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JEE Main 2024 (Online) 1st February Evening Shift
For a certain reaction at $300 \mathrm{~K}, \mathrm{~K}=10$, then $\Delta \mathrm{G}^{\circ}$ for the same reaction is - ____________ $\times 10^{-1} ...
JEE Main 2024 (Online) 31st January Evening Shift
If 5 moles of an ideal gas expands from $$10 \mathrm{~L}$$ to a volume of $$100 \mathrm{~L}$$ at $$300 \mathrm{~K}$$ under isothermal and reversible c...
JEE Main 2024 (Online) 31st January Morning Shift
Consider the following reaction at $$298 \mathrm{~K} \cdot \frac{3}{2} \mathrm{O}_{2(g)} \rightleftharpoons \mathrm{O}_{3(g)} \cdot \mathrm{K}_{\mathr...
JEE Main 2024 (Online) 30th January Evening Shift
Two reactions are given below: $$\begin{aligned} & 2 \mathrm{Fe}_{(\mathrm{s})}+\frac{3}{2} \mathrm{O}_{2(\mathrm{~g})} \rightarrow \mathrm{Fe}_2 \mat...
JEE Main 2024 (Online) 30th January Morning Shift
An ideal gas undergoes a cyclic transformation starting from the point A and coming back to the same point by tracing the path $$\mathrm{A} \rightarr...
JEE Main 2024 (Online) 29th January Evening Shift
Standard enthalpy of vapourisation for $$\mathrm{CCl}_4$$ is $$30.5 \mathrm{~kJ} \mathrm{~mol}^{-1}$$. Heat required for vapourisation of $$284 \mathr...
JEE Main 2024 (Online) 27th January Evening Shift
For a certain thermochemical reaction $$\mathrm{M} \rightarrow \mathrm{N}$$ at $$\mathrm{T}=400 \mathrm{~K}, \Delta \mathrm{H}^{\ominus}=77.2 \mathrm{...
JEE Main 2024 (Online) 27th January Morning Shift
If three moles of an ideal gas at $$300 \mathrm{~K}$$ expand isothermally from $$30 \mathrm{~dm}^3$$ to $$45 \mathrm{~dm}^3$$ against a constant oppos...
JEE Main 2023 (Online) 15th April Morning Shift
$30.4 \mathrm{~kJ}$ of heat is required to melt one mole of sodium chloride and the entropy change at the melting point is $28.4 \mathrm{~J} \mathrm{~...
JEE Main 2023 (Online) 13th April Morning Shift
$$\mathrm{A}_{2}+\mathrm{B}_{2} \rightarrow 2 \mathrm{AB} . \Delta H_{f}^{0}=-200 \mathrm{~kJ} \mathrm{~mol}^{-1}$$ $$\mathrm{AB}, \mathrm{A}_{2}$$ an...
JEE Main 2023 (Online) 12th April Morning Shift
One mole of an ideal gas at $$350 \mathrm{~K}$$ is in a $$2.0 \mathrm{~L}$$ vessel of thermally conducting walls, which are in contact with the surrou...
JEE Main 2023 (Online) 11th April Evening Shift
The total number of intensive properties from the following is __________ Volume, Molar heat capacity, Molarity, $$\mathrm{E}^{\theta}$$ cell, Gibbs f...
JEE Main 2023 (Online) 11th April Morning Shift
Solid fuel used in rocket is a mixture of $$\mathrm{Fe}_{2} \mathrm{O}_{3}$$ and $$\mathrm{Al}$$ (in ratio 1 : 2). The heat evolved $$(\mathrm{kJ})$$ ...
JEE Main 2023 (Online) 10th April Evening Shift
The number of endothermic process/es from the following is ______________. A. $$\mathrm{I}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{I}(\mathrm{g})$$ B. ...
JEE Main 2023 (Online) 8th April Evening Shift
For complete combustion of ethene. $$\mathrm{C}_{2} \mathrm{H}_{4}(\mathrm{g})+3 \mathrm{O}_{2}(\mathrm{g}) \rightarrow 2 \mathrm{CO}_{2}(\mathrm{g})+...
JEE Main 2023 (Online) 8th April Morning Shift
When a $$60 \mathrm{~W}$$ electric heater is immersed in a gas for 100 s in a constant volume container with adiabatic walls, the temperature of the g...
JEE Main 2023 (Online) 6th April Evening Shift
Consider the following data Heat of combustion of $$\mathrm{H}_{2}(\mathrm{g})\quad\quad=-241.8 \mathrm{~kJ} \mathrm{~mol}^{-1}$$ Heat of combustion o...
JEE Main 2023 (Online) 6th April Morning Shift
Consider the graph of Gibbs free energy G vs Extent of reaction. The number of statement/s from the following which are true with respect to points (a...
JEE Main 2023 (Online) 6th April Morning Shift
The value of $$\log \mathrm{K}$$ for the reaction $$\mathrm{A} \rightleftharpoons \mathrm{B}$$ at $$298 \mathrm{~K}$$ is ___________. (Nearest integer...
JEE Main 2023 (Online) 1st February Evening Shift
$$0.3 \mathrm{~g}$$ of ethane undergoes combustion at $$27^{\circ} \mathrm{C}$$ in a bomb calorimeter. The temperature of calorimeter system (includin...
JEE Main 2023 (Online) 1st February Morning Shift
At $$25^{\circ} \mathrm{C}$$, the enthalpy of the following processes are given : .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-col...
JEE Main 2023 (Online) 31st January Evening Shift
Enthalpies of formation of $\mathrm{CCl}_{4}(\mathrm{~g}), \mathrm{H}_{2} \mathrm{O}(\mathrm{g}), \mathrm{CO}_{2}(\mathrm{~g})$ and $\mathrm{HCl}(\mat...
JEE Main 2023 (Online) 31st January Morning Shift
The enthalpy change for the conversion of $$\frac{1}{2} \mathrm{Cl}_{2}(\mathrm{~g})$$ to $$\mathrm{Cl}^{-}$$(aq) is ($$-$$) ___________ $$\mathrm{kJ...
JEE Main 2023 (Online) 30th January Evening Shift
1 mole of ideal gas is allowed to expand reversibly and adiabatically from a temperature of $27^{\circ} \mathrm{C}$. The work done is $3 \mathrm{~kJ} ...
JEE Main 2023 (Online) 30th January Morning Shift
When 2 litre of ideal gas expands isothermally into vacuum to a total volume of 6 litre, the change in internal energy is ____________ J. (Nearest int...
JEE Main 2023 (Online) 25th January Evening Shift
28.0 L of CO$$_2$$ is produced on complete combustion of 16.8 L gaseous mixture of ethene and methane at 25$$^\circ$$C and 1 atm. Heat evolved during ...
JEE Main 2023 (Online) 25th January Morning Shift
An athlete is given 100 g of glucose (C$$_6$$H$$_{12}$$O$$_6$$) for energy. This is equivalent to 1800kJ of energy. The 50% of this energy gained is u...
JEE Main 2023 (Online) 24th January Evening Shift
One mole of an ideal monoatomic gas is subjected to changes as shown in the graph. The magnitude of the work done (by the system or on the system) is ...
JEE Main 2023 (Online) 24th January Evening Shift
Following figure shows spectrum of an ideal black body at four different temperatures. The number of correct statement/s from the following is _______...
JEE Main 2023 (Online) 24th January Morning Shift
For independent process at 300 K .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font...
JEE Main 2022 (Online) 29th July Morning Shift
When 600 mL of 0.2 M HNO3 is mixed with $$400 \mathrm{~mL}$$ of 0.1 M NaOH solution in a flask, the rise in temperature of the flask is ___________ $$...
JEE Main 2022 (Online) 28th July Evening Shift
Among the following the number of state variables is ______________. Internal energy (U) Volume (V) Heat (q) Enthalpy (H)...
JEE Main 2022 (Online) 27th July Evening Shift
A gas (Molar mass = 280 $$\mathrm{~g} \mathrm{~mol}^{-1}$$) was burnt in excess $$\mathrm{O}_{2}$$ in a constant volume calorimeter and during combust...
JEE Main 2022 (Online) 27th July Morning Shift
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 en...
JEE Main 2022 (Online) 26th July Evening Shift
For the reaction $$\mathrm{H}_{2} \mathrm{F}_{2}(\mathrm{~g}) \rightarrow \mathrm{H}_{2}(\mathrm{~g})+\mathrm{F}_{2}(\mathrm{~g})$$ $$\Delta U=-59.6 \...
JEE Main 2022 (Online) 26th July Morning Shift
$$2.4 \mathrm{~g}$$ coal is burnt in a bomb calorimeter in excess of oxygen at $$298 \mathrm{~K}$$ and $$1 \mathrm{~atm}$$ pressure. The temperature o...
JEE Main 2022 (Online) 25th July Evening Shift
While performing a thermodynamics experiment, a student made the following observations. HCl + NaOH $$\to$$ NaCl + H2O $$\Delta$$H = $$-$$57.3 kJ mol$...
JEE Main 2022 (Online) 25th July Morning Shift
The enthalpy of combustion of propane, graphite and dihydrogen at $$298 \mathrm{~K}$$ are $$-2220.0 \mathrm{~kJ} \mathrm{~mol}^{-1},-393.5 \mathrm{~kJ...
JEE Main 2022 (Online) 30th June Morning Shift
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 fr...
JEE Main 2022 (Online) 29th June Evening Shift
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...
JEE Main 2022 (Online) 29th June Morning Shift
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 entha...
JEE Main 2022 (Online) 28th June Evening Shift
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 magn...
JEE Main 2022 (Online) 28th June Morning Shift
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 ...
JEE Main 2022 (Online) 27th June Evening Shift
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 __________...
JEE Main 2022 (Online) 26th June Evening Shift
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 10...
JEE Main 2022 (Online) 26th June Morning Shift
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 calorimet...
JEE Main 2022 (Online) 25th June Morning Shift
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 ...
JEE Main 2021 (Online) 1st September Evening Shift
For the reaction, 2NO2(g) $$\rightleftharpoons$$ N2O4(g), when $$\Delta$$S = $$-$$176.0 JK$$-$$1 and $$\Delta$$H = $$-$$57.8 kJ mol$$-$$1, the magnitu...
JEE Main 2021 (Online) 27th August Evening Shift
Two flasks I and II shown below are connected by a valve of negligible volume.When the valve is opened, the final pressure of the system in bar is x $...
JEE Main 2021 (Online) 27th August Evening Shift
Data given for the following reaction is as follows :FeO(s) + C(graphite) $$\to$$ Fe(s) + CO(g) .tg {border-collapse:collapse;border-spacing:0;} .tg ...
JEE Main 2021 (Online) 27th August Morning Shift
200 mL of 0.2 M HCl is mixed with 300 mL of 0.1 M NaOH. The molar heat of neutralization of this reaction is $$-$$57.1 kJ. The increase in temperature...
JEE Main 2021 (Online) 26th August Evening Shift
For water $$\Delta$$vap H = 41 kJ mol$$-$$1 at 373 K and 1 bar pressure. Assuming that water vapour is an ideal gas that occupies a much larger volume...
JEE Main 2021 (Online) 26th August Morning Shift
The Born-Haber cycle for KCl is evaluated with the following data :$${\Delta _f}{H^\Theta }$$ for KCl = $$-$$436.7 kJ mol$$-$$1 ;$${\Delta _{sub}}{H^\...
JEE Main 2021 (Online) 27th July Evening Shift
When 400 mL of 0.2 M H2SO4 solution is mixed with 600 mL of 0.1 M NaOH solution, the increase in temperature of the final solution is __________ $$\ti...
JEE Main 2021 (Online) 27th July Morning Shift
For water at 100$$^\circ$$ C and 1 bar,$$\Delta$$vap H $$-$$ $$\Delta$$vap U = _____________ $$\times$$ 102 J mol$$-$$1. (Round off to the Nearest Int...
JEE Main 2021 (Online) 25th July Evening Shift
A system does 200 J of work and at the same time absorbs 150 J of heat. The magnitude of the change in internal energy is ____________ J. (Nearest int...
JEE Main 2021 (Online) 25th July Morning Shift
At 298 K, the enthalpy of fusion of a solid (X) is 2.8 kJ mol$$-$$1 and the enthalpy of vaporisation of the liquid (X) is 98.2 kJ mol$$-$$1. The entha...
JEE Main 2021 (Online) 22th July Evening Shift
If the standard molar enthalpy change for combustion of graphite powder is $$-$$2.48 $$\times$$ 102 kJ mol$$-$$1, the amount of heat generated on comb...
JEE Main 2021 (Online) 20th July Evening Shift
For a given chemical reaction A $$\to$$ B at 300 K the free energy change is $$-$$49.4 kJ mol$$-$$1 and the enthalpy of reaction is 51.4 kJ mol$$-$$1....
JEE Main 2021 (Online) 18th March Morning Shift
For the reaction C2H6 $$ \to $$ C2H4 + H2the reaction enthalpy $$\Delta$$rH = __________ kJ mol$$-$$1. (Round off to the Nearest Integer).[ Given : Bo...
JEE Main 2021 (Online) 17th March Morning Shift
The standard enthalpies of formation of Al2O3 and CaO are $$-$$1675 kJ mol-1 and $$-$$635 kJ mol$$-$$1 respectively.For the reaction3CaO + 2Al $$ \to ...
JEE Main 2021 (Online) 16th March Evening Shift
At 25$$^\circ$$C, 50 g of iron reacts with HCl to form FeCl2. The evolved hydrogen gas expands against a constant pressure of 1 bar. The work done by ...
JEE Main 2021 (Online) 26th February Evening Shift
The average S-F bond energy in kJ mol$$-$$1 of SF6 is _____________. (Rounded off to the nearest integer)[Given : The values of standard enthalpy of f...
JEE Main 2021 (Online) 26th February Morning Shift
For a chemical reaction A + B ⇌ C + D($${\Delta _r}{H^\Theta }$$ = 80 kJ mol$$-$$1) the entropy change $${\Delta _r}{S^\Theta }$$ depends on the tempe...
JEE Main 2021 (Online) 26th February Morning Shift
An exothermic reaction X $$ \to $$ Y has an activation energy 30 kJ mol$$-$$1. If energy change $$\Delta$$E during the reaction is $$-$$20 kJ, then th...
JEE Main 2021 (Online) 25th February Evening Shift
Five moles of an ideal gas at 293 K is expanded isothermally from an initial pressure of 2.1 MPa to 1.3 MPa against at constant external pressure 4.3 ...
JEE Main 2021 (Online) 25th February Morning Shift
The reaction of cyanamide, NH2CN(s) with oxygen was run in a bomb calorimeter and $$\Delta$$U was found to be $$-$$742.24 kJ mol$$-$$1. The magnitude ...
JEE Main 2021 (Online) 25th February Morning Shift
The ionization enthalpy of Na+ formation from Na(g) is 495.8 kJ mol$$-$$1, while the electron gain enthalpy of Br is $$-$$325.0 kJ mol$$-$$1. Given th...
JEE Main 2021 (Online) 24th February Evening Shift
Assuming ideal behaviour, the magnitude of log K for the following reaction at 25$$^\circ$$C is x $$\times$$ 10$$-$$1. The value of x is _____________...
JEE Main 2020 (Online) 5th September Evening Slot
For a dimerization reaction, 2A(g) $$ \to $$ A2(g) at 298 K, $$\Delta $$Uo = –20 kJ mol–1, $$\Delta $$So = –30 JK–1 mol–1, then the $$\Delta $$Go w...
JEE Main 2020 (Online) 2nd September Evening Slot
The heat of combustion of ethanol into carbon dioxide and water is – 327 kcal at constant pressure. The heat evolved (in cal) at constant volume and 2...
JEE Main 2020 (Online) 2nd September Morning Slot
The internal energy change (in J) When 90 g of water undergoes complete evaporation at 100oC is ____________. (Given : $$\Delta $$Hvap for water at 37...
JEE Main 2020 (Online) 8th January Evening Slot
At constant volume, 4 mol of an ideal gas when heated from 300 K to 500K changes its internal energy by 5000 J. The molar heat capacity at constant vo...
JEE Main 2020 (Online) 8th January Morning Slot
The magnitude of work done by a gas that undergoes a reversible expansion along the path ABC shown in the figure is _______. ...
JEE Main 2020 (Online) 7th January Evening Slot
The standard heat of formation $$\left( {{\Delta _f}H_{298}^0} \right)$$ of ethane (in kj/mol), if the heat of combustion of ethane, hydrogen and grap...
JEE Main 2020 (Online) 7th January Morning Slot
For the reaction : A($$l$$) $$ \to $$ 2B(g) $$\Delta U = 2.1\,kcal,\,\Delta S = 20\,cal\,{K^{ - 1}}$$ at 300 K Hence $$\Delta $$G in kcal is :...

MCQ (Single Correct Answer)

JEE Main 2024 (Online) 1st February Morning Shift
Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following :
JEE Main 2024 (Online) 29th January Morning Shift
Which of the following is not correct?
JEE Main 2023 (Online) 13th April Evening Shift
What happens when methane undergoes combustion in systems A and B respectively? ...
JEE Main 2023 (Online) 10th April Morning Shift
Given .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;f...
JEE Main 2023 (Online) 29th January Evening Shift
Which of the following relations are correct? (A) $$\mathrm{\Delta U=q+p\Delta V}$$ (B) $$\mathrm{\Delta G=\Delta H-T\Delta S}$$ (C) $$\Delta \mathrm{...
JEE Main 2022 (Online) 28th July Evening Shift
Given below are two statements: One is labelled as Assertion $$\mathbf{A}$$ and the other is labelled as Reason $$\mathbf{R}$$ Assertion A : The reduc...
JEE Main 2022 (Online) 28th July Morning Shift
Which of the following relation is not correct?
JEE Main 2022 (Online) 30th June Morning Shift
$$\Delta$$G$$^\circ$$ vs T plot for the formation of MgO, involving reaction 2Mg + O2 $$\to$$ 2MgO, will look like :
JEE Main 2022 (Online) 27th June Morning Shift
Match List-I with List-II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-famil...
JEE Main 2022 (Online) 25th June Evening Shift
At 25$$^\circ$$C and 1 atm pressure, the enthalpy of combustion of benzene (I) and acetylene (g) are $$-$$ 3268 kJ mol$$-$$1 and $$-$$1300 kJ mol$$-$$...
JEE Main 2022 (Online) 24th June Evening Shift
At 25$$^\circ$$C and 1 atm pressure, the enthalpies of combustion are as given below : .tg {border-collapse:collapse;border-spacing:0;} .tg td{borde...
JEE Main 2021 (Online) 31st August Evening Shift
The incorrect expression among the following is :
JEE Main 2021 (Online) 17th March Evening Shift
During which of the following processes, does entropy decrease?(A) Freezing of water to ice at 0$$^\circ$$C(B) Freezing of water to ice at $$-$$10$$^\...
JEE Main 2020 (Online) 6th September Evening Slot
For a reaction, 4M(s) + nO2(g) $$ \to $$ 2M2On(s) the free energy change is plotted as a function of temperature. The temperature below which the oxid...
JEE Main 2020 (Online) 5th September Evening Slot
Lattice enthalpy and enthalpy of solution of NaCl are 788 kJ mol–1, and 4 kJ mol–1, respectively. The hydration enthalpy of NaCl is :...
JEE Main 2020 (Online) 4th September Evening Slot
The process that is NOT endothermic in nature is :
JEE Main 2020 (Online) 4th September Evening Slot
Five moles of an ideal gas at 1 bar and 298 K is expanded into vacuum to double the volume. The work done is :
JEE Main 2020 (Online) 4th September Morning Slot
For one mole of an ideal gas, which of these statements must be true? (a) U and H each depends only on temperature (b) Compressibility factor z is not...
JEE Main 2020 (Online) 9th January Evening Slot
The true statement amongst the following is :
JEE Main 2020 (Online) 9th January Morning Slot
If enthalpy of atomisation for Br2(1) is x kJ/mol and bond enthalpy for Br2 is y kJ/mol, the relation between them :
JEE Main 2019 (Online) 12th April Morning Slot
Enthalpy of sublimation of iodine is 24 cal g–1 at 200 oC. If specific heat of I2(s) and l2 (vap) are 0.055 and 0.031 cal g–1K –1 respectively, then ...
JEE Main 2019 (Online) 12th April Morning Slot
An ideal gas is allowed to expand form 1 L to 10 L against a constant external pressure of I bar. The work done in kJ is :
JEE Main 2019 (Online) 10th April Evening Slot
The difference between $$\Delta $$H and $$\Delta $$U ($$\Delta $$H – $$\Delta $$U), when the combustion of one mole of heptane(l) is carried out at a ...
JEE Main 2019 (Online) 10th April Morning Slot
A process will be spontaneous at all temperatures if :
JEE Main 2019 (Online) 9th April Evening Slot
During compression of a spring the work done is 10kJ and 2kJ escaped to the surroundings as heat. The change in internal energy, $$\Delta $$U(inkJ) is...
JEE Main 2019 (Online) 9th April Morning Slot
Among the following, the set of parameters that represents path function, is : (A) q + w (B) q (C) w (D) H–TS
JEE Main 2019 (Online) 8th April Evening Slot
5 moles of an ideal gas at 100 K are allowed to undergo reversible compression till its temperature becomes 200 K. If CV = 28 JK–1mol–1, calculate $$\...
JEE Main 2019 (Online) 8th April Morning Slot
For silver, Cp(J K–1 mol–1) = 23 +0.01 T. If the temperature (T) of 3 moles of silver is raised from 300 K to 1000 K at 1 atm pressure, the value of $...
JEE Main 2019 (Online) 8th April Morning Slot
Which one of the following equations does not correctly represent the first law of thermodynamics for the given processes involving an ideal gas? (Ass...
JEE Main 2019 (Online) 12th January Evening Slot
The combination of plots which does not represent isothermal expansion of an ideal gas is – ...
JEE Main 2019 (Online) 12th January Evening Slot
Given (i)  C (graphite) + O2(g) $$ \to $$ CO2(g); $$\Delta $$rH$$^\Theta $$ = x kJ mol$$-$$1 (ii)  C(graphite) + $${1 \over 2}$$O...
JEE Main 2019 (Online) 12th January Morning Slot
For diatomic ideal gas in a closed system, which of the following plots does not correctly describe the relation between various thermodynamic quantit...
JEE Main 2019 (Online) 11th January Evening Slot
For the equilibrium, 2H2O $$\rightleftharpoons$$ H3O+ + OH$$-$$, the value of $$\Delta $$Go at 298 K is approximately : ...
JEE Main 2019 (Online) 11th January Evening Slot
The reaction, MgO(s) + C(s) $$ \to $$ Mg(s) + CO(g), for which $$\Delta $$rHo + 491.1 kJ mol–1 and $$\Delta $$rSo = 198.0 JK–1 mol–1, is not feasible...
JEE Main 2019 (Online) 11th January Evening Slot
The standard reaction Gibbs energy for a chemical reaction at an absolute temperature T is given by $$\Delta $$rGo = A – BT Where A and B are non-zero...
JEE Main 2019 (Online) 11th January Morning Slot
For the chemical reaction X $$\rightleftharpoons$$ Y, the standard reaction Gibbs energy depends on temperature T (in K) as $$\Delta $$rGo (in kJ mo...
JEE Main 2019 (Online) 11th January Morning Slot
Two blocks of the same metal having same mass and at temperature T1 and T2, respectively, are brought in contact with each other and allowed to attain...
JEE Main 2019 (Online) 10th January Evening Slot
The process with negative entropy change is :
JEE Main 2019 (Online) 10th January Evening Slot
An ideal gas undergoes isothermal compression from 5m3 to 1 m3 against a constant external pressure of 4 Nm–2. Heat released in this process is used ...
JEE Main 2019 (Online) 10th January Morning Slot
A process has $$\Delta $$H = 200 J mol–1 and $$\Delta $$S = 40 JK–1 mol–1. Out of the values given below, choose the minimum temperature above which t...
JEE Main 2019 (Online) 9th January Evening Slot
The entropy change associated with the conversion of 1 kg of ice at 273 K to water vapours at 383 K is : (Specific heat of water liquid and water vap...
JEE Main 2019 (Online) 9th January Morning Slot
Consider the reversible isothermal expansion of an ideal gas in a closed system at two different temperatures T1 and T2 (T1 < T2). The correct grap...
JEE Main 2018 (Online) 16th April Morning Slot
At 320 K, a gas A2 is 20% dissociated to A(g). The standard free energy change at 320 K and 1 atm in J mol-1 is approximately : (R = 8.314 JK-1 mol-1;...
JEE Main 2018 (Online) 16th April Morning Slot
For which of the following processes, $$\Delta $$S is negative ?
JEE Main 2018 (Offline)
The combustion of benzene(l) gives CO2(g) and H2O(l). Given that heat of combustion of benzene at constant volume is –3263.9 kJ mol–1 at 25oC; heat of...
JEE Main 2018 (Offline)
Which of the following lines correctly show the temperature dependence of equilibrium constant K, for an exothermic reaction? ...
JEE Main 2018 (Online) 15th April Evening Slot
Given (i)   2Fe2O3(s) $$ \to $$ 4Fe(s) + 3O2(g); $$\Delta $$rGo = + 1487.0 kJ mol-1 (ii)   2CO(g) + O2(g) $$ \to $$ 2CO2(g); $$\...
JEE Main 2018 (Online) 15th April Evening Slot
$$\Delta $$fGo at 500 K for substance 'S' in liquid state and gaseous state are +100.7 kcl mol-1 and +103 kcal mol-1, respectively. Vapour pressure of...
JEE Main 2018 (Online) 15th April Morning Slot
For which of the following reactions, $$\Delta $$H is equal to $$\Delta $$U?
JEE Main 2018 (Online) 15th April Morning Slot
An ideal gas undergoes a cyclic process as shown in Figure. $$\Delta $$UBC = $$-$$5 kJ mol-1, qAB = $$2$$ kJ mol-1, WAB = $$-$$5 kJ mol-1, WCA = 3 kJ ...
JEE Main 2017 (Online) 9th April Morning Slot
An ideal gas undergoes isothermal expansion at constant pressure. During the process :
JEE Main 2017 (Online) 9th April Morning Slot
A gas undergoes change from state A to state B. In this process, the heat absorbed and work done by the gas is 5 J and 8 J, respectively. Now gas is b...
JEE Main 2017 (Online) 8th April Morning Slot
For a reaction, A(g) $$ \to $$ A($$\ell $$); $$\Delta $$H= $$-$$ 3RT. The correct statement for the reaction is :
JEE Main 2017 (Online) 8th April Morning Slot
The enthalpy change on freezing of 1 mol of water at 5oC to ice at −5oC is : (Given $$\Delta $$fusH = 6 kJ mol$$-$$1 at 0oC, Cp(H2O, $$\ell $$ = 75.3...
JEE Main 2017 (Offline)
$$\Delta $$U is equal to :
JEE Main 2017 (Offline)
Given, $${C_{(graphite)}} + {O_2} \to C{O_2}(g)$$; $${\Delta _r}{H^o}$$ = - 393.5 kJ mol-1 $${{\rm H}_2}(g)$$ + $${1 \over 2}{O_2}(g)$$$$\to {{\rm H}_...
JEE Main 2016 (Online) 10th April Morning Slot
If 100 mole of H2O2 decompose at 1 bar and 300 K, the work done (kJ) by one mole of O2(g) as it expands against 1 bar pressure is : 2H2O2(l)  &nb...
JEE Main 2016 (Online) 9th April Morning Slot
For the reaction, A(g) + B(g) $$ \to $$ C(g) + D(g), $$\Delta $$Ho and $$\Delta $$So are, respectively, − 29.8 kJ mol−1 and −0.100 kJ K−1 mol−1 at 2...
JEE Main 2016 (Online) 9th April Morning Slot
A reaction at 1 bar is non-spontaneous at low temperature but becomes spontaneous at high temperature. Identify the correct statement about the reacti...
JEE Main 2016 (Online) 9th April Morning Slot
The plot shows the variation of −$$ln$$ Kp versus temperature for the two reactions. M(s) + $${1 \over 2}$$ O2(g) $$ \to $$ MO(s) and C(s) + $${1 \ov...
JEE Main 2016 (Offline)
The heats of combustion of carbon and carbon monoxide are –393.5 and –283.5 kJ mol–1, respectively. The heat of formation (in kJ) of carbon monoxide p...
JEE Main 2015 (Offline)
The following reaction is performed at 298 K 2NO(g) + O2 (g) $$\leftrightharpoons$$ 2NO2 (g) The standard free energy of formation of NO(g) is 86.6 ...
JEE Main 2014 (Offline)
For complete combustion of ethanol, C2H5OH(l) + 3O2(g) $$\to$$ 2CO2(g) + 3H2O(l) the amount of heat produced as measured in bomb calorimeter, is 1364...
JEE Main 2013 (Offline)
A piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 37.0oC. As it does so, it absorbs...
AIEEE 2012
The incorrect expression among the following is :
AIEEE 2011
The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas from a volume of 10 dm3 to a volume of 100 dm3 at 27oC i...
AIEEE 2010
The standard enthalpy of formation of NH3 is –46.0 kJ mol–1. If the enthalpy of formation of H2 from its atoms is –436 kJ mol–1 and that of N2 is –712...
AIEEE 2010
For a particular reversible reaction at temperature T, ∆H and ∆S were found to be both +ve. If Te is the temperature at equilibrium, the reaction woul...
AIEEE 2009
On the basis of the following thermochemical data : ($$\Delta _fG^oH^+_{(aq)}$$ = 0) H2O(l) $$\to$$ H+(aq) + OH-(aq); $$\Delta H$$ = 57.32 kJ H2(g) +...
AIEEE 2008
Oxidising power of chlorine in aqueous solution can be determined by the parameters indicated below: $${1 \over 2}C{l_2}(g)$$ $$\buildrel {{1 \over 2...
AIEEE 2008
Standard entropy of X2, Y2 and XY3 are 60, 40 and 50 JK−1 mol−1 , respectively. For the reaction, $${1 \over 2} X_2$$ + $${3 \over 2} Y_2 \to$$ XY3,...
AIEEE 2007
In conversion of lime-stone to lime, CaCO3(s) $$\to$$ CaO(s) + CO2 (g) the vales of ∆H° and ∆S° are +179.1 kJ mol−1 and 160.2 J/K respectively at 29...
AIEEE 2007
Identify the correct statement regarding a spontaneous process :
AIEEE 2007
Assuming that water vapour is an ideal gas, the internal energy change $$\left( {\Delta U} \right)$$ when $$1$$ mol of water is vapourised at $$1$$ ba...
AIEEE 2006
An ideal gas is allowed to expand both reversibly and irreversibly in an isolated system. If Ti is the initial temperature and Tf is the final tempera...
AIEEE 2006
The enthalpy changes for the following processes are listed below : Cl2(g) = 2Cl(g), 242.3 kJ mol–1 I2(g) = 2I(g), 151.0 kJ mol–1 ICl(g) = I(g) + C...
AIEEE 2006
The standard enthalpy of formation $$\Delta _fH^o$$ at 298 K for methane, CH4(g), is –74.8 kJ mol–1. The additional information required to determine ...
AIEEE 2006
($$\Delta H - \Delta U$$) for the formation of carbon monoxide (CO) from its elements at 298 K is : (R = 8.314 J K–1 mol–1)
AIEEE 2005
Consider the reaction: N2 + 3H2 $$\to$$ 2NH3 carried out at constant temperature and pressure. If $$\Delta H$$ and $$\Delta U$$ are the enthalpy and i...
AIEEE 2005
If the bond dissociation energies of XY, X2 and Y2 (all diatomic molecules) are in the ratio of 1:1:0.5 and $$\Delta H_f$$ for the formation of XY is ...
AIEEE 2005
Consider an endothermic reaction, X $$\to$$ Y with the activation energies Eb and Ef for the backward and forward reactions, respectively. In general ...
AIEEE 2004
An ideal gas expands in volume from 1$$\times$$10-3 m3 to 1 $$\times$$ 10-2 m3 at 300 K against a constant pressure of 1$$\times$$105 Nm-2. The work d...
AIEEE 2004
The enthalpies of combustion of carbon and carbon monoxide are -393.5 and -283 kJ mol-1 respectively. The enthalpy of formation of carbon monoxide per...
AIEEE 2003
The internal energy change when a system goes from state A to B is 40 kJ/mole. If the system goes from A to B by a reversible path and returns to sta...
AIEEE 2003
In an irreversible process taking place at constant T and P and in which only pressure-volume work is being done, the change in Gibbs free energy (dG)...
AIEEE 2003
The enthalpy change for a reaction does not depend upon :
AIEEE 2003
The correct relationship between free energy change in a reaction and the corresponding equilibrium constant Kc is :
AIEEE 2003
If at 298 K the bond energies of C - H, C - C, C = C and H - H bonds are respectively 414, 347, 615 and 435 kJ/mol, the value of enthalpy change for t...
AIEEE 2002
If an endothermic reaction is non-spontaneous at freezing point of water and becomes feasible at its boiling point, then :
AIEEE 2002
For the reactions 2C + O2 $$\to$$ 2CO2; $$\Delta H$$ = -393 J 2Zn + O2 $$\to$$ 2ZnO; $$\Delta H$$ = -412 J
AIEEE 2002
The heat required to raise the temperature of body by 1 K is called :
AIEEE 2002
A heat engine absorbs heat Q1 at temperature T1 and heat Q2 at temperature T2. Work done by the engine is J (Q1 + Q2). This data :...
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