Thermodynamics PYQs - Last 5 Years
JEE Main / Chemistry / Physical Chemistry / 123 recent questions
ChemistryPhysical Chemistry2022-2026
Practice 123 JEE Main Chemistry questions from Thermodynamics. Use the year-wise and type-wise breakdown to prioritize recent PYQs, then continue into the question list below.
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Last 5 Years Thermodynamics Questions
Showing 23 of 123 filtered questions.
1Thermodynamics
1.0 mol of monoatomic ideal gas is expanded from state 1 to state 2 as shown in the figure. The magnitude of the work done for the expansion of gas from state 1 to state 2 at 300 K is ____________ J. (Nearest integer)
(Given : R = 8.3 J K$...
(Given : R = 8.3 J K$...
INTEGER+4 / -12022
2Thermodynamics
\(\Delta\)G\(^\circ\) vs T plot for the formation of MgO, involving reaction 2Mg + O2 \(\to\) 2MgO, will look like :
MCQ+4 / -12022
3Thermodynamics
17.0 g of NH3 completely vapourises at \(-\)33.42\(^\circ\)C and 1 bar pressure and the enthalpy change in the process is 23.4 kJ mol\(-\)1. The enthalpy change for the vapourisation of 85 g of NH3 under the same conditions is _________ kJ.
INTEGER+4 / -12022
4Thermodynamics
2.2 g of nitrous oxide (N2O) gas is cooled at a constant pressure of 1 atm from 310 K to 270 K causing the compression of the gas from 217.1 mL to 167.75 mL. The change in internal energy of the process, \(\Delta\)U is '\(-\)x' J. The value...
INTEGER+4 / -12022
5Thermodynamics
When 600 mL of 0.2 M HNO3 is mixed with \(400 \mathrm{~mL}\) of 0.1 M NaOH solution in a flask, the rise in temperature of the flask is ___________ \(\times 10^{-2}{ }\,^{\circ} \mathrm{C}\).
(Enthalpy of neutralisation $$=57 \mathrm{~kJ} \...
(Enthalpy of neutralisation $$=57 \mathrm{~kJ} \...
INTEGER+4 / -12022
6Thermodynamics
4.0 L of an ideal gas is allowed to expand isothermally into vacuum until the total volume is 2.0 L. The amount of heat absorbed in this expansion is ____________ L atm.
INTEGER+4 / -12022
7Thermodynamics
For combustion of one mole of magnesium in an open container at 300 K and 1 bar pressure, \(\Delta\)CH\(\Theta\) = \(-\)601.70 kJ mol\(-\)1, the magnitude of change in internal energy for the reaction is __________ kJ. (Nearest integer)
(G...
(G...
INTEGER+4 / -12022
8Thermodynamics
Which of the following relation is not correct?
MCQ+4 / -12022
9Thermodynamics
Among the following the number of state variables is ______________.
Internal energy (U)
Volume (V)
Heat (q)
Enthalpy (H)
Internal energy (U)
Volume (V)
Heat (q)
Enthalpy (H)
INTEGER+4 / -12022
10Thermodynamics
Given below are two statements: One is labelled as Assertion \(\mathbf{A}\) and the other is labelled as Reason \(\mathbf{R}\)
Assertion A : The reduction of a metal oxide is easier if the metal formed is in liquid state than solid state.
R...
Assertion A : The reduction of a metal oxide is easier if the metal formed is in liquid state than solid state.
R...
MCQ+4 / -12022
11Thermodynamics
Match List-I with List-II.
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overflow:hidden;padding:10px 5px;word-break:normal;}...
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overflow:hidden;padding:10px 5px;word-break:normal;}...
MCQ+4 / -12022
12Thermodynamics
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)
INTEGER+4 / -12022
13Thermodynamics
The molar heat capacity for an ideal gas at constant pressure is \(20.785 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}\). The change in internal energy is \(5000 \mathrm{~J}\) upon heating it from \(300 \mathrm{~K}\) to $$500 \mathrm{~K}...
INTEGER+4 / -12022
14Thermodynamics
A gas (Molar mass = 280 \(\mathrm{~g} \mathrm{~mol}^{-1}\)) was burnt in excess \(\mathrm{O}_{2}\) in a constant volume calorimeter and during combustion the temperature of calorimeter increased from \(298.0 \mathrm{~K}\) to \(298.45\) $$\m...
INTEGER+4 / -12022
15Thermodynamics
For complete combustion of methanol
CH3OH(I) + \({3 \over 2}\)O2(g) \(\to\) CO2(g) + 2H2O(I)
the amount of heat produced as measured by bomb calorimeter is 726 kJ mol\(-\)1 at 27\(^\circ\)C. The enthalpy of combustion for the reaction is $$...
CH3OH(I) + \({3 \over 2}\)O2(g) \(\to\) CO2(g) + 2H2O(I)
the amount of heat produced as measured by bomb calorimeter is 726 kJ mol\(-\)1 at 27\(^\circ\)C. The enthalpy of combustion for the reaction is $$...
INTEGER+4 / -12022
16Thermodynamics
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\(^\circ\)C, then the internal energy for vaporization in kJ mol\(-\)1 is ___________. [n...
INTEGER+4 / -12022
17Thermodynamics
\(2.4 \mathrm{~g}\) coal is burnt in a bomb calorimeter in excess of oxygen at \(298 \mathrm{~K}\) and \(1 \mathrm{~atm}\) pressure. The temperature of the calorimeter rises from \(298 \mathrm{~K}\) to \(300 \mathrm{~K}\). The enthalpy chan...
INTEGER+4 / -12022
18Thermodynamics
For the reaction
\(\mathrm{H}_{2} \mathrm{F}_{2}(\mathrm{~g}) \rightarrow \mathrm{H}_{2}(\mathrm{~g})+\mathrm{F}_{2}(\mathrm{~g})\)
\(\Delta U=-59.6 \mathrm{~kJ} \mathrm{~mol}^{-1}\) at \(27^{\circ} \mathrm{C}\).
The enthalpy change for the...
\(\mathrm{H}_{2} \mathrm{F}_{2}(\mathrm{~g}) \rightarrow \mathrm{H}_{2}(\mathrm{~g})+\mathrm{F}_{2}(\mathrm{~g})\)
\(\Delta U=-59.6 \mathrm{~kJ} \mathrm{~mol}^{-1}\) at \(27^{\circ} \mathrm{C}\).
The enthalpy change for the...
INTEGER+4 / -12022
19Thermodynamics
The standard entropy change for the reaction
4Fe(s) + 3O2(g) \(\to\) 2Fe2O3(s) is \(-\)550 J K\(-\)1 at 298 K.
[Given : The standard enthalpy change for the reaction is \(-\)165 kJ mol\(-\)1]. The temperature in K at which the reaction att...
4Fe(s) + 3O2(g) \(\to\) 2Fe2O3(s) is \(-\)550 J K\(-\)1 at 298 K.
[Given : The standard enthalpy change for the reaction is \(-\)165 kJ mol\(-\)1]. The temperature in K at which the reaction att...
INTEGER+4 / -12022
20Thermodynamics
At 25\(^\circ\)C and 1 atm pressure, the enthalpy of combustion of benzene (I) and acetylene (g) are \(-\) 3268 kJ mol\(-\)1 and \(-\)1300 kJ mol\(-\)1, respectively. The change in enthalpy for the reaction 3 C2H2(g) \(\to\) C6H6 (I), is :
MCQ+4 / -12022
21Thermodynamics
The enthalpy of combustion of propane, graphite and dihydrogen at \(298 \mathrm{~K}\) are \(-2220.0 \mathrm{~kJ} \mathrm{~mol}^{-1},-393.5 \mathrm{~kJ} \mathrm{~mol}^{-1}\) and \(-285.8 \mathrm{~kJ} \mathrm{~mol}^{-1}\) respectively. The ma...
INTEGER+4 / -12022
22Thermodynamics
While performing a thermodynamics experiment, a student made the following observations.
HCl + NaOH \(\to\) NaCl + H2O \(\Delta\)H = \(-\)57.3 kJ mol\(-\)1
CH3COOH + NaOH \(\to\) CH3COONa + H2O \(\Delta\)H = \(-\)55.3 kJ mol\(-\)1
The entha...
HCl + NaOH \(\to\) NaCl + H2O \(\Delta\)H = \(-\)57.3 kJ mol\(-\)1
CH3COOH + NaOH \(\to\) CH3COONa + H2O \(\Delta\)H = \(-\)55.3 kJ mol\(-\)1
The entha...
INTEGER+4 / -12022
23Thermodynamics
At 25\(^\circ\)C and 1 atm pressure, the enthalpies of combustion are as given below :
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MCQ+4 / -12022