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
-
1.Ethene burns in a sufficient supply of air or oxygen. Which of the following correctly represents the balanced chemical equation for this reaction and describes the flame observed?
- A.C₂H₄ + O₂ → CO₂ + H₂O; bright yellow flame
- B.C₂H₄ + 3O₂ → 2CO₂ + 2H₂O; pale blue flame
- C.2C₂H₄ + 3O₂ → 4CO + 4H₂O; sooty flame
- D.C₂H₄ + 2O₂ → 2CO + 2H₂O; pale blue flame
-
2.What are functional groups in organic chemistry, and which of the following best represents five common examples of them?
- A.Specific atoms or groups of atoms attached to alkyl groups that determine chemical properties, e.g., –OH, –CHO, –CO–, –O–, –COOH.
- B.Carbon chains that define the physical state of organic compounds, e.g., methane, ethane, propane, butane, pentane.
- C.Types of bonds (single, double, triple) that influence the reactivity of organic molecules, e.g., alkanes, alkenes, alkynes.
- D.Structural isomers that differ in the arrangement of atoms but share the same molecular formula, e.g., butane and isobutane.
-
3.What are the two main causes of isomerism?
- A.Difference in the mode of linking of atoms (Structural Isomerism) and difference in the arrangement of atoms or groups in space (Stereo Isomerism).
- B.Difference in molecular weight and difference in the number of carbon atoms in the compound.
- C.Presence of single bonds only and presence of double or triple bonds in the compound.
- D.Difference in physical state (solid, liquid, gas) and difference in boiling points of the compounds.
-
4.In the laboratory preparation of ethane by the reaction of soda lime with sodium propionate, which of the following correctly describes the process and the balanced chemical equation for the reaction?
- A.Ethane is prepared by heating sodium propionate with soda lime (NaOH + CaO), producing ethane and sodium carbonate: C₂H₅COONa + NaOH → C₂H₆ + Na₂CO₃ (catalyzed by CaO).
- B.Ethane is formed by reacting sodium propionate with soda lime at room temperature, yielding ethane and calcium carbonate: C₂H₅COONa + CaO → C₂H₆ + CaCO₃.
- C.Heating sodium propionate with soda lime produces ethene and sodium hydroxide: C₂H₅COONa + NaOH → C₂H₄ + Na₂CO₃ + H₂O.
- D.Ethane is prepared by mixing sodium propionate with limewater, resulting in ethane and sodium oxide: C₂H₅COONa + Ca(OH)₂ → C₂H₆ + Na₂O + CaCO₃.
-
5.Define nomenclature in the context of organic chemistry. Which of the following correctly identifies the two systems of nomenclature used for organic compounds?
- A.Nomenclature is the process of determining the structure of organic compounds. The two systems are the trivial system and the structural system.
- B.Nomenclature is the system of assigning names to organic compounds. The two systems are the trivial system (common names) and the IUPAC system (systematic names).
- C.Nomenclature refers to the classification of organic compounds by their physical properties. The two systems are the empirical system and the molecular system.
- D.Nomenclature is the method of synthesizing organic compounds. The two systems are the traditional system and the modern system.
Ready? Take the full 20-question test free — instant marking, no sign-up needed.
▶ Start free mock test