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Indian Navy SSR Electrochemistry — practice questions

Explore 29 free Electrochemistry questions in Indian Navy SSR Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Electrochemistry questions and exercises with answers

Showing questions 1–29 of 29.

Why is the cell potential temperature-dependent?Read the answer and worked solution →For Hg²⁺/Hg (E° = +0.79 V) and Cu²⁺/Cu (E° = +0.34 V), the spontaneous reaction is:Read the answer and worked solution →For Daniell cell, cell reaction Zn + Cu²⁺ → Zn²⁺ + Cu. Cell EMF:Read the answer and worked solution →Standard reduction potential ranking. Which is the strongest oxidizing agent?Read the answer and worked solution →Galvanic cell or electrolytic cell?Read the answer and worked solution →Complete the standard cell potential relationRead the answer and worked solution →Order these electrodes by standard potential, lowest firstRead the answer and worked solution →Match each electrode to the potential your syllabus givesRead the answer and worked solution →True or false: conductivity on dilutionRead the answer and worked solution →Strong electrolyte or weak electrolyte?Read the answer and worked solution →Kohlrausch's lawRead the answer and worked solution →Match each relation to what it linksRead the answer and worked solution →True or false: cells and electrodesRead the answer and worked solution →Tap every statement true of a galvanic cellRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Complete the thermodynamic linksRead the answer and worked solution →What the Nernst equation is forRead the answer and worked solution →Which quantity is being described?Read the answer and worked solution →True or false: batteries, fuel cells and corrosionRead the answer and worked solution →Order the steps: find a standard cell potentialRead the answer and worked solution →Flip and pair: symbol with meaningRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Tap every factor conductivity depends onRead the answer and worked solution →Assertion and reason: potentialsRead the answer and worked solution →Reading the definitions backRead the answer and worked solution →Complete the dilution behaviourRead the answer and worked solution →True or false: the standard scaleRead the answer and worked solution →

Worked practice questions

Why is the cell potential temperature-dependent?

  1. Both ΔG and the Nernst RT/nF term are T-dependent
  2. E does not depend on T
  3. Only for non-redox cells
  4. Only when K = 1
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Correct answer: A. Both ΔG and the Nernst RT/nF term are T-dependent

E° = -ΔG°/(nF), and ΔG° = ΔH° - TΔS°. So E° varies with T according to ΔS°. Also Nernst correction term has RT/F. Hence cells have specific 'standard temperature' (typically 25°C).

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For Hg²⁺/Hg (E° = +0.79 V) and Cu²⁺/Cu (E° = +0.34 V), the spontaneous reaction is:

  1. Hg + Cu²⁺ → Hg²⁺ + Cu
  2. Neither
  3. Both
  4. Cu + Hg²⁺ → Cu²⁺ + Hg
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Correct answer: D. Cu + Hg²⁺ → Cu²⁺ + Hg

Larger E° is the stronger oxidizer at the cathode. Hg²⁺ (E° = +0.79) > Cu²⁺ (+0.34), so Hg²⁺ is the oxidizer. Cu (lower E°) gets oxidized. **Net:** Cu + Hg²⁺ → Cu²⁺ + Hg. E°_cell = 0.79 - 0.34 = +0.45 V (positive, spontaneous).

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For Daniell cell, cell reaction Zn + Cu²⁺ → Zn²⁺ + Cu. Cell EMF:

  1. E°_Cu + E°_Zn
  2. 0 V
  3. -1.10 V
  4. E°_Cu - E°_Zn = 0.34 - (-0.76) = 1.10 V
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Correct answer: D. E°_Cu - E°_Zn = 0.34 - (-0.76) = 1.10 V

E°_cell = E°_cathode - E°_anode (both as reduction potentials). **For Daniell:** E°_cell = E°(Cu²⁺/Cu) - E°(Zn²⁺/Zn) = 0.34 - (-0.76) = 1.10 V. Positive E°, so reaction is spontaneous.

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