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.
What to expect: This mock test covers key concepts from the Electrolysis chapter — including application-based and competency-focused questions aligned with how ICSE actually sets the paper.
Tip: Attempt without notes first to identify gaps, then review explanations for any wrong answers. Retake after a few days for best retention.
Sample questions
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1.Why is silver nitrate not used as an electrolyte for electroplating with silver?
- A.It causes rapid deposition of silver, leading to a rough and non-uniform coating.
- B.It reacts violently with the cathode, producing toxic gases.
- C.It is highly unstable and decomposes before electrolysis begins.
- D.It forms an insulating layer on the anode, stopping the process.
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2.Why is a graphite anode preferred to other inert electrodes during the electrolysis of fused lead bromide?
- A.Graphite reacts with bromine gas to form a protective layer, enhancing electrode life.
- B.Graphite is inert, has a high melting point, and does not react with bromine gas.
- C.Graphite is cheaper and more readily available than other inert electrodes.
- D.Graphite conducts electricity only at low temperatures, making it safer for electrolysis.
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3.(iv) Which of the following pairs of metals are extracted only by electrolysis?
- A.Na, Pb
- B.Ca, Cu
- C.Na, Ca
- D.Ag, K
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4.When a dilute aqueous solution of sodium chloride is electrolysed between platinum electrodes, hydrogen gas is evolved at the cathode but metallic sodium is not deposited. Why?
- A.Hydrogen ions are preferentially discharged because hydrogen is positioned higher than sodium in the electrochemical series.
- B.Sodium ions are not reduced because platinum electrodes are inert and do not react with sodium.
- C.Metallic sodium reacts immediately with water to form hydrogen gas and sodium hydroxide.
- D.Chloride ions are discharged at the cathode instead of sodium ions due to their higher concentration.
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5.Why is the electrolysis of molten lead bromide considered to be a redox reaction?
- A.It involves the simultaneous gain and loss of electrons by lead and bromide ions, respectively.
- B.It produces a metal and a gas without any electron transfer.
- C.It only involves the reduction of lead ions to lead metal.
- D.It occurs at high temperatures without any chemical changes.
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