JEE Chemistry
Enthalpies (Bond, Combustion, Formation…): JEE Questions & Solutions
10 previous-year JEE Chemistry questions on Enthalpies (Bond, Combustion, Formation…), each with a worked step-by-step solution.
Previous-year questions
- 01Consider the following data: Δ_f H^⊖ (methane, g) = -X kJ mol⁻¹ Enthalpy of sublimation of graphite = Y kJ mol⁻¹ Dissociation enthalpy of…MCQMediumJEE 2026
- 02The heat of atomisation of methane and ethane are x kJ mol⁻¹ and y kJ mol⁻¹ respectively. The longest wavelength (λ) of light capable of…MCQMediumJEE 2026
- 03The formation enthalpies, Δ H_f^°, for H_(g) and O_(g) are 220.0 kJ mol⁻¹ and 250.0 kJ mol⁻¹, respectively, at 298.15 K, and Δ H_f^° for…NVAEasyJEE 2025
- 04Consider the following data: - Heat of formation of CO₂(g) = -393.5 kJ mol⁻¹ - Heat of formation of H₂O(l) = -286.0 kJ mol⁻¹ - Heat of…NVAEasyJEE 2025
- 05Given: Δ H^⊖_sub[C(graphite)] = 710 kJ mol⁻¹ Δ_(C-H) H^⊖ = 414 kJ mol⁻¹ Δ_(H-H) H^⊖ = 436 kJ mol⁻¹ Δ_(C=C) H^⊖ = 611 kJ mol⁻¹ The Δ_f H^⊖…NVAMediumJEE 2025
- 06Resonance in X₂Y can be represented as The enthalpy of formation of X₂Y ( X ≡ X(g) + 1/2 Y = Y(g) → X₂Y(g)) is 80 kJ mol⁻¹. The magnitude…NVAMediumJEE 2025
- 0728.0 L of CO₂ is produced on complete combustion of 16.8 L gaseous mixture of ethene and methane at 25^° C and 1 atm. Heat evolved during…NVAMediumJEE 2023
- 08The number of endothermic process/es from the following is: A. I₂ (g) → 2I (g) B. HCl (g) → H (g) + Cl (g) C. H₂O (l) → H₂O (g) D. C (s) +…NVAEasyJEE 2023
- 09Solid fuel used in rocket is a mixture of Fe₂O₃ and Al (in ratio 1: 2) the heat evolved (KJ) per gram of the mixture is (Nearest integer)…MCQMediumJEE 2023
- 10Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Isotopes of hydrogen…MCQEasyJEE 2023
Frequently asked questions
Our bank has 10 previous-year JEE Chemistry questions tagged to Enthalpies (Bond, Combustion, Formation…), drawn from JEE papers between 2023 and 2026, including 2 from 2026 alone. Each comes with a full step-by-step solution.
Enthalpies (Bond, Combustion, Formation…) is rated Advanced overall for JEE Chemistry. The PYQs on this page break down as 6 medium, 4 easy.
Of the 10 previous-year questions on Enthalpies (Bond, Combustion, Formation…), 4 are multiple-choice (MCQ) and 6 are numerical-value (NVA) questions.
Based on recent paper analysis, Enthalpies (Bond, Combustion, Formation…) is worth about 1 mark in JEE Main. It sits in Chemical Thermodynamics, a Class 11 Chemistry chapter.
More Chemical Thermodynamics topics
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