer
- Answer the following questions: Specific conductance of a solution decreases upon dilution. Why? The emf of a cell should be… 2025 · 3 marks · Short answer
- Choose the appropriate word(s) from the bracket [+2, ethane, tetrahedral, square planar, zero, dry cell, nickel-cadmium cell… 2025 · 1 mark · Fill in
- Rohan arranged three coulometers in series and passed one faraday of charge for a definite time to all three electrolytes as… 2025 · 2 marks · Short answer
- Calculate the $E^\circ_{\text{cell}}$ of the following if the cell potential ($E_{\text{cell}}$) is $0\cdot59\text{ V}$. (Given… 2025 · 2 marks · Numerical
- Choose the appropriate word(s) from the bracket [ethanol, [Fe(H2O)6]2+, anode, d2sp3, Cannizzaro, reducing, cathode, sp3d2… 2025 · 1 mark · Fill in
- Answer the following questions: What should be the sign (positive or negative) for $E^\circ_{\text{cell}}$ and $\Delta G^\circ$… 2025 · 3 marks · Short answer
- Calculate the value of $E^\circ_{\text{cell}}$, $E_{\text{cell}}$ and $\Delta G$ that can be obtained from the following cell at… 2025 · 2 marks · Numerical
- Answer the following questions: By referring to electrochemical series, how can anode and cathode half cells be identified in a… 2025 · 3 marks · Short answer
- Calculate the value of $E^\circ_{\text{cell}}$ and $\Delta G^\circ$ that can be obtained from the following cell under the… 2024 · 5 marks · Numerical
- Which one of the following statements is correct regarding the dry cell? (P) Zinc container acts as an anode in dry cell. (Q)… 2024 · 1 mark · MCQ
- Specific conductivity of all electrolytes decreases on dilution. 2024 · 1 mark · Assertion-reason
- A rusted piece of iron undergoes electrochemical reactions. Write the chemical reaction taking place at: (a) the electrode that… 2024 · 2 marks · Short answer
- Adding water to two beakers ‘A’ and ‘B’ containing $\text{NaOH}$ and $\text{CH}_3\text{COOH}$ solutions respectively will… 2024 · 1 mark · Assertion-reason
- Calculate the maximum possible electrical work that can be obtained from a galvanic cell under standard conditions at… 2024 · 2 marks · Numerical
- The molar conductivity vs $\sqrt{C}$ curve for $\text{Na}_2\text{SO}_4$, $\text{H}_2\text{SO}_4$, and $\text{NH}_4\text{OH}$ are… 2024 · 5 marks · Short answer
- Study the diagram given below that represents Cu-Ag electrochemical cell and answer the questions that follow. Given… 2024 · 5 marks · Numerical
- A potassium iodide ($\text{KI}$) solution containing starch turns blue on the addition of chlorine. Which one of the following… 2024 · 1 mark · MCQ
- A $0\cdot05\text{ M } \text{NH}_4\text{OH}$ solution offers the resistance of $30\cdot8\text{ ohms}$ to a conductivity cell at… 2024 · 5 marks · Numerical
- Calculate the standard free energy change ($\Delta G^\circ$) for the following chemical reaction… 2023 · 2 marks · Numerical
- The specific conductance of $2\cdot5 \times 10^{-4}\text{ M}$ formic acid is… 2023 · 5 marks · Numerical
- Write the Nernst equation for the cell reaction given below and calculate the emf of the cell at $298\text{ K}$… 2023 · 5 marks · Numerical
- A $0\cdot06\text{ molar}$ $\text{CH}_3\text{COOH}$ solution offers a resistance of $55\text{ ohms}$ to a conductivity cell at… 2023 · 5 marks · Numerical
- Question 2023 · 2 marks · Short answer
- Select and write the correct alternative from the choices given below: An alkyl isocyanide on complete reduction gives: For a… 2023 · 4 marks · Short answer
- The resistance of a conductivity cell with $0\cdot1\text{ M}$ $\text{KCl}$ solution is $200\text{ ohm}$. When the same cell is… 2023 · 5 marks · Numerical
- Calculate the emf of the following cell at $298\text{ K}$… 2023 · 2 marks · Numerical
- The limiting molar conductivities ($\Lambda^\infty_m$) for NaCl, KBr and KCl are 126, 152 and… 2022 · 2 marks · Short answer
- On dilution, the specific conductance of a solution: 2022 · 1 mark · MCQ
- When zinc granule is dipped into copper sulphate solution, copper is precipitated because: 2022 · 1 mark · MCQ
- When two Faradays of electricity is passed through an aqueous solution of CuSO4 and an aqueous solution of AgNO3. (Atomic weight… 2022 · 2 marks · Short answer
- For a spontaneous reaction $\Delta G^\circ$ and $E^\circ_{\text{cell}}$ will be respectively: 2022 · 1 mark · MCQ
- The standard electrode potential for the reaction is: (I)… 2022 · 2 marks · Short answer
- The standard reduction potential values of three metallic cations X, Y and Z are 0.52 V, -3.03 V and -1.18 V respectively. The… 2022 · 1 mark · MCQ
- Calculate the degree of dissociation ($\alpha$) of acetic acid, if its molar conductivity ($\Lambda_m$) is… 2020 · 3 marks · Numerical
- Calculate the emf and $\Delta G$ for the given cell at $25^\circ\text{C}$… 2020 · 3 marks · Numerical
- Define the following terms: (1) Specific conductance (2) Kohlrausch’s Law The resistance of a conductivity cell containing… 2019 · 5 marks · Short answer
- Calculate the mass of silver deposited at cathode when a current of $2\text{ amperes}$ is passed through a solution of… 2019 · 5 marks · Short answer
- Resistance of a conductivity cell filled with $0\cdot1\text{ mol L}^{-1}\text{ KCl}$ solution is $100\ \Omega$. If the resistance… 2018 · 5 marks · Short answer
- Calculate emf of the following cell at $298\text{ K}$… 2018 · 5 marks · Short answer
- The specific conductivity of a solution containing $5\text{ g}$ of anhydrous $\text{BaCl}_2$ (mol. wt. $= 208$) in… 2018 · 5 marks · Short answer
- Calculate the emf and $\Delta G^\circ$ for the cell reaction at $25^\circ\text{C}$… 2018 · 5 marks · Short answer
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