ICSE Class 10 Thermodynamics — Mock Test (2027)
Free online mock test for Thermodynamics (ICSE Class 10 Chemistry) — 96 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 Thermodynamics 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.For CaCO3(s) -> CaO(s) + CO2(g), given df_H[CaCO3] = -1206.9, df_H[CaO] = -635.1 and df_H[CO2] = -393.5 kJ/mol, the reaction enthalpy is:
- A.178.3 kJ/mol
- B.-178.3 kJ/mol
- C.2235.5 kJ/mol
- D.-1028.6 kJ/mol
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2.For Fe2O3(s) + 3H2(g) -> 2Fe(s) + 3H2O(l), given df_H[H2O,l] = -285.83 and df_H[Fe2O3,s] = -824.2 kJ/mol (df_H of elements = 0), the reaction enthalpy is:
- A.-33.3 kJ/mol
- B.33.3 kJ/mol
- C.538.37 kJ/mol
- D.-857.5 kJ/mol
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3.Assertion (A): The oxidation of iron, 4Fe(s) plus 3O2(g) giving 2Fe2O3(s), is spontaneous at 298 K even though its system entropy change is negative. Reason (R): The large negative enthalpy of the reaction makes the entropy change of the surroundings strongly positive, so the total entropy change is positive.
- 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.For a reaction at 298 K, the standard Gibbs energy change dG is -5.705 kJ/mol. The equilibrium constant K is (R = 8.314 J/mol/K, 2.303 R T = 5705 J/mol):
- A.1
- B.0.1
- C.10
- D.100
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5.For a strongly exothermic reaction (DrG large and negative), the equilibrium constant K is expected to be:
- A.Much smaller than 1
- B.Much larger than 1
- C.Exactly 1
- D.Negative
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