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MCQ (Single Correct Answer)

NEET 2024
In which of the following processes entropy increases? A. A liquid evaporates to vapour. B. Temperature of a crystalline solid lowered from $$130 \mat...
NEET 2024
Match List I with List II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-famil...
NEET 2024
The work done during reversible isothermal expansion of one mole of hydrogen gas at $$25^{\circ} \mathrm{C}$$ from pressure of 20 atmosphere to 10 atm...
NEET 2023 Manipur
Consider the following reaction :- $$2 \mathrm{H}_2(\mathrm{~g})+\mathrm{O}_2(\mathrm{~g}) \rightarrow 2 \mathrm{H}_2 \mathrm{O}(\mathrm{g}) \Delta_{\...
NEET 2023
The equilibrium concentrations of the species in the reaction $$\mathrm{A}+\mathrm{B} \rightleftharpoons \mathrm{C}+\mathrm{D}$$ are $$2,3,10$$ and $$...
NEET 2023
Which amongst the following options is the correct relation between change in enthalpy and change in internal energy?
NEET 2022 Phase 2
One mole of an ideal gas at 300 K is expanded isothermally from 1 L to 10 L volume. $$\Delta$$U for this process is : (Use R = 8.314 J k$$-$$1 mol$$-$...
NEET 2022 Phase 2
A vessel contains 3.2 g of dioxygen gas at STP (273.15 K and 1 atm pressure). The gas is now transferred to another vessel at constant temperature, wh...
NEET 2022 Phase 1
Which of the following p-V curve represents maximum work done?
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
For irreversible expansion of an ideal gas under isothermal condition, the correct option is :
NEET 2020 Phase 1
Hydrolysis of sucrose is given by the following reaction.Sucrose + H2O ⇌ Glucose + FructoseIf the equilibrium constant (Kc) is 2 $$ \times $$ 1013 at ...
NEET 2020 Phase 1
For the reaction, 2Cl(g) $$ \to $$ Cl2(g), the correct option is :
NEET 2020 Phase 1
The correct option for free expansion of an ideal gas under adiabatic condition is :
NEET 2019
In which case change in entropy is negative?
NEET 2019
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. The work done by the gas is [Gi...
NEET 2018
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 is –200 kJ mol–1. The bond dis...
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 spontaneous at (Assume that $$\Del...
NEET 2017
A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final v...
NEET 2016 Phase 2
For a sample of perfect gas when its pressure is changed isothermally from pi to pf, the entropy change is given by
AIPMT 2015
The heat of combination of carbon to CO2 is $$-$$393.5 kJ/mol. The heat released upon formation of 35.2 g of CO2 from carbon and oxygen gas is ...
AIPMT 2014
Which of the following statements is correct for the spontaneous adsorption of a gas?
AIPMT 2014
For the reaction, $${X_2}{O_{4\left( l \right)}}\,\, \to \,\,2X{O_{2(g)}}$$ $$\Delta $$U = 2.1 kcal, $$\Delta $$S = 20 cal K$$-$$1 at 300 K Hence, G ...
NEET 2013 (Karnataka)
When 5 litres of a gas mixture of methane and propane is perfectly combusted at 0oC and 1 atmosphere, 16 litres of oxygen at the same temperature and ...
NEET 2013 (Karnataka)
Three thermochemical equations are given below (i)  C(graphite) + O2(g) $$ \to $$ CO2(g); $$\Delta $$rHo = x kJ mol$$-$$1 (ii...
NEET 2013
A reaction having equal energies of activation for forward and reverse reactions has
AIPMT 2012 Prelims
In which of the following reactions, standard reaction entropy change ($$\Delta $$So) is positive and standard Gibb's energy change ($$\Delta $$Go) de...
AIPMT 2012 Prelims
Standard enthalpy of vaporisation $$\Delta $$vapHo for water at 100oC is 40.66 kJ mol$$-$$1. The internal energy of vaporisation of water at 100oC (in...
AIPMT 2012 Prelims
The enthalpy of fusion of water is 1.435 kcal/mol. The molar entropy change for the melting of ice at 0oC is
AIPMT 2011 Mains
Consider the following processes : .tg {border-collapse:collapse;border-spacing:0;border:none;} .tg td{font-family:Arial, sans-serif;font-size:14px;...
AIPMT 2011 Prelims
If the enthalpy change for the transition of liquid water to steam is 30 kJ mol$$-$$1 at 27oC, the entropy change for the process would be ...
AIPMT 2011 Prelims
Enthalpy change for the reaction, 4H(g)  $$ \to $$  2H2(g) is $$-$$869.6 kJ The dissociation energy of H $$-$$ H bond is ...
AIPMT 2011 Prelims
Which of the following is correct option for free expansion of an ideal gas under adiabatic condition ?
AIPMT 2010 Mains
Match List I (Equations) with List II (Type of processes) and select the correct option. .tg {border-collapse:collapse;border-spacing:0;border:none...
AIPMT 2010 Mains
Three moles of an ideal gas expanded spontaneously into vacuum. The work done will be
AIPMT 2010 Mains
For vaporization of water at 1 atmospheric pressure, the values of $$\Delta $$H and $$\Delta $$S are 40.63 kJ mol$$-$$1 and 108.8 J K$$-$$1 mol$$-$$1,...
AIPMT 2010 Mains
The following two reactions are known Fe2O3(s) + 3CO(g) $$ \to $$ 2Fe(s) + 3CO2(g); $$\Delta $$H = $$-$$ 26.8 kJ FeO(s) + CO(g) $$ \to $$ &nb...
AIPMT 2010 Prelims
For an endothermic reaction, energy of activation is Ea and enthalpy of reaction is $$\Delta $$H (both of these in kJ/mol). Minimum value of Ea will b...
AIPMT 2010 Prelims
Standard entropies of X2, Y2 and XY3 are 60, 40 and 50 J K$$-$$1 mol$$-$$1 respectively. For the reaction 1/2X2 + 3/2Y2 $$\rightleftharpoons$$ XY3, ...
AIPMT 2009
The values of $$\Delta $$H and $$\Delta $$S for the reaction, C(graphite) + CO2(g) $$ \to $$  2CO(g) are 170 kJ and 170 J K$$-$$1, respect...
AIPMT 2009
From the following bond energies : H $$-$$ H bond energy   : 431.37 kJ mol$$-$$1 C $$=$$ C bond energy   : 60...
AIPMT 2008
Which of the following are not state functions ? (I) q + w     (II) q (III) w     &n...
AIPMT 2008
For the gas phase reaction, PCl5(g)  $$\rightleftharpoons$$ PCl3(g) + Cl2(g) which of the following conditions are correct ? ...
AIPMT 2008
Bond dissociation enthalpy of H2, Cl2 and HCl are 434, 242 and 431 kJ mol$$-$$1 respectively. Enthalpy of formation of HCl is ...
AIPMT 2007
Consider the following reactions : (i) H+(aq) + OH$$-$$(aq) = H2O(l),  $$\Delta $$H = $$-$$ X1 kJ mol$$-$$1 (ii) H2(g) + 1/2O2(g)...
AIPMT 2007
Given that bond energies of H $$-$$ H and Cl $$-$$ Cl are 430 kJ mol$$-$$1 and 240 kJ mol$$-$$1 respectively and $$\Delta $$Hf for HCl is $$-$$ 90 kJ ...
AIPMT 2006
Identify the correct statement for change of Gibb's energy for a system ($$\Delta $$Gsystem) at constant temperature and pressure.
AIPMT 2006
The enthalpy and entropy change for the reaction: Br2(l) + Cl2(g) $$ \to $$ 2BrCl(g) are 30 kJ mol$$-$$1 and 105 J K$$-$$1 mol$$-$$1 respectively. ...
AIPMT 2006
The enthalpy of hydrogenation of cyclohexene is is $$-$$ 119.5 kJ mol$$-$$1. If resonance energy of benzene is $$-$$ 150.4 kJ mol$$-$$1, its enthalpy ...
AIPMT 2006
Assume each reaction is carried out in an open container. For which reaction will $$\Delta $$H = $$\Delta $$E ?
AIPMT 2005
Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction ?
AIPMT 2005
A reaction occurs spontaneously if
AIPMT 2005
The absolute enthalpy of neutralisation of the reaction : Mg(O)(s) + 2HCl(aq) $$ \to $$ MgCl2(aq) + H2O(l) will be ...
AIPMT 2004
If the bond energies of H $$-$$ H, Br $$-$$ Br, and H $$-$$ Br are 433, 192 and 364 kJ mol$$-$$1 respectively, the $$\Delta $$Ho for the reaction H2(g...
AIPMT 2004
Standard enthalpy and standard entropy changes for the oxidation of ammonia at 298 K are $$-$$ 382.64 kJ mol$$-$$1 and $$-$$ 145.6 kJ mol$$-$$1, respe...
AIPMT 2004
Considering entropy (S) as a thermodynamic parameter, the criterion for the spontaneity of any process is
AIPMT 2004
The work done during the expansion of a gas from a volume of 4 dm3 to 6 dm3 against a constant external pressure of 3 atm is (1 L atm = 101.32 J)...
AIPMT 2003
For the reaction, C3H8(g) + 5O2(g) $$ \to $$ 3CO2(g) + 4H2O(l) at constant temperature, $$\Delta $$H $$-$$ $$\Delta $$E is ...
AIPMT 2003
The densities of graphite and diamond at 298 K are 2.25 and 3.31 g cm$$-$$3, respectively. If the standard free energy difference $$\left( {\Delta {G^...
AIPMT 2003
For which one of the following equations is $$\Delta $$Horeact equal to $$\Delta $$Hof for the product ?
AIPMT 2003
Formation of solution from two components can be considered as (i) Pure solvent $$ \to $$ separated solvent molecules, $$\Delta $$H1 (ii)&n...
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 100 g of water which is free t...
AIPMT 2003
What is the entropy change (in J K$$-$$1 mol$$-$$1) when one mole of ice is converted into water at 0oC? (The enthalpy change for the conversion of ic...
AIPMT 2002
Unit of entropy is
AIPMT 2002
Which reaction is not feasible?
AIPMT 2002
In a closed insulated container a liquid is stirred with a paddle to increase the temperature which of the following is true ?
AIPMT 2002
Heat of combustion $$\Delta $$Ho for C(s), H2(g) and CH4(g) are $$-$$ 94, $$-$$ 68 and $$-$$213 kcal/mol, then $$\Delta $$Ho for C(s) + 2H2(g) $$ \to ...
AIPMT 2002
2 mole of ideal gas at 27oC temperature is expanded reversibly from 2 lit. to 20 lit. Find entropy change. (R = 2 cal/mol K)
AIPMT 2001
Change in enthalpy for reaction, 2H2O2(l) $$ \to $$ 2H2O(l) + O2(g) if heat of formation of H2O2(l) and H2O(l) are $$-$$188 and - 286 kJ/mol res...
AIPMT 2001
When 1 mol of gas is heated at constant volume temperature is raised from 298 to 308 K. Heat supplied to the gas is 500 J. Then which statement is cor...
AIPMT 2001
PbO2  $$ \to $$ PbO; $$\Delta $$G298 < 0 SnO2 $$ \to $$ SnO;  $$\Delta $$G298 > 0 Most probable oxidation state of Pb and Sn will...
AIPMT 2001
Enthalpy of CH4 + $${1 \over 2}$$ O2 $$ \to $$ CH3OH is negative. If enthalpy of combustion of CH4 and CH3OH are x and y respectively. Then which rela...
AIPMT 2000
2Zn + O2 $$ \to $$ 2ZnO;  $$\Delta $$Go = $$-$$ 616 J 2Zn + S2 $$ \to $$ 2ZnS;  $$\Delta $$Go = $$-$$ 293 J S2 + 2O2 $$ \to $$ 2SO...
AIPMT 2000
The entropy change in the fusion of one mole of a solid melting at 27oC (latent heat of fusion is 2930 J mol–1) is :
AIPMT 2000
For the reaction, C2H5OH(l) + 3O2(g) $$ \to $$ 2CO2(g) + 3H2O(l) which one is true...

MCQ (More than One Correct Answer)

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