ICSE Class 10 Electrolysis — Mock Test (2027)

Free online mock test for Electrolysis (ICSE Class 10 Chemistry) — 20 competency-based questions based on the latest CISCE 2027 syllabus, with instant marking. Try the samples below, then take the full test free.

Sample questions

1. 1.Which of the following correctly illustrates reduction in terms of the addition of hydrogen, along with an appropriate example?
   • A.Reduction involves the addition of hydrogen: Cl₂ + H₂S → S + 2HCl, where chlorine gains hydrogen to form hydrogen chloride.
   • B.Reduction involves the removal of hydrogen: 2HCl → H₂ + Cl₂, where hydrogen chloride loses hydrogen.
   • C.Reduction involves the addition of oxygen: 2Mg + O₂ → 2MgO, where magnesium gains oxygen.
   • D.Reduction involves the loss of electrons: Zn → Zn²⁺ + 2e⁻, where zinc loses electrons.
2. 2.An electroplating company is electroplating a copper object with a thin layer of silver using an electrolytic cell. (i) Calculate the volume of silver required for the coating. (ii) Determine the mass of silver required for the coating. (iii) Calculate the number of moles of silver needed. (iv) Determine the total charge (in coulombs) required to deposit the silver.
3. 3.What is electro-refining, and which of the following correctly describes the process of electro-refining impure copper, including the electrodes and electrolyte used, as well as the electrode reactions?
   • A.Electro-refining is the process of removing impurities from a metal using electrolysis. It uses impure copper as the anode, pure copper as the cathode, and acidified copper sulphate as the electrolyte. At the cathode: Cu²⁺ + 2e⁻ → Cu; at the anode: Cu - 2e⁻ → Cu²⁺.
   • B.Electro-refining is the process of coating a metal with another metal. It uses pure copper as the anode, impure copper as the cathode, and copper chloride as the electrolyte. At the cathode: Cu → Cu²⁺ + 2e⁻; at the anode: Cu²⁺ + 2e⁻ → Cu.
   • C.Electro-refining is the process of extracting metals from ores. It uses graphite electrodes and molten copper sulphate as the electrolyte. At the cathode: 2H⁺ + 2e⁻ → H₂; at the anode: 2O²⁻ → O₂ + 4e⁻.
   • D.Electro-refining is the process of purifying metals by heating. It uses impure copper as the cathode, pure copper as the anode, and sulphuric acid as the electrolyte. No electrode reactions occur.
4. 4.Why is it necessary to add acid to water before proceeding with the electrolysis of water?
   • A.Pure water is a poor conductor; acid increases ion concentration for better conductivity.
   • B.Acid reacts with water to form a gas that enhances electrolysis efficiency.
   • C.Acid prevents the formation of hydrogen and oxygen gases during electrolysis.
   • D.Pure water contains no ions, so acid is added to neutralize the solution.
5. 5.Classify the following substances under the headings: (a) strong electrolytes, (b) weak electrolytes, (c) non-electrolytes. Acetic acid, ammonium chloride, ammonium hydroxide, carbon tetrachloride, dilute hydrochloric acid, sodium acetate, dilute sulphuric acid.