Main 5 · Advanced 15
Entropy
- Advanced 2026ChemistryList match
List-I contains various physical/chemical processes, and List-II contains combinations of changes in enthalpy and entropy . Match each entry in List-I to the appropriate entry in List-II, and choose the correct option.
- Main 2026ChemistryList match
Match List - I with List - II.
Given and are initial and final volumes respectively.
Choose the correct answer from the options given below :
- Advanced 2023ChemistryInteger
One mole of an ideal monoatomic gas undergoes two reversible processes ( and ) as shown in the given figure:
is an adiabatic process. If the total heat absorbed in the entire process ( and ) is , the value of is _____.
[Use, molar heat capacity of the gas at constant pressure, ]
- Advanced 2023ChemistryNumerical
The value of entropy change, (in ), at 300 K is _____.
[Use: . Given: at 0 K]
- Advanced 2022ChemistryMultiple correct
The correct option(s) about entropy (S) is(are)
[R = gas constant, F = Faraday constant, T = Temperature]
- Advanced 2021ChemistryMultiple correct
An ideal gas undergoes a reversible isothermal expansion from state I to state II followed by a reversible adiabatic expansion from state II to state III. The correct plot(s) representing the changes from state I to state III is(are)
(: pressure, : volume, : temperature, : enthalpy, : entropy)
- Advanced 2021ChemistryInteger
One mole of an ideal gas at 900 K, undergoes two reversible processes, I followed by II, as shown below. If the work done by the gas in the two processes are same, the value of is ____.
(: internal energy, : entropy, : pressure, : volume, : gas constant)
(Given: molar heat capacity at constant volume, of the gas is )
- Advanced 2017ChemistryMultiple correct
An ideal gas is expanded from to under different conditions. The correct statement(s) among the following is(are)
- Advanced 2017ChemistryMultiple correct
For a reaction taking place in a container in equilibrium with its surroundings, the effect of temperature on its equilibrium constant in terms of change in entropy is described by
- Main 2017ChemistrySingle correct
An ideal gas undergoes isothermal expansion at constant pressure. During the process :
- Advanced 2016ChemistrySingle correct
One mole of an ideal gas at 300 K in thermal contact with surroundings expands isothermally from 1.0 L to 2.0 L against a constant pressure of 3.0 atm. In this process, the change in entropy of surroundings in is
(1 L atm = 101.3 J)
- Main 2016ChemistrySingle correct
A reaction at 1 bar is non-spontaneous at low temperature but becomes spontaneous at high temperature. Identify the correct statement about the reaction among the following :
- Advanced 2015ChemistryMatrix match
Match the thermodynamic processes given under Column I with the expressions given under Column II.
- Advanced 2014ChemistrySingle correct
For the process
at C and 1 atmosphere pressure, the correct choice is - Main 2014ChemistrySingle correct
The molar heat capacity () of is 10 cals at 1000 K. The change in entropy associated with cooling of 32 g of vapour from 1000 K to 100 K at constant pressure will be :
(D = deuterium, at. mass = 2 u)
- Main 2014ChemistrySingle correct
The entropy (S°) of the following substances are :
(g) 186.2 J K mol
(g) 205.0 J K mol
(g) 213.6 J K mol
() 69.9 J K molThe entropy change (ΔS°) for the reaction
is : - Advanced 2012ChemistryMultiple correct
For an ideal gas, consider only - work in going from an initial state to the final state . The final state can be reached by either of the two paths shown in the figure. Which of the following choice(s) is (are) correct? [take as change in entropy and as work done]
- Advanced 2011ChemistryMatrix match
Match the transformations in column I with appropriate options in column II
- Advanced 2008ChemistryAssertion and reason
STATEMENT-1: There is a natural asymmetry between converting work to heat and converting heat to work.
and
STATEMENT-2: No process is possible in which the sole result is the absorption of heat from a reservoir and its complete conversion into work.
- Advanced 2007ChemistrySingle correct
For the process (1 bar, 373 K) → (1 bar, 373 K), the correct set of thermodynamic parameters is