ICSE Class 10 Hydrocarbons — Mock Test (2027)
Free online mock test for Hydrocarbons (ICSE Class 10 Chemistry) — 76 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 Hydrocarbons 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.![newman_projections_ethane.png]() The curved arrow on the staggered projection in the figure marks the dihedral angle. Of the two conformations shown, which one has the lower torsional strain and is therefore more stable?
- A.The staggered conformation (ii)
- B.The eclipsed conformation (i)
- C.Both have equal stability
- D.Neither, because ethane has no stable conformation
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2.In the Markovnikov addition of HBr to propene, the secondary carbocation predominates over the primary one because:
- A.The secondary carbocation is more stable and is formed at a faster rate
- B.The primary carbocation is more stable
- C.The bromide ion prefers the terminal carbon
- D.Propene contains a peroxide impurity
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3.Assertion (A): Alkanes were earlier known as paraffins. Reason (R): Under normal conditions alkanes do not react with acids, bases and other reagents.
- A.Both A and R are true and R is the correct explanation of A
- B.Both A and R are true but R is NOT the correct explanation of A
- C.A is true but R is false
- D.A is false but R is true
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4.Assertion (A): The reddish orange colour of a solution of bromine in carbon tetrachloride is decolourised when an alkyne is added. Reason (R): The bromine adds across the triple bond, and this decolourisation is used as a test for unsaturation.
- A.Both A and R are true and R is the correct explanation of A
- B.Both A and R are true but R is NOT the correct explanation of A
- C.A is true but R is false
- D.A is false but R is true
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5.Partial reduction of an alkyne with dihydrogen over Lindlar's catalyst (Pd partially deactivated by quinoline or sulphur) gives:
- A.The cis-alkene
- B.The trans-alkene
- C.An alkane
- D.A vicinal dihalide
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