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ISC Class 12 Electrochemistry — practice questions

Explore 50 free Electrochemistry questions in ISC Class 12 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 1–30 of 50.

The van't Hoff factor $i$ for a $0.01$ M aqueous solution of NaCl, assuming complete dissociation, is approximately:Read the answer and worked solution →A solution is best defined as:Read the answer and worked solution →In a salt-in-water solution, the solvent is:Read the answer and worked solution →The empirical rule 'like dissolves like' predicts that:Read the answer and worked solution →Which of the following is **not** a colligative property?Read the answer and worked solution →When a non-volatile solute is dissolved in a volatile solvent, the vapour pressure of the solution:Read the answer and worked solution →Match: Electrochemistry (ISC 12)Read the answer and worked solution →Order of Reactivity: Metals (ISC 12)Read the answer and worked solution →For a cell reaction with $E^\circ_\text{cell} = +0.59\,\text{V}$ and $n = 2$, the equilibrium constant $K$ at $298\,\text{K}$ is approximately:Read the answer and worked solution →Complete the standard cell potential relationRead 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 →The situation in which the charge buildup near the Zn rod prevents further oxidation is called:Read the answer and worked solution →Which half-reaction from the given notes represents oxidation?Read the answer and worked solution →Which of the following is classified as a secondary (rechargeable) cell?Read the answer and worked solution →The standard electrode potential of the Standard Hydrogen Electrode (SHE) is defined as:Read the answer and worked solution →The Daniell cell (Zn-Cu) has E°cell = +1.10 V. Calculate ΔG° (F = 96500 C/mol):Read the answer and worked solution →Faraday's first law of electrolysis states that the mass deposited is:Read the answer and worked solution →The byproduct of a hydrogen-oxygen fuel cell (used in space + electric cars) is:Read the answer and worked solution →Order these electrodes by standard potential, lowest firstRead 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 →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 →Which quantity is being described?Read the answer and worked solution →True or false: batteries, fuel cells and corrosionRead the answer and worked solution →True or false: the standard scaleRead the answer and worked solution →

Worked practice questions

The van't Hoff factor $i$ for a $0.01$ M aqueous solution of NaCl, assuming complete dissociation, is approximately:

  1. $1$
  2. $0.5$
  3. $2$
  4. $3$
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Correct answer: C. $2$

NaCl dissociates in water: $\mathrm{NaCl} \rightarrow \mathrm{Na^+} + \mathrm{Cl^-}$. One formula unit produces two particles in solution. Van't Hoff factor $i = \dfrac{\text{actual moles of particles}}{\text{moles of solute formula units}}$. For complete dissociation of NaCl, $i = 2$. In reality, ion pairing slightly reduces $i$ below the theoretical value, especially at higher concentrations. At dilute $0.01$ M the assumption of complete dissociation is reasonable, and the experimental $i$ is close to $1.9$. The question asks for the theoretical value assuming complete dissociation, so 2 is the cleanest answer. Compare with $\mathrm{CaCl_2}$: dissociates into 3 ions, so $i = 3$ (option D) — common trap.

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A solution is best defined as:

  1. Any mixture of a solid and a liquid
  2. A pure substance in a single phase
  3. A heterogeneous mixture of two or more substances
  4. A homogeneous mixture of two or more pure substances
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Correct answer: D. A homogeneous mixture of two or more pure substances

A true solution is a *homogeneous* mixture of two or more pure substances. A binary solution has one solute and one solvent.

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In a salt-in-water solution, the solvent is:

  1. Cannot be defined for a salt solution
  2. Water
  3. Salt
  4. Their mixture
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Correct answer: B. Water

The solvent is the component present in larger amount (water here) the salt, present in smaller amount, is the solute.

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More Chemistry topics

Amines and BiomoleculesChemical KineticsThe d- and f-Block Elements & Coordination CompoundsAldehydes, Ketones and Carboxylic AcidsHaloalkanes, Alcohols and EthersSolutions