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## Thermodynamics

### Chemistry

#### Previous Years Questions

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Which of the following p-V curve represents maximum work done?
NEET 2022
For irreversible expansion of an ideal gas under isothermal condition, the correct option is :
NEET 2021
Which one among the following is the correct option for right relationship between CP and CV for one mole of ideal gas?...
NEET 2021
NEET 2020 Phase 1
For the reaction, 2Cl(g) $$\to$$ Cl2(g), the correct option is :
NEET 2020 Phase 1
Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar. T...
NEET 2019
In which case change in entropy is negative?
NEET 2019
The bond dissociation energies of X2 , Y2 and XY are in the ratio of 1 : 0.5 : 1. $$\Delta$$H for the formation of XY ...
NEET 2018
A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial...
NEET 2017
For a given reaction, $$\Delta$$H = 35.5 kJ mol$$-$$1 and $$\Delta$$S = 83.6 J K$$-$$1 mol$$-$$1. The reaction is spon...
NEET 2017
For a sample of perfect gas when its pressure is changed isothermally from pi to pf, the entropy change is given by...
NEET 2016 Phase 2
The heat of combination of carbon to CO2 is $$-$$393.5 kJ/mol. The heat released upon formation of 35.2 g of CO2 from ca...
AIPMT 2015
For the reaction, $${X_2}{O_{4\left( l \right)}}\,\, \to \,\,2X{O_{2(g)}}$$ $$\Delta$$U = 2.1 kcal, $$\Delta$$S = 20 ...
AIPMT 2014
Which of the following statements is correct for the spontaneous adsorption of a gas?
AIPMT 2014
Three thermochemical equations are given below (i)&nbsp;&nbsp;C(graphite) + O2(g)&nbsp;$$\to$$&nbsp;CO2(g);&nbsp;$$\De... NEET 2013 (Karnataka) When 5 litres of a gas mixture of methane and propane is perfectly combusted at 0oC and 1 atmosphere, 16 litres of oxyge... NEET 2013 (Karnataka) A reaction having equal energies of activation for forward and reverse reactions has NEET 2013 The enthalpy of fusion of water is 1.435 kcal/mol. The molar entropy change for the melting of ice at 0oC is AIPMT 2012 Prelims Standard enthalpy of vaporisation$$\Delta $$vapHo for water at 100oC is 40.66 kJ mol$$-$$1. The internal energy of vapo... AIPMT 2012 Prelims In which of the following reactions, standard reaction entropy change ($$\Delta $$So) is positive and standard Gibb's en... AIPMT 2012 Prelims Consider the following processes : .tg {border-collapse:collapse;border-spacing:0;border:none;} .tg td{font-family:Ari... AIPMT 2011 Mains Which of the following is correct option for free expansion of an ideal gas under adiabatic condition ? AIPMT 2011 Prelims Enthalpy change for the reaction, 4H(g)&nbsp;&nbsp;$$ \to $$&nbsp;&nbsp;2H2(g) is$$-$$869.6 kJ The dissociation energ... AIPMT 2011 Prelims If the enthalpy change for the transition of liquid water to steam is 30 kJ mol$$-$$1 at 27oC, the entropy change for th... AIPMT 2011 Prelims The following two reactions are known Fe2O3(s) + 3CO(g)$$ \to $$2Fe(s) + 3CO2(g);$$\Delta $$H =$$-$$26.8 kJ FeO(s)... AIPMT 2010 Mains For vaporization of water at 1 atmospheric pressure, the values of$$\Delta $$H and$$\Delta $$S are 40.63 kJ mol$$-$$1 ... AIPMT 2010 Mains Three moles of an ideal gas expanded spontaneously into vacuum. The work done will be AIPMT 2010 Mains Match List I (Equations) with List II (Type of processes) and select the correct option. .tg {border-collapse:collaps... AIPMT 2010 Mains Standard entropies of X2, Y2 and XY3 are 60, 40 and 50 J K$$-$$1 mol$$-$$1 respectively. For the reaction 1/2X2 + 3/2Y... AIPMT 2010 Prelims For an endothermic reaction, energy of activation is Ea and enthalpy of reaction is$$\Delta $$H (both of these in kJ/mo... AIPMT 2010 Prelims From the following bond energies : H$$-$$H bond energy&nbsp;&nbsp;&nbsp;:&nbsp;431.37 kJ mol$$-$$1 C$$=$$C bond ene... AIPMT 2009 The values of$$\Delta $$H and$$\Delta $$S for the reaction, C(graphite) + CO2(g)$$ \to $$&nbsp;&nbsp;2CO(g) are 170... AIPMT 2009 Bond dissociation enthalpy of H2, Cl2 and HCl are 434, 242 and 431 kJ mol$$-$$1 respectively. Enthalpy of formation of H... AIPMT 2008 For the gas phase reaction, PCl5(g)&nbsp;&nbsp;$$\rightleftharpoons$$PCl3(g) + Cl2(g) which of the following condition... AIPMT 2008 Which of the following are not state functions ? (I)&nbsp;q + w&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(II)&nbsp;q (III)&nbsp;w&n... AIPMT 2008 Given that bond energies of H$$-$$H and Cl$$-$$Cl are 430 kJ mol$$-$$1 and 240 kJ mol$$-$$1 respectively and$$\Delt...
AIPMT 2007
Consider the following reactions : (i)&nbsp;H+(aq) + OH$$-$$(aq) = H2O(l),&nbsp;&nbsp;$$\Delta$$H = $$-$$ X1 kJ mol$$-... AIPMT 2007 Assume each reaction is carried out in an open container. For which reaction will$$\Delta $$H =$$\Delta $$E ? AIPMT 2006 The enthalpy of hydrogenation of cyclohexene is is$$-$$119.5 kJ mol$$-$$1. If resonance energy of benzene is$$-$$150... AIPMT 2006 The enthalpy and entropy change for the reaction: Br2(l) + Cl2(g)$$ \to $$2BrCl(g) are 30 kJ mol$$-$$1 and 105 J K... AIPMT 2006 Identify the correct statement for change of Gibb's energy for a system ($$\Delta $$Gsystem) at constant temperature and... AIPMT 2006 The absolute enthalpy of neutralisation of the reaction : Mg(O)(s) + 2HCl(aq)$$ \to $$MgCl2(aq) + H2O(l) will be ... AIPMT 2005 A reaction occurs spontaneously if AIPMT 2005 Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction ? AIPMT 2005 The work done during the expansion of a gas from a volume of 4 dm3 to 6 dm3 against a constant external pressure of 3 at... AIPMT 2004 Considering entropy (S) as a thermodynamic parameter, the criterion for the spontaneity of any process is AIPMT 2004 Standard enthalpy and standard entropy changes for the oxidation of ammonia at 298 K are$$-$$382.64 kJ mol$$-$$1 and ... AIPMT 2004 If the bond energies of H$$-$$H, Br$$-$$Br, and H$$-$$Br are 433, 192 and 364 kJ mol$$-$$1 respectively, the$$\De...
AIPMT 2004
What is the entropy change (in J K$$-$$1 mol$$-$$1) when one mole of ice is converted into water at 0oC? (The enthalpy c...
AIPMT 2003
The molar heat capacity of water at constant pressure, C, is 75 J K$$-$$1 mol$$-$$1. When 1.0 kJ of heat is supplied to ...
AIPMT 2003
Formation of solution from two components can be considered as (i)&nbsp;Pure solvent $$\to$$&nbsp;separated solvent m...
AIPMT 2003
For which one of the following equations is $$\Delta$$Horeact equal to $$\Delta$$Hof for the product ? ...
AIPMT 2003
The densities of graphite and diamond at 298 K are 2.25 and 3.31 g cm$$-$$3, respectively. If the standard free energy d...
AIPMT 2003
For the reaction, C3H8(g) + 5O2(g) $$\to$$&nbsp;3CO2(g) + 4H2O(l) at constant temperature, $$\Delta$$H $$-$$ $$\Delt... AIPMT 2003 2 mole of ideal gas at 27oC temperature is expanded reversibly from 2 lit. to 20 lit. Find entropy change. (R = 2 cal/mo... AIPMT 2002 Heat of combustion$$\Delta $$Ho for C(s), H2(g) and CH4(g) are$$-$$94,$$-$$68 and$$-$$213 kcal/mol, then$$\Delta ...
AIPMT 2002
In a closed insulated container a liquid is stirred with a paddle to increase the temperature which of the following is ...
AIPMT 2002
Which reaction is not feasible?
AIPMT 2002
Unit of entropy is
AIPMT 2002
Enthalpy of CH4 + $${1 \over 2}$$ O2 $$\to$$ CH3OH is negative. If enthalpy of combustion of CH4 and CH3OH are x and y...
AIPMT 2001
PbO2 &nbsp;$$\to$$&nbsp;PbO; $$\Delta$$G298 &lt; 0 SnO2 $$\to$$ SnO; &nbsp;$$\Delta$$G298 &gt; 0 Most probable oxi...
AIPMT 2001
When 1 mol of gas is heated at constant volume temperature is raised from 298 to 308 K. Heat supplied to the gas is 500 ...
AIPMT 2001
Change in enthalpy for reaction, 2H2O2(l) $$\to$$ 2H2O(l) + O2(g) if heat of formation of H2O2(l) and H2O(l) are...
AIPMT 2001
For the reaction, C2H5OH(l) + 3O2(g) $$\to$$ 2CO2(g) + 3H2O(l) which one is true...
AIPMT 2000
The entropy change in the fusion of one mole of a solid melting at 27oC (latent heat of fusion is 2930 J mol–1) is :...
AIPMT 2000
2Zn + O2 $$\to$$ 2ZnO;&nbsp;&nbsp;$$\Delta$$Go = $$-$$ 616 J 2Zn + S2 $$\to$$ 2ZnS;&nbsp;&nbsp;$$\Delta$$Go = -\$...
AIPMT 2000
Cell reaction is spontaneous when
AIPMT 2000

## MCQ (More than One Correct Answer)

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The correct thermodynamic conditions for the spontaneous reaction at all temperatures is
NEET 2016 Phase 1

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