List of top Chemistry Questions on Thermodynamics asked in JEE Main

Match List - I with List - II. List - I (Partial Derivatives) \(and\) List - II (Thermodynamic Quantity)

In the light of the above statements, choose the correct answer from the options given below:

Which of the following is correct for adiabatic free expansion against vacuum?

Consider the following reaction at 298 K.
\(\frac{3}{2}​O_{2(g)}​⇌O_{3(g)}​,K_p​=2.47×10^{−29}\). 
\(Δ_r​G^{\theta}\) for the reaction is ______ kJ. (Given R=\(8.314\;J K^{−1}mol^{−1}\))

Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R)
Assertion (A): Enthalpy of neutralisation of strong monobasic acid with strong monoacidic base is always –57 kJ mol^–1
Reason (R): Enthalpy of neutralisation is the amount of heat liberated when one mole of H⁺ ions furnished by acid combine with one mole of ^–OH ions furnished by base to form one mole of water. In the light of the above statements.
Choose the correct answer from the options given below.

The heat of combustion of solid benzoic acid at constant volume is \(-321.30 \, \text{kJ}\) at \(27^\circ \text{C}\). The heat of combustion at constant pressure is \((-321.30 - xR)\, \text{kJ}\). The value of \(x\) is:

If three moles of an ideal gas at 300 K expand isothermally from 30 dm³ to 45 dm³ against a constant opposing pressure of 80 kPa, then the amount of heat transferred is ______ J.

Mass of methane required to produce 22 g of CO₂​ after complete combustion is ______ g.
(Given Molar mass in g mol⁻¹: C=12.0, H=1.0, O=16.0).

$\text{For a certain thermochemical reaction } \text{M} \rightarrow \text{N at } T = 400 \, \text{K}, \, \Delta H^\circ = 77.2 \, \text{kJ mol}^{-1}, \, \Delta S = 122 \, \text{JK}^{-1}, \\ \text{log equilibrium constant (log K) is } - \_\_\_\_\_ \times 10^{-1}.$

$28.0\, L$ of $CO _2$ is produced on complete combustion of $168 \, L$ gaseous mixture of ethene and methane at $25^{\circ} C$ and $1 \, atm$ Heat evolved during the combustion process is ______$kJ$ Given : $\Delta H _{ c }\left( CH _4\right)=-900 \, kJ\, mol ^{-1}$ $\Delta H _{ c }\left( C _2 H _4\right)=-1400\, kJ \, mol ^{-1}$

While performing a thermodynamics experiment, a student made the following observations, 

$ HCl + NaOH \rightarrow NaCl + H _2 O$

$ \Delta H =-573 \,kJ \,mol ^{-1}$ 

$ CH _3 COOH + NaOH \rightarrow CH_3COONa + H _2 O$ 

$ \Delta H =-553 \,kJ\, mol ^{-1} $ 

The enthalpy of ionization of $CH _3 COOH$ as calculated by the student is _____ $kJ \,mol ^{-1}$ (nearest integer)

Given below are two statements Statement I : Pig iron is obtained by heating cast iron with scrap iron Statement II : Pig iron has a relatively lower carbon content than that of cast iron In the light of the above statements, choose the correct answer from the options given below

When 2 litre of ideal gas expands isothermally into vacuum to a total volume of 6 litre, the change in internal energy is______J (Nearest integer)

1 mole of ideal gas is allowed to expand reversibly and adiabatically from a temperature of $27^{\circ} C$ The work done is $3\, kJ \,mol ^{-1}$ The final temperature of the gas is _______ $K$ (Nearest integer).
Given $C_{ V }=20 \,J\, mol ^{-1} K ^{-1}$

An athlete is given $100\, g$ of glucose $\left( C _6 H _{12} O _6\right)$ for energy This is equivalent to $1800\, kJ$ of energy The $50 \%$ of this energy gained is utilized by the athlete for sports activities at the event In order to avoid storage of energy, the weight of extra water he would need to perspire is ___ $g$ (Nearest integer) Assume that there is no other way of consuming stored energy Given: The enthalpy of evaporation of water is $45 \,kJ \,m o l^{-1}$ Molar mass of $C H\, \&\, O$ are 12,1 and $16\, g \,mol ^{-1}$

A fish swimming in water body when taken out from the water body is covered with a film of water of weight 36 g. When it is subjected to cooking at 100 °C, then the internal energy for vaporization in kJ mol^–1 is ________. [nearest integer]
[Assume steam to be an ideal gas. Given Δ_vapH^Θ for water at 373 K and 1 bar is 41.1 kJ mol^–1; R = 8.31 J K^–1 mol^–1]

When 5 moles of He gas expand isothermally and reversibly at 300 K from 10 litre to 20 litre, the magnitude of the maximum work obtained is _____ J. [nearest integer] (Given : R = 8.3 J K^–1 mol^–1 and log 2 = 0.3010)

Find out value of $C_p/C_y$ for an ideal gas undergoing reversible adiabatic process for which $P ∝ T^3$ is given