ICSE Class 10 Organic Chemistry — Mock Test (2027)
Free online mock test for Organic Chemistry (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 Organic Chemistry 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.Write the equation for the oxidation of ethanol to ethanoic acid using acidified potassium dichromate. What is the primary role of the oxidizing agent in this reaction?
- A.It supplies nascent oxygen [O] to oxidize ethanol to ethanoic acid via ethanal.
- B.It acts as a catalyst to speed up the reaction without being consumed.
- C.It neutralizes the ethanoic acid formed to shift the equilibrium forward.
- D.It provides hydrogen atoms to reduce ethanol to ethanoic acid.
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2.Assertion: Ethene undergoes addition reactions. Reason: Ethene is an unsaturated hydrocarbon. (a) Both assertion and reason are true and reason is the correct explanation of assertion. (b) Both assertion and reason are true, but reason is not the correct explanation of assertion. (c) Assertion is true, but reason is false. (d) Assertion is false, but reason is true.
- a.Both assertion and reason are true and reason is the correct explanation of assertion.
- b.Both assertion and reason are true, but reason is not the correct explanation of assertion.
- c.Assertion is true, but reason is false.
- d.Assertion is false, but reason is true.
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3.An organic compound 'X' contains carbon, oxygen, and hydrogen only. The percentage composition by mass of carbon and hydrogen are 47.4% and 10.5% respectively. The relative molecular mass of 'X' is 76. Which of the following is the molecular formula of 'X'? (Atomic weights: C = 12, O = 16, H = 1)
- A.C₂H₄O₃
- B.C₃H₈O₂
- C.C₄H₁₀O
- D.C₂H₆O₂
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4.Ester is formed by
- a.Two carboxylic acid
- b.One carboxylic acid and one alcohol
- c.Two alcohol
- d.None of the above
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5.Which balanced chemical equation correctly represents the reaction of calcium carbide with water to produce ethyne?
- A.CaC₂ + H₂O → CaO + C₂H₂
- B.CaC₂ + 2H₂O → Ca(OH)₂ + C₂H₂
- C.2CaC₂ + 2H₂O → 2CaO + C₂H₂ + H₂
- D.CaC₂ + H₂O → Ca(OH)₂ + C₂H₄
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