Chemistry · JEE

Important Questions: Chemical Thermodynamics for JEE

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The most important Chemical Thermodynamics questions for JEE cover conceptual traps, standard results, and numerical patterns from Fundamentals of thermodynamics: System and surroundings, extensive and intensive properties, state functions, entropy, types of processes, The first law of thermodynamics: Concept of work, heat, internal energy and enthalpy, heat capacity, molar heat capacity, Hess's law of constant heat summation, Enthalpies of bond dissociation, combustion, formation, atomization, sublimation, phase transition, hydration, ionization and solution, and more. Goodmarks provides 100+ high-yield MCQs with full solutions.

Focus on what matters most. These important Chemical Thermodynamics questions cover high-weightage concepts from Fundamentals of thermodynamics: System and surroundings, extensive and intensive properties, state functions, entropy, types of processes, The first law of thermodynamics: Concept of work, heat, internal energy and enthalpy, heat capacity, molar heat capacity, Hess's law of constant heat summation, Enthalpies of bond dissociation, combustion, formation, atomization, sublimation, phase transition, hydration, ionization and solution, and more — the topics JEE repeats every year.

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Subtopics in Chemical Thermodynamics

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Q1ChemistryUnit 4: Chemical Thermodynamics

Which is a common standard for calibrating a bomb calorimeter in teaching laboratories?

Q2ChemistryUnit 4: Chemical Thermodynamics

Which of the following statement(s) is/are true? "Internal energy of an ideal gas

Q3ChemistryUnit 4: Chemical Thermodynamics

\boldsymbol{C}_{\boldsymbol{g} \text {raphite}}+\boldsymbol{O}_{\mathbf{2}(\boldsymbol{g})} \rightarrow \boldsymbol{C} \boldsymbol{O}_{2(\boldsymbol{g})} ; \boldsymbol{\Delta} \boldsymbol{H}=

-393.5 k J, \Delta H

of the reaction cannot be:

Q4ChemistryUnit 4: Chemical Thermodynamics

Under the same conditions of pressure and temperature, which property is the same for

\boldsymbol{H}_{2}

and

\boldsymbol{D}_{2} ?

Q5ChemistryUnit 4: Chemical Thermodynamics

Which of the following changes increases the overall density of the object?

Q6ChemistryUnit 4: Chemical Thermodynamics

Select incorrect statement(s):

Q7ChemistryUnit 4: Chemical Thermodynamics

Heat of combustion of

\boldsymbol{C H}_{4}, \boldsymbol{C}_{2} \boldsymbol{H}_{6}

and

C_{3} H_{8}

are respectively -210,-368.4 and

-526.8 \mathrm{Kcal}

mol

_{1}

Hence, heat of combustion of

C_{8} H_{16}

is approximately:

Q8ChemistryUnit 4: Chemical Thermodynamics

Assertion The gas is heated, if its temperature is less than its inversion temperature in Joule-Thomson effect. Reason Heating effect in gas is noticed during Joule-Thomson effect when

\boldsymbol{T}>\boldsymbol{T}_{i}

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Frequently asked questions

What makes a Chemical Thermodynamics question "important" for JEE?

Important questions test core concepts that appear frequently across JEE Main and Advanced papers — definitions, standard formulas, and classic problem types.

Which subtopics in Chemical Thermodynamics are high-weightage?

Key areas include Fundamentals of thermodynamics: System and surroundings, extensive and intensive properties, state functions, entropy, types of processes, The first law of thermodynamics: Concept of work, heat, internal energy and enthalpy, heat capacity, molar heat capacity, Hess's law of constant heat summation, Enthalpies of bond dissociation, combustion, formation, atomization, sublimation, phase transition, hydration, ionization and solution, and more. Prioritise these before moving to edge cases.

How many important questions should I revise?

Revise 30–50 important MCQs per unit in the last month before JEE. Focus on questions you got wrong at least once.

Can I practise only important questions on Goodmarks?

Pro users can filter by unit and subtopic to target high-yield areas. Free users can attempt sample questions on this page.