JEE MAIN · CHEMISTRY · THERMODYNAMICS
JEE Main Thermodynamics Questions & Solutions
110 solved questions on Thermodynamics, ranging from easy to JEE-Advanced-flavour hard. Click any to see the full solution.
110 solved questions on Thermodynamics, ranging from easy to JEE-Advanced-flavour hard. Click any to see the full solution.
At 298 K, the enthalpy of fusion of a solid (X) is 2.8 kJ mol$-$1 and the enthalpy of vaporisation of the liquid (X) is 98.2 kJ mol$-$1. The enthalpy of sublimation of the…
View solution →Five moles of an ideal gas at 293 K is expanded isothermally from an initial pressure of 2.1 MPa to 1.3 MPa against at constant external pressure 4.3 MPa. The heat transferred in…
View solution →At 25$^\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 the gas during this expansion…
View solution →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 gas rises by $5^{\circ}…
View solution →Assuming ideal behaviour, the magnitude of log K for the following reaction at 25$^\circ$C is x $\times$ 10$-$1. The value of x is ______________. (Integer answer) $3HC \equiv…
View solution →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…
View solution →The heat of combustion of solid benzoic acid at constant volume is $-321.30 \mathrm{~kJ}$ at $27^{\circ} \mathrm{C}$. The heat of combustion at constant pressure is $(-321.30-x…
View solution →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 combustion of 1 g of graphite powder is…
View solution →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 oxide is stable could be inferred…
View solution →The true statement amongst the following is :
View solution →If $\quad C$ (diamond $) \rightarrow C$ (graphite) $+X \mathrm{~kJ} \mathrm{~mol}^{-1}$ C (diamond) $+\mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{CO}_2(\mathrm{~g})+\mathrm{Y}…
View solution →When equal volume of $1 \mathrm{~M} \mathrm{~HCl}$ and $1 \mathrm{~M} \mathrm{~H}_2 \mathrm{SO}_4$ are separately neutralised by excess volume of $1 \mathrm{M}$ $\mathrm{NaOH}$…
View solution →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 27oC (if all gases behave…
View solution →The number of endothermic process/es from the following is ______________. A. $\mathrm{I}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{I}(\mathrm{g})$ B. $$\mathrm{HCl}(\mathrm{g})…
View solution →For complete combustion of ethene. $$\mathrm{C}_{2} \mathrm{H}_{4}(\mathrm{g})+3 \mathrm{O}_{2}(\mathrm{g}) \rightarrow 2 \mathrm{CO}_{2}(\mathrm{g})+2 \mathrm{H}_{2}…
View solution →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 utilized by the athlete for sports…
View solution →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.
View solution →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…
View solution →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…
View solution →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 integer)
View solution →Three moles of an ideal gas are compressed isothermally from $60 \mathrm{~L}$ to $20 \mathrm{~L}$ using constant pressure of $5 \mathrm{~atm}$. Heat exchange $\mathrm{Q}$ for the…
View solution →For a certain reaction at $300 \mathrm{~K}, \mathrm{~K}=10$, then $\Delta \mathrm{G}^{\circ}$ for the same reaction is - ____________ $\times 10^{-1} \mathrm{~kJ}…
View solution →$\Delta_{\text {vap }} \mathrm{H}^{\ominus}$ for water is $+40.79 \mathrm{~kJ} \mathrm{~mol}^{-1}$ at 1 bar and $100^{\circ} \mathrm{C}$. Change in internal energy for this…
View solution →Which of the following relation is not correct?
View solution →The heat of solution of anhydrous $\mathrm{CuSO}_4$ and $\mathrm{CuSO}_4 \cdot 5 \mathrm{H}_2 \mathrm{O}$ are $-70 \mathrm{~kJ} \mathrm{~mol}^{-1}$ and $+12 \mathrm{~kJ}…
View solution →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 than liquid water, the internal…
View solution →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 __________ $\times$ 10$-$2 K. (Round off to…
View solution →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 of…
View solution →For water at 100$^\circ$ C and 1 bar,$\Delta$vap H $-$ $\Delta$vap U = _____________ $\times$ 102 J mol$-$1. (Round off to the Nearest Integer)[Use : R = 8.31 J mol$-$1…
View solution →Combustion of 1 mole of benzene is expressed at $$\mathrm{C}_6 \mathrm{H}_6(\mathrm{l})+\frac{15}{2} \mathrm{O}_2(\mathrm{~g}) \rightarrow 6 \mathrm{CO}_2(\mathrm{~g})+3…
View solution →$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{~K}^{-1} \mathrm{~mol}^{-1}$…
View solution →500 J of energy is transferred as heat to 0.5 mol of Argon gas at 298 K and 1.00 atm. The final temperature and the change in internal energy respectively are: Given: R = 8.3 J…
View solution →Given below are two statements: Statement I : When a system containing ice in equilibrium with water (liquid) is heated, heat is absorbed by the system and there is no change in…
View solution →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-family:Arial,…
View solution →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…
View solution →An ideal gas, $\overline{\mathrm{C}}_{\mathrm{v}}=\frac{5}{2} \mathrm{R}$, is expanded adiabatically against a constant pressure of 1 atm untill it doubles in volume. If the…
View solution →At $25^{\circ} \mathrm{C}$, the enthalpy of the following processes are given : .tg {border-collapse:collapse;border-spacing:0;} .tg…
View solution →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 :
View solution →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 integer)
View solution →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 of $\Delta$H298 for the…
View solution →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…
View solution →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 surroundings. It undergoes isothermal…
View solution →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…
View solution →The enthalpy change for the conversion of $\frac{1}{2} \mathrm{Cl}_{2}(\mathrm{~g})$ to $\mathrm{Cl}^{-}$(aq) is ($-$) ___________ $\mathrm{kJ} \mathrm{mol}^{-1}$ (Nearest…
View solution →Which of the following is not correct?
View solution →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 the activation energy for the reverse…
View solution →Given .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px;…
View solution →Consider the given data : (a) $\mathrm{HCl}(\mathrm{g})+10 \mathrm{H}_2 \mathrm{O}(\mathrm{l}) \rightarrow \mathrm{HCl} .10 \mathrm{H}_2 \mathrm{O} \Delta \mathrm{H}=-69.01…
View solution →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…
View solution →$$\mathrm{A}_{2}+\mathrm{B}_{2} \rightarrow 2 \mathrm{AB} . \Delta H_{f}^{0}=-200 \mathrm{~kJ} \mathrm{~mol}^{-1}$$ $\mathrm{AB}, \mathrm{A}_{2}$ and $\mathrm{B}_{2}$ are diatomic…
View solution →Two reactions are given below: $$\begin{aligned} & 2 \mathrm{Fe}_{(\mathrm{s})}+\frac{3}{2} \mathrm{O}_{2(\mathrm{~g})} \rightarrow \mathrm{Fe}_2 \mathrm{O}_{3(\mathrm{~s})},…
View solution →For the reaction $$\mathrm{H}_{2} \mathrm{F}_{2}(\mathrm{~g}) \rightarrow \mathrm{H}_{2}(\mathrm{~g})+\mathrm{F}_{2}(\mathrm{~g})$$ $\Delta U=-59.6 \mathrm{~kJ}…
View solution →During which of the following processes, does entropy decrease?(A) Freezing of water to ice at 0$^\circ$C(B) Freezing of water to ice at $-$10$^\circ$C(C) N2(g) + 3H2(g) $\to$…
View solution →For a certain thermochemical reaction $\mathrm{M} \rightarrow \mathrm{N}$ at $$\mathrm{T}=400 \mathrm{~K}, \Delta \mathrm{H}^{\ominus}=77.2 \mathrm{~kJ} \mathrm{~mol}^{-1}, \Delta…
View solution →$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…
View solution →The total number of intensive properties from the following is __________ Volume, Molar heat capacity, Molarity, $\mathrm{E}^{\theta}$ cell, Gibbs free energy change, Molar mass,…
View solution →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…
View solution →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…
View solution →Standard enthalpy of vapourisation for $\mathrm{CCl}_4$ is $30.5 \mathrm{~kJ} \mathrm{~mol}^{-1}$. Heat required for vapourisation of $284 \mathrm{~g}$ of $\mathrm{CCl}_4$ at…
View solution →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 temperature T (in K) as ${\Delta…
View solution →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…
View solution →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 volume is _______.
View solution →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 opposing pressure of $80 \mathrm{~kPa}$,…
View solution →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. The entropy change of the reaction…
View solution →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…
View solution →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-family:Arial,…
View solution →The value of $\log \mathrm{K}$ for the reaction $\mathrm{A} \rightleftharpoons \mathrm{B}$ at $298 \mathrm{~K}$ is ___________. (Nearest integer) Given: $\Delta…
View solution →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 :
View solution →For the reaction at $$298 \mathrm{~K}, 2 \mathrm{~A}+\mathrm{B} \rightarrow \mathrm{C}, \Delta \mathrm{H}=400 \mathrm{~kJ} \mathrm{~mol}^{-1}$$ and $\Delta S=0.2 \mathrm{~kJ}…
View solution →200 mL of 0.2 M HCl is mixed with 300 mL of 0.1 M NaOH. The molar heat of neutralization of this reaction is $-$57.1 kJ. The increase in temperature in $^\circ$C of the system on…
View solution →One mole of an ideal gas expands isothermally and reversibly from $10 \mathrm{dm}^3$ to $20 \mathrm{dm}^3$ at 300 K . $\Delta \mathrm{U}, \mathrm{q}$ and work done in the process…
View solution →Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R) Assertion (A) : Enthalpy of neutralisation of strong monobasic acid with…
View solution →$0.3 \mathrm{~g}$ of ethane undergoes combustion at $27^{\circ} \mathrm{C}$ in a bomb calorimeter. The temperature of calorimeter system (including the water) is found to rise by…
View solution →At 25$^\circ$C and 1 atm pressure, the enthalpy of combustion of benzene (I) and acetylene (g) are $-$ 3268 kJ mol$-$1 and $-$1300 kJ mol$-$1, respectively. The change in enthalpy…
View solution →Consider the following reaction at $$298 \mathrm{~K} \cdot \frac{3}{2} \mathrm{O}_{2(g)} \rightleftharpoons \mathrm{O}_{3(g)} \cdot \mathrm{K}_{\mathrm{P}}=2.47 \times 10^{-29}$$.…
View solution →The standard heat of formation $\left( {{\Delta _f}H_{298}^0} \right)$ of ethane (in kj/mol), if the heat of combustion of ethane, hydrogen and graphite are - 1560, -393.5 and…
View solution →The incorrect expression among the following is :
View solution →Solid fuel used in rocket is a mixture of $\mathrm{Fe}_{2} \mathrm{O}_{3}$ and $\mathrm{Al}$ (in ratio 1 : 2). The heat evolved $(\mathrm{kJ})$ per gram of the mixture is…
View solution →For the reaction, 2NO2(g) $\rightleftharpoons$ N2O4(g), when $\Delta$S = $-$176.0 JK$-$1 and $\Delta$H = $-$57.8 kJ mol$-$1, the magnitude of $\Delta$G at 298 K for the reaction…
View solution →The Born-Haber cycle for KCl is evaluated with the following data :${\Delta _f}{H^\Theta }$ for KCl = $-$436.7 kJ mol$-$1 ;${\Delta _{sub}}{H^\Theta }$ for K = 89.2 kJ mol$-$1…
View solution →When $\Delta \mathrm{H}_{\mathrm{vap}}=30 \mathrm{~kJ} / \mathrm{mol}$ and $$\Delta \mathrm{S}_{\mathrm{vap}}=75 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}$$, then the…
View solution →The enthalpy of formation of ethane $(\mathrm{C}_2 \mathrm{H}_6)$ from ethylene by addition of hydrogen where the bond-energies of $$\mathrm{C}-\mathrm{H}, \mathrm{C}-\mathrm{C},…
View solution →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…
View solution →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 will be _____ J.
View solution →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) $\Delta \mathrm{S}=\frac{q_{rev}}{T}$ (D)…
View solution →The process that is NOT endothermic in nature is :
View solution →The correct statement amongst the following is :
View solution →1 mole of ideal gas is allowed to expand reversibly and adiabatically from a temperature of $27^{\circ} \mathrm{C}$. The work done is $3 \mathrm{~kJ} \mathrm{~mol}^{-1}$. The…
View solution →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 condition then work, $\mathrm{w}$,…
View solution →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 +…
View solution →Five moles of an ideal gas at 1 bar and 298 K is expanded into vacuum to double the volume. The work done is :
View solution →The internal energy change (in J) When 90 g of water undergoes complete evaporation at 100oC is ____________. (Given : $\Delta$Hvap for water at 373 K = 41 kJ/mol, R = 8.314…
View solution →The effect of temperature on spontaneity of reactions are represented as : .tg {border-collapse:collapse;border-spacing:0;} .tg…
View solution →The standard enthalpies of formation of Al2O3 and CaO are $-$1675 kJ mol-1 and $-$635 kJ mol$-$1 respectively.For the reaction3CaO + 2Al $\to$ 3Ca + Al2O3 the standard reaction…
View solution →At 25$^\circ$C and 1 atm pressure, the enthalpies of combustion are as given below : .tg {border-collapse:collapse;border-spacing:0;} .tg…
View solution →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 the lattice enthalpy of NaBr is…
View solution →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 equal to 1 (c) CP, m – CV,…
View solution →Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following :
View solution →A liquid when kept inside a thermally insulated closed vessel at $25^{\circ} \mathrm{C}$ was mechanically stirred from outside. What will be the correct option for the following…
View solution →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-family:Arial,…
View solution →Let us consider an endothermic reaction which is non-spontaneous at the freezing point of water. However, the reaction is spontaneous at boiling point of water. Choose the correct…
View solution →$$\begin{aligned} & \mathrm{S}(\mathrm{~g})+\frac{3}{2} \mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{SO}_3(\mathrm{~g})+2 x \mathrm{kcal} \\ &…
View solution →Let us consider a reversible reaction at temperature, T. In this reaction, both $\Delta \mathrm{H}$ and $\Delta \mathrm{S}$ were observed to have positive values. If the…
View solution →Among the following the number of state variables is ______________. Internal energy (U) Volume (V) Heat (q) Enthalpy (H)
View solution →Enthalpies of formation of $\mathrm{CCl}_{4}(\mathrm{~g}), \mathrm{H}_{2} \mathrm{O}(\mathrm{g}), \mathrm{CO}_{2}(\mathrm{~g})$ and $\mathrm{HCl}(\mathrm{g})$ are $-105,-242,-394$…
View solution →Consider the following cases of standard enthalpy of reaction $\left(\Delta \mathrm{H}_{\mathrm{r}}^{\circ}\right.$ in $\left.\mathrm{kJ} \mathrm{mol}^{-1}\right)$…
View solution →The standard enthalpy and standard entropy of decomposition of $\mathrm{N}_2 \mathrm{O}_4$ to $\mathrm{NO}_2$ are $55.0 \mathrm{~kJ} \mathrm{~mol}^{-1}$ and $175.0 \mathrm{~J} /…
View solution →Standard entropies of $\mathrm{X}_2, \mathrm{Y}_2$ and $\mathrm{XY}_5$ are 70, 50 and $110 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}$ respectively. The temperature in Kelvin…
View solution →Consider the following data : Heat of formation of $\mathrm{CO}_2(\mathrm{g})=-393.5 \mathrm{~kJ} \mathrm{~mol}{ }^{-1}$ Heat of formation of $\mathrm{H}_2…
View solution →A sample of n -octane $(1.14 \mathrm{~g})$ was completely burnt in excess of oxygen in a bomb calorimeter, whose heat capacity is $5 \mathrm{~kJ} \mathrm{~K}^{-1}$. As a result of…
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