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Electrochemistry

21 questions · Chemistry · IIT JAM
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Electrochemistry

21 questions · Chemistry · IIT JAM

  1. The molar conductivity of a 0.02 M weak acid HA is 3.2 mS m 2 mol −1 at 298 K. The p Ka​ of HA is ​. (round off to one decimal place) [Given: Limiting molar conductivity of HA = 39 mS m 2 mol −1…2025 · Q59 · Numerical
  2. A cell is constructed by Cl₂/Cl⁻(aq) and a standard hydrogen electrode half-cells. The standard potential of the complete cell is 1.38 V and (∂T∂E0​)P​=−1.24 mVK−1. The ΔSreaction0​…2025 · Q60 · Numerical
  3. In the cell reaction P+(aq)+Q(s)→P(s)+Q+(aq) the EMF of the cell, Ecell​ is zero. The standard EMF of the cell, Ecello​ is [Given: Activities of all solids are unity. Activity of P+(aq) is 2 M. Activity of…2024 · Q20 · MCQ
  4. Mobility of ions Li+,Na+,K+,Ag+ in water at 298 K follows the order2024 · Q30 · MCQ
  5. A salt QCl of a certain metal Q is electrolyzed to its elements. 40 g of metal Q is formed at an electrode. The volume of Cl₂ formed at the other electrode at 1 atm pressure and 298 K is ​ litres. (rounded off to…2024 · Q53 · Numerical
  6. The standard reduction potential (E0) of Fe 3+→ Fe is ​ V. [Given: Fe 3+→ Fe 2+E0 = 0.77 V and Fe 2+→ Fe E0 = -0.44 V] (round off to three decimal places)2023 · Q47 · Numerical
  7. The SI unit of the molar conductivity of an electrolyte solution is2023 · Q6 · MCQ
  8. A steady current of 1.25 A is passed through an electrochemical cell for 1.5 h using a 12 V battery. The total charge, *Q*, drawn during this process is ​ Coulombs. (*round off to the nearest integer*)2022 · Q50 · Numerical
  9. A galvanic electrochemical cell made of Zn^{2+}/Zn and Cu^{2+}/Cu half-cells produces 1.10 V at 25 °C. The ratio of [Zn^{2+}] to [Cu^{2+}] is maintained at 1.0. The ΔG° for the reaction when 1.0 mol of Zn gets dissolved is ​…2022 · Q55 · Numerical
  10. The dissociation constant of a weak monoprotic acid is 1.6 × 10⁻⁵ and its molar conductance at infinite dilution is 360.5 × 10⁻⁴ mho m² mol⁻¹. For 0.01 M solution of this acid, the specific conductance is n × 10⁻² mho m⁻¹. The value of n…2021 · Q48 · Numerical
  11. The mean ionic activity coefficient of 0.004 molal CaCl 2​ in water at 298 K (rounded off to three decimal places) is ​. (Given: Debye-Hückel constant for an aqueous solution at 298 K is 0.509 kg 1/2 mol −1/2…2021 · Q58 · Numerical
  12. The salt bridge in a galvanic cell allows the flow of2020 · Q3 · MCQ
  13. For the reaction, CuSO₄(aq) + Zn(s) → ZnSO₄(aq) + Cu(s), the value of ΔG° (in kJ mol⁻¹) is ​ (Round off to the nearest integer) (Reduction potential: Cu²⁺(aq)/Cu(s) = + 0.34 V; Zn²⁺(aq)/Zn(s) = - 0.76 V) (Faraday…2020 · Q57 · Numerical
  14. The limiting molar conductivity of La³⁺ and Cl⁻ ions in aqueous medium at 298 K are 209.10 × 10⁻⁴ and 76.35 × 10⁻⁴ S m² mol⁻¹, respectively. The transport number of Cl⁻ in an infinitely dilute aqueous solution of LaCl₃ at 298 K is ​…2019 · Q43 · Numerical
  15. With reference to the variation of molar conductivity (Λm​) with concentration for a strong electrolyte in an aqueous solution, the **CORRECT** statement is2018 · Q30 · MCQ
  16. The *emf* of a standard cadmium cell is 1.02 V at 300 K. The temperature coefficient of the cell is −5.0×10−5 V K −1. The value of ΔH∘ for the cell is ​ kJ mol −1 (rounded up to…2018 · Q56 · Numerical
  17. For a cell reaction, Pb(s)+Hg2​Cl2​(s)→PbCl2​(s)+2Hg(l), (∂T∂R0​)p​ is 1.45×10−4 VK−1. The entropy change (in J mol⁻¹ K⁻¹) for the reaction is [Given: 1 F =…2017 · Q49 · Numerical
  18. The standard reduction potentials of Ce⁴⁺/Ce³⁺ and Fe³⁺/Fe²⁺ are 1.44 and 0.77 V, respectively. The log₁₀K (K is the equilibrium constant) value for the following reaction is (final answer should be rounded off to two decimal places) Ce⁴⁺…2017 · Q51 · Numerical
  19. An electrochemical cell consists of two half-cell reactions AgCl(s) + e⁻ → Ag(s) + Cl⁻(aq) Cu(s) → Cu²⁺(aq) + 2e⁻ The mass of copper (in grams) dissolved on passing 0.5 A current for 1 hour is [Given: atomic mass of Cu is 63.6; F = 96500 C…2016 · Q26 · MCQ
  20. The concentration of K + ion inside a biological cell is 20 times higher than outside. The magnitude of potential difference between the two sides is [Given: 2.303 RT/F = 59 mV]2015 · Q27 · MCQ
  21. The standard reduction potentials of the Fe 3+/Fe 2+ and Fe 2+/Fe couples are 0.77 and –0.44 V, respectively. The standard reduction potential (in V) for the Fe 3+/Fe couple is ​2015 · Q58 · Numerical