Chemistry · JEE

The first law of thermodynamics: Concept of work, heat, internal energy and enthalpy, heat capacity, molar heat capacity Concepts for JEE

37+ syllabus-aligned questions available

Quick answer

Master The first law of thermodynamics: Concept of work, heat, internal energy and enthalpy, heat capacity, molar heat capacity by understanding definitions, standard results, and typical JEE question patterns — then practise with syllabus-aligned MCQs on Goodmarks.

Build clear conceptual foundations for The first law of thermodynamics: Concept of work, heat, internal energy and enthalpy, heat capacity, molar heat capacity before speed practice. This guide covers what JEE expects and how to test yourself with MCQs.

Concept explainer

The first law of thermodynamics: Concept of work, heat, internal energy and enthalpy, heat capacity, molar heat capacity is a core JEE Main Chemistry subtopic under Chemical Thermodynamics. Master the definitions, standard results, and typical MCQ patterns tested in JEE Main and Advanced.

Key points

Understand the definition and scope of The first law of thermodynamics: Concept of work, heat, internal energy and enthalpy, heat capacity, molar heat capacity in the JEE syllabus
Memorise key formulas and standard results linked to The first law of thermodynamics: Concept of work, heat, internal energy and enthalpy, heat capacity, molar heat capacity
Practise 20–40 syllabus-aligned MCQs with step-by-step solutions

JEE tips

Revise The first law of thermodynamics: Concept of work, heat, internal energy and enthalpy, heat capacity, molar heat capacity with a one-page formula sheet before attempting mixed tests
After each practice set, log mistakes specific to The first law of thermodynamics: Concept of work, heat, internal energy and enthalpy, heat capacity, molar heat capacity and reattempt after 48 hours

Common trap

Students often rush The first law of thermodynamics: Concept of work, heat, internal energy and enthalpy, heat capacity, molar heat capacity questions without checking units, sign conventions, or boundary conditions — always verify assumptions before calculating.

Syllabus context

Part of Chemical Thermodynamics in JEE Main Chemistry.

Free sample questions

Attempt 8 free MCQs for The first law of thermodynamics: Concept of work, heat, internal energy and enthalpy, heat capacity, molar heat capacity. Unlock 29+ more with Pro.

Unlock full bank

Q1ChemistryUnit 4: Chemical Thermodynamics

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

Q2ChemistryUnit 4: Chemical Thermodynamics

When 229 J of energy is supplied as heat at constant pressure to 3 mol

A r(g),

the temperature of the sample is increased by

2.55 \mathrm{K}

. Calculate the motor heat capacity at constant volume:

Q3ChemistryUnit 4: Chemical Thermodynamics

An ideal gas is compressed in a closed container its U?

Q4ChemistryUnit 4: Chemical Thermodynamics

Root mean square velocity of molecules of a diatomic gas is to be increased to 1.5 times, If the process is done adiabtically, the ratio of initial volume to the final volumes is :

Q5ChemistryUnit 4: Chemical Thermodynamics

Under which of the following conditions is the relation,

\triangle \boldsymbol{H}=\triangle \boldsymbol{U}+\boldsymbol{P} \triangle \boldsymbol{V}

valid for a closed system?

Q6ChemistryUnit 4: Chemical Thermodynamics

The molar enthalpy change for

\boldsymbol{H}_{2} \boldsymbol{O}(l) \rightleftharpoons \boldsymbol{H}_{2} \boldsymbol{O}(\boldsymbol{g})

\boldsymbol{3} \boldsymbol{7} \boldsymbol{3} K

and

\boldsymbol{1}

\boldsymbol{m}

41 k J /

mol. Assuming ideal behavior the internal energy change for vaporization of 1 mol of water at

373 K

and 1 atm in

\mathrm{kJ} \mathrm{mol}^{-1}

is:

Q7ChemistryUnit 4: Chemical Thermodynamics

Calculate the temperature of a hydrogen-oxygen flame assuming that the gases at

25^{\circ} \mathrm{C}

are mixed in stoichiometric proportion and react completely to give

H_{2} O(g) . \Delta H_{298}^{\circ}

of combustion of

\boldsymbol{H}_{2}

-\mathbf{5 8}

kcal

\boldsymbol{m o l}^{-1}

The reaction is at constant pressure and the

C_{p}

values are

(7 / 2) R

for each gas.

(\boldsymbol{R}=\mathbf{2} \boldsymbol{c} \boldsymbol{a} \boldsymbol{l})

Q8ChemistryUnit 4: Chemical Thermodynamics

Assertion

C_{P}-C_{V}=R

for an ideal gas. Reason

\left[\frac{\partial E}{\partial V}\right]_{T}=0

for an ideal gas.

Want unlimited The first law of thermodynamics: Concept of work, heat, internal energy and enthalpy, heat capacity, molar heat capacity practice?

Pro unlocks the full question bank, topic filters, and attempt history.

Get started free View Pro plans

Frequently asked questions

What concepts in The first law of thermodynamics: Concept of work, heat, internal energy and enthalpy, heat capacity, molar heat capacity are essential for JEE?

Focus on core ideas across The first law of thermodynamics: Concept of work, heat, internal energy and enthalpy, heat capacity, molar heat capacity. JEE tests application, not just memorisation.