Q JEE MAIN 2026

$20.0 \mathrm{dm}^3$ of an ideal gas ' X ' at 600 K and 0.5 MPa undergoes isothermal reversible expansion until...

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Q JEE MAIN 2026

Molar conductivity of a weak acid HQ of concentration 0.18 M was found to be $1 / 30$ of the...

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Q JEE MAIN 2026

The heat of atomisation of methane and ethane are ' $\mathrm{x}{ }^{\prime} \mathrm{kJmol}^{-1}$ and ' $\mathrm{y}{ }^{\prime} \mathrm{kJmol}^{-1}$ respectively. The...

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Q JEE MAIN 2026

Match the LIST-I with LIST-II Choose the correct answer from the options given below:

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Q JEE MAIN 2026

It is noticed that $\mathrm{Pb}^{2+}$ is more stable than $\mathrm{Pb}^{4+}$ but $\mathrm{Sn}^{2+}$ is less stable than $\mathrm{Sn}^{4+}$. Observe the following...

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Q JEE MAIN 2026

A cup of water at $5^{\circ} \mathrm{C}$ (system) is placed in a microwave oven and the oven is turned on...

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Q JEE MAIN 2026

If the enthalpy of sublimation of Li is $155 \mathrm{~kJ} \mathrm{~mol}^{-1}$, enthalpy of dissociation of $\mathrm{F}_2$ is $150 \mathrm{~kJ} \mathrm{~mol}^{-1}$,...

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Q JEE MAIN 2026

Dissociation of a gas $\mathrm{A}_2$ takes place according to the following chemical reaction. At equilibrium, the total pressure is 1...

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Q JEE MAIN 2026

Choose the correct answer from the options given below:

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Q JEE MAIN 2026

Consider the following data: $\Delta_f \mathrm{H}^{!} \quad($ Methane, g$)=-\mathrm{XkJ} \mathrm{mol}^{-1}$ Enthalpy of sublimation of graphite $=\mathrm{Y} \mathrm{kJ} \mathrm{mol}^{-1}$ Dissociation enthalpy...

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Q JEE MAIN 2019

Enthalpy of sublimation of iodine is $24 \mathrm{cal} \mathrm{g}^{-1}$ at $200^{\circ} \mathrm{C}$. If specific heat of $\mathrm{I}_2(\mathrm{~s})$ and $\mathrm{I}_2(\mathrm{vap})$ are...

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Q JEE MAIN 2019

An ideal gas is allowed to expand from 1 L to 10 L against a constant external pressure of 1...

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Q JEE MAIN 2020

The internal energy change (in J ) when 90 g of water undergoes complete evaporation at $100^{\circ} \mathrm{C}$ is $\_\_\_\_$...

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Q JEE MAIN 2020

The heat of combustion of ethanol into carbon dioxide and water is -327 kcal at constant pressure. The heat evolved...

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Q JEE-MAIN 2019

For a diatomic ideal gas in a closed system, which of the following plots does not correctly describe the relation...

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Q JEE MAIN_2019_

A process will be spontaneous at all temperatures if

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Q JEE MAIN 2019

Among the following, the set of parameters that represents path functions, is (A) q + w (B) q (C) w...

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Q JEE MAIN 2019

The entropy change associated with the conversion of 1 kg of ice at 273 K to water vapours at 383...

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Q JEE MAIN 2020

An oxidation-reduction reaction in which 3 electrons are transferred has a $\Delta \mathrm{G}^0$ of $17.37 \mathrm{~kJ} \mathrm{~mol}^{-1}$ at $25^{\circ} \mathrm{C}$....

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Q JEE MAIN 2019

The combination of plots which does not represent isothermal expansion of an ideal gas is

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Q JEE MAIN 2019

The entropy change associated with the conversion of 1 kg of ice at 273 K to water vapours at 383...

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Q JEE MAIN 2019

Given (i) $$ \begin{aligned} & \mathrm{C}(\text { graphite })+\mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{CO}_2(\mathrm{~g}) \text {; } \\ & \Delta r \mathrm{H}^{\circ}=x \mathrm{~kJ}...

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Q JEE MAIN 2019

Two blocks of the same metal having same mass and at temperature $T_1$ and $T_2$, respectively, are brought in contact...

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Q JEE MAIN 2020

If enthalpy of atomisation for $\mathrm{Br}_{2(I)}$ is $\times \mathrm{kJ} / \mathrm{mol}$ and bond enthalpy for $\mathrm{Br}_2$ is $...

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Q JEE MAIN 2020

The magnitude of work done by a gas that undergoes reversible expansion along the path ABC shown in the figure...

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Q JEE-MAIN 2020

For a dimerization reaction $$ 2 \mathrm{~A}(\mathrm{~g}) \rightarrow \mathrm{A}_2(\mathrm{~g}) $$ at $298 \mathrm{~K}, \Delta \mathrm{U}^{\circ}=-20 \mathrm{~kJ} \mathrm{~mol}^{-1}, \Delta \mathrm{~S}^{\circ}=-30$ $...

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Q JEE MAIN 2020

Lattice enthalpy and enthalpy of solution of NaCl are $788 \mathrm{~kJ} \mathrm{~mol}^{-1}$ and $4 \mathrm{~kJ} \mathrm{~mol}^{-1}$, respectively. The hydration enthalpy...

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Q JEE MAIN 2019

The difference between $\Delta \mathrm{H}$ and $\Delta \mathrm{U}(\Delta \mathrm{H}-\Delta \mathrm{U})$, when the combustion of one mole of heptane(I) is carried...

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Q JEE Main 2019

A process had $\Delta \mathrm{H}=200 \mathrm{Jmol}^{-1}$ and $\Delta \mathrm{S}=40 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}$. Out of the values given below, choose the minimum...

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Q JEE MAIN 2019

The standard reaction Gibbs energy for a chemical reaction at an absolute temperature T is given by $\Delta_{\mathrm{r}} \mathrm{G}^{\circ}=\mathrm{A}-\mathrm{BT}$ Where...

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Q JEE MAIN 2020

Five moles of an ideal gas at 1 bar and 298 K is expanded into vacuum to double the volume....

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Q JEE MAIN 2020

For one mole of an ideal gas, which of these statements must be true? (a) U and H each depends...

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Q JEE MAIN 2019

The reaction $\mathrm{MgO}(\mathrm{s})+\mathrm{C}(\mathrm{s}) \rightarrow \mathrm{Mg}(\mathrm{s})+\mathrm{CO}(\mathrm{g})$, for which $\quad \Delta_{\mathrm{r}} \mathrm{H}^{\circ}=+491.1 \mathrm{~kJ} \mathrm{~mol}^{-1}$ and $\Delta_{\mathrm{r}} \mathrm{S}^{\circ}=198.0 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}$, is not feasible...

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Q JEE MAIN 2020

The true statement amongst the following is

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Q JEE MAIN 2020

At constant volume, 4 mol of an ideal gas when heated from 300 K to 500 K changes its internal...

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Q JEE MAIN 2020

For the reaction $\mathrm{A}(\mathrm{l}) \rightarrow 2 \mathrm{~B}(\mathrm{~g})$ $\Delta \mathrm{U}=2.1 \mathrm{kcal}, \Delta \mathrm{S}=20 \mathrm{cal} \mathrm{K}^{-1}$ at 300 K . Hence $...

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Q JEE MAIN 2019

During compression of a spring the work done is 10 kJ and 2 kJ escaped to the surroundings as heat....

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Q JEE-MAIN 2021

For water $\Delta_{\text {vap }} \mathrm{H}=41 \mathrm{~kJ} \mathrm{~mol}^{-1}$ at 373 K and 1 bar pressure. Assuming that water vapour is...

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Q JEE MAIN 2021

If the standard molar enthalpy change for combustion of graphite powder is $-2.48 \times 10^2 \mathrm{~kJ} \mathrm{~mol}^{-1}$ , the amount...

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Q JEE MAIN 2021

The incorrect expression among the following is:

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Q JEE MAIN 2019

The process with negative entropy change is :

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Q JEE MAIN 2021

200 mL of 0.2 M HCl is mixed with 300 mL of 0.1 M NaOH . The molar heat of...

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Q JEE MAIN_2021_

When 400 mL of $0.2 \mathrm{M} \mathrm{H}_2 \mathrm{SO}_4$ solution is mixed with 600 mL of 0.1 M NaOH solution, the...

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Q JEE MAIN 2021

For the reaction $2 \mathrm{NO}_2(\mathrm{~g}) \mathrm{N}_2 \mathrm{O}_4(\mathrm{~g})$, when $\Delta \mathrm{S}=-176.0 \mathrm{JK}^{-1}$ and $\Delta \mathrm{H}=-57.8 \mathrm{~kJ} \mathrm{~mol}^{-1}$, the magnitude of $...

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Q JEE-MAIN 2021

The number of atoms in 8 g of sodium is $x \times 10^{23}$. The value of x is________.(Nearest integer) [Given:...

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Q JEE MAIN 2019

For silver, $\mathrm{C}_{\mathrm{D}}\left(\mathrm{JK}^{-1} \mathrm{~mol}^{-1}\right)=23+0.01 \mathrm{~T}$. If the temperature (T) of 3 moles of silver is raised from 300 K to...

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Q JEE MAIN 2021

A system does 200 J of work and at the same time absorbs 150 J of heat. The magnitude of...

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Q JEE MAIN

Which one of the following equations does not correctly represent the first law of thermodynamics for the given processes involving...

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Q JEE MAIN 2021

At 298 K , the enthalpy of fusion of a solid $(\mathrm{X})$ is $2.8 \mathrm{~kJ} \mathrm{~mol}^{-1}$ and the enthalpy of...

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Q JEE MAIN 2021

For a given chemical reaction $\mathrm{A} \rightarrow \mathrm{B}$ at 300 K the free energy change is $-49.4 \mathrm{~kJ} \mathrm{~mol}^{-1}$ and...

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Q JEE MAIN 2021

For water at $100^{\circ} \mathrm{C}$ and $1 \mathrm{bar}, \Delta_{\text {vap }} \mathrm{H}-\Delta_{\text {vap }} \mathrm{U}=$ $\_\_\_\_$ $\times 10^2 \mathrm{~J} \mathrm{~mol}^{-1}$....

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Q JEE MAIN 2019

5 moles of an ideal gas at 100 K are allowed to undergo reversible compression till its temperature becomes 200...

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Q JEE-MAIN 2021

During which of the following processes, does entropy decrease ?

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Q JEE MAIN 2021

Five moles of an ideal gas at 293 K is expanded isothermally from an initial pressure of 2.1 MPa to...

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Q JEE-Main-2021

The standard enthalpies of formation of $\mathrm{Al}_2 \mathrm{O}_3$ and CaO are $-1675 \mathrm{~kJ} \mathrm{~mol}^{-1}$ and $-635 \mathrm{~kJ} \mathrm{~mol}^{-1}$ respectively. For...

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Q JEE MAIN 2021

At $25^{\circ} \mathrm{C}, 50 \mathrm{~g}$ of iron reacts with HCl to form $\mathrm{FeCl}_2$. The evolved hydrogen gas expands against a...

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Q JEE MAIN 2021

Assuming ideal behaviour, the magnitude of $\log \mathrm{K}$ for the following reaction at $25^{\circ} \mathrm{C}$ is $\mathrm{x} \times 10^{-1}$. The...

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Q JEE Main 2019

Consider the reversible isothermal expansion of an ideal gas in a closed system at two different temperatures T1 and T2...

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Q JEE MAIN 2021

For the reaction $\mathrm{C}_2 \mathrm{H}_6 \longrightarrow \mathrm{C}_2 \mathrm{H}_4+\mathrm{H}_2$ the reaction enthalpy $\Delta_{\mathrm{r}} \mathrm{H}=$ $\_\_\_\_$ $\mathrm{kJ} \mathrm{mol}^{-1}$. (Round off to the...

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Q JEE MAIN 2021

The average $\mathrm{S}-\mathrm{F}$ bond energy in $\mathrm{kJ} \mathrm{mol}^{-1}$ of $\mathrm{SF}_6$ is $\_\_\_\_$ (Rounded off to the nearest integer) [Given :...

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Q JEE MAIN 2021

For a chemical reaction $\mathrm{A}+\mathrm{B} \rightleftharpoons \mathrm{C}+\mathrm{D}\left(\Delta_{\mathrm{r}} \mathrm{H}^0=\right. 80 \mathrm{~kJ} \mathrm{~mol}^{-1}$ ) the entropy change $\Delta_{\mathrm{r}} \mathrm{S}^0$ depends on the...

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Q JEE MAIN 2021

The ionization enthalpy of $\mathrm{Na}^{+}$formation from $\mathrm{Na}_{(\mathrm{g})}$ is $495.8 \mathrm{~kJ} \mathrm{~mol}^{-1}$, while the electron gain enthalpy of Br is $...

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Q JEE MAIN 2021

The reaction of cyanamide, $\mathrm{NH}_2 \mathrm{CN}_{(\mathrm{s})}$ with oxygen was run in a bomb calorimeter and $\Delta \mathrm{U}$ was found to...

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Q JEE MAIN 2022

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...

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Q JEE MAIN 2022

While performing a thermodynamics experiment, a student made the following observations, $...

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Q JEE MAIN 2022

When 600 mL of $0.2 \mathrm{M} \mathrm{HNO}_3$ is mixed with 400 mL of 0.1 M NaOH solution in a flask,...

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Q JEE MAIN 2022

A gas (Molar mass $=280 \mathrm{~g} \mathrm{~mol}^{-1}$ ) was burnt in excess $\mathrm{O}_2$ in a constant volume calorimeter and during...

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Q JEE MAIN 2022

Among the following the number of state variable is ______. Internal energy (U) Volume (V) Heat (q) Enthalpy (H)

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Q JEE MAIN 2022

2.4 g coal is burnt in a bomb calorimeter in excess of oxygen at 298 K and 1 atm pressure....

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Q JEE-Main 2022

The enthalpy of combustion of propane, graphite and dihydrogen at 298 K are: $-2220.0 \mathrm{~kJ} \mathrm{~mol}^{-1},-393.5 \mathrm{~kJ}$ mol-1 and $...

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Q JEE MAIN 2022

Which of the following relation is not correct ?

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Q JEE MAIN 2022

Given below are two statements :One is labeled as Assertion A and the other is labeled as Reason R Assertion...

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Q JEE MAIN 2022

For combustion of one mole of magnesium in an open container at 300 K and 1 bar pressure, $...

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Q JEE MAIN 2022

A fish swimming in water body when taken out from the water body is covered with a film of water...

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Q JEE MAIN 2022

When 5 moles of He gas expand isothermally and reversibly at 300 K from 10 litre to 20 litre, the...

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Q JEE MAIN 2022

At $25^{\circ} \mathrm{C}$ and 1 atm pressure, the enthalpy of combustion of benzene (1) and acetylene (g) are $...

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Q JEE-Main 2022

| Substance | $\mathrm{H}_2$ | C(graphite) | $\mathrm{C}_2 \mathrm{H}_6(\mathrm{~g})$ | | :--- | :--- | :--- | :--- | |...

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Q JEE MAIN 2022

4.0 L of an ideal gas is allowed to expand isothermally into vacuum until the total volume is 20 L....

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Q JEE MAIN 2022

17.0 g of $\mathrm{NH}_3$ completely vapourises at – $33.42^{\circ} \mathrm{C}$ and 1 bar pressure and the enthalpy change in the...

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Q JEE MAIN 2022

For complete combustion of methanol $\mathrm{CH}_3 \mathrm{OH}(1)+\frac{3}{2} \mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{CO}_2(\mathrm{~g})+2 \mathrm{H}_2 \mathrm{O}(1)$ the amount of heat produced as measured by...

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Q JEE MAIN 2022

The standard entropy change for the reaction $4 \mathrm{Fe}(\mathrm{s})+3 \mathrm{O}_2(\mathrm{~g}) \rightarrow 2 \mathrm{Fe}_2 \mathrm{O}_3(\mathrm{~s})$ is $-550 \mathrm{JK}^{-1}$ at 298 K....

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Q JEE MAIN 2024

If 5 moles of an ideal gas expands from 10 L to a volume of 100 L at 300 K...

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Q JEE MAIN 2022

Match List-I with List-II Choose the correct answer from the options given below:

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Q JEE MAIN 2024

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})}, \Delta \mathrm{H}^{\mathrm{o}}=-822 \mathrm{~kJ} / \mathrm{mol} \\...

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Q JEE MAIN 2024

Standard enthalpy of vapourisation for $\mathrm{CCl}_4$ is $30.5 \mathrm{~kJ} \mathrm{~mol}^{-1}$. Heat required for vapourisation of $284 \mathrm{~g}_{\mathrm{g}}$ of $\mathrm{CCl}_4$ at...

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Q JEE MAIN 2024

For a certain thermochemical reaction $M \rightarrow N$ at $\mathrm{T}=400 \mathrm{~K}, \Delta \mathrm{H}^{\ominus}=77.2 \mathrm{~kJ} \mathrm{~mol}^{-1}, \Delta \mathrm{~S}=122 \mathrm{JK}^{-1}, \log$ equilibrium...

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Q JEE MAIN 2025

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Q JEE MAIN 2025

Consider the given data : (a) $\mathrm{HCl}(\mathrm{g})+10 \mathrm{H}_2 \mathrm{O}(\mathrm{l}) \rightarrow \mathrm{HCl} .10 \mathrm{H}_2 \mathrm{O} \quad \Delta \mathrm{H}=-69.01 \mathrm{~kJ} \mathrm{~mol}^{-1}$ (b)...

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Q JEE-Main_2023

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 $-105,-242,-394$ and $-92 \mathrm{~kJ} \mathrm{~mol}^{-1}$ respectively. The magnitude of...

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Q JEE MAIN 2025

The correct statement amongst the following is :

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Q JEE MAIN 2025

The hydration energies of $\mathrm{K}^{+}$and $\mathrm{Cl}^{-}$are $-x$ and $-y \mathrm{~kJ} / \mathrm{mol}$ respectively. If lattice energy of KCl is $...

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Q JEE MAIN 2025

A sample of $n$-octane $(1.14 \mathrm{~g})$ was completely burnt in excess of oxygen in a bomb calorimeter, whose heat capacity...

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Q JEE MAIN 2025

A perfect gas ( 0.1 mol ) having $\overline{\mathrm{C}}_v=1.50 \mathrm{R}$ (independent of temperature) undergoes the above transformation from point 1...

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Q JEE MAIN 2023

The total number of intensive properties from the following is $\_\_\_\_$ Volume, Molar heat capacity, Molarity, $\mathrm{E}^\theta$ cell, Gibbs free...

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Q JEE MAIN 2023

Identify the correct order of standard enthalpy of formation of sodium halides.

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Q JEE MAIN 2023

What happens when methane undergoes combustion in systems A and B respectively?

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Q JEE MAIN 2023

The number of endothermic process/es from the following is ______ (A) $\mathrm{I}_2(\mathrm{~g}) \rightarrow 2 \mathrm{I}(\mathrm{g})$ (B) $\mathrm{HCl}(\mathrm{g}) \rightarrow \mathrm{H}(\mathrm{g})+\mathrm{Cl}(\mathrm{g})$ (C)...

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Q JEE MAIN 2023

Consider the following data

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Q JEE MAIN 2023

One mole of an ideal gas at 350K is in a 2.0 L vessel of thermally conducting walls, which are...

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Q JEE MAIN 2023

0.3 g of ethane undergoes combustion at $27^{\circ} \mathrm{C}$ in a bomb calorimeter. The temperature of calorimeter system (including the...

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Q JEE MAIN 2023

1 mole of ideal gas is allowed to expand reversibly and adiabatically from a temperature of $27^{\circ} \mathrm{C}$. The work...

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Q JEE MAIN 2023

28.0 L of $\mathrm{CO}_2$ is produced on complete combustion of 16.8 L gaseous mixture of ethane and methane at $...

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Q JEE MAIN 2023

One mole of an ideal monoatomic gas is subjected to changes as shown in the graph. The magnitude of the...

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Q JEE MAIN 2023

30.4 kJ of heat is required to melt one mole of sodium chloride and the entropy change at the melting...

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Q JEE MAIN 2023

A2 + B2  2AB. kJ mol–1 AB, A2 and B2 are diatomic molecule. If the bond enthalpies of A2,...

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Q JEE MAIN 2023

Solid fuel used in rocket is a mixture of $\mathrm{Fe}_2 \mathrm{O}_3$ and Al (in ratio 122 ). The heat evolved...

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Q JEE MAIN 2023

When a 60 W electric heater is immersed in a gas for 100s in a constant volume container with adiabatic...

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Q JEE MAIN 2023

Given: (A) $2 \mathrm{CO}(\mathrm{g})+\mathrm{O}_2(\mathrm{~g}) \rightarrow 2 \mathrm{CO}_2(\mathrm{~g})$ in $\quad \Delta \mathrm{H}_1^{\ominus}=-\mathrm{x} \mathrm{kJ} \mathrm{mol}^{-1}$ (B) C (graphite) $+\mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{CO}_2(\mathrm{~g})$; $...

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Q JEE MAIN 2023

The value of log K for the reaction A ⇋ B at 298 K is____. (Nearest integer) Given: $$ \begin{aligned}...

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Q JEE MAIN 2023

Consider the graph of Gibbs free energy G vs Extent of reaction. The number of statement/s from the following which...

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Q JEE MAIN 2023

For independent process at 300 K. The number of non-spontaneous process from the following is ______.

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Q JEE-Main_2023

When 2 litre of ideal gas expands isothermally into vacuum to a total volume of 6 litre, the change in...

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Q JEE MAIN 2023

The enthalpy change for the conversion of $\frac{1}{2} \mathrm{Cl}_2(\mathrm{~g})$ to $\mathrm{Cl}^{-}(\mathrm{aq})$ is (-) $\_\_\_\_$ $\mathrm{kJ} \mathrm{mol}^{-1}$ (Nearest integer) Given: $...

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Q JEE MAIN 2023

At 25°C, the enthalpy of the following processes are given: $...

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Q JEE MAIN 2023

For independent process at 300 K. The number of non-spontaneous process from the following is ______.

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Q JEE MAIN 2024

When equal volume of 1 MHCl and $1 \mathrm{MH}_2 \mathrm{SO}_4$ are separately neutralised by excess volume of 1 M NaOH...

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Q JEE MAIN 2024

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 $...

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Q JEE MAIN 2024

Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following :

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Q JEE MAINS 2024

The enthalpy of formation of ethane (C_2 H_6 ) from ethylene by addition of hydrogen where the bondenergies of C-H,C-C,H-H...

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Q JEE MAIN 2024

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....

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Q JEE-Main_2024

Consider the figure provided. 1 mol of an ideal gas is kept in a cylinder, fitted with a piston, at...

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Q JEE MAIN 2024

The heat of combustion of solid benzoic acid at constant volume is -321.30" " kJ at 〖27〗^∘ C. The heat...

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Q JEE MAIN 2024

Consider the following reaction at 298" " K. $\frac{3}{2} \mathrm{O}_{2(\mathrm{~g})} \rightleftharpoons \mathrm{O}_{3(\mathrm{~g})} \cdot \mathrm{K}_{\mathrm{p}}=2.47 \times 10^{-29}$ $\Delta_{\mathrm{r}} \mathrm{G}^{\Theta}$ for the...

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Q JEE MAIN 2024

Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R)...

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Q JEE MAIN 2024

An ideal gas undergoes a cyclic transformation starting from the point A and coming back to the same point by...

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Q JEE MAIN 2024

Which of the following is not correct ?

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Q JEE MAIN 2024

Chlorine undergoes disproportionation in alkaline medium as shown below : a Cl_2 (" " g)+bOH^- (aq)→cClO^- (aq)+dCl^- (aq) +e_2 O(l)...

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Q JEE MAIN 2025

Which of the following graphs correctly represents the variation of thermodynamic properties of Haber's process?

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Q JEE MAIN 2025

Arrange the following in order of magnitude of work done by the system/on the system at constant temperature. (a) $...

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Q JEE MAIN 2024

If three moles of an ideal gas at 300 K expand isotherrnally from $30dm^3$ to $45dm^3$ against a constant opposing...

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Q JEE MAIN 2025

If $C$ (diamond) $\rightarrow C$ (graphite ) $+X \mathrm{~kJ} \mathrm{~mol}^{-1}$ $\mathrm{C}($ diamond $)+\mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{CO}_{2}(\mathrm{~g})+\mathrm{YkJmol}^{-1}$ C (graphite) $+\mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{CO}_{2}(\mathrm{~g})+\mathrm{ZkJmol}^{-1}$...

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Q JEE MAIN 2025

Total enthalpy change for freezing of 1 mol of water at ${10^\circ}{\rm{C}}$ to ice at $ - {10^\circ }{\rm{C}}$ is...

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Q JEE MAIN 2025

One mole of an ideal gas expands isothermally and reversibly from $10{\rm{d}}{{\rm{m}}^3}$ to $20{\rm{d}}{{\rm{m}}^3}$ at 300 K. $\Delta {\rm{U}},{\rm{q}}$ and...

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Q JEE MAIN 2025

Let us consider a reversible reaction at temperature, T. In this reaction, both $\Delta {\rm{H}}$ and $\Delta {\rm{S}}$ were observed...

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Q JEE MAIN 2025

Consider the following data : Heat of formation of $\mathrm{CO}_{2}(\mathrm{~g})=-393.5 \mathrm{~kJ} \mathrm{~mol}^{-1}$ Heat of formation of $\mathrm{H}_{2} \mathrm{O}(\mathrm{l})=-286.0 \mathrm{~kJ} \mathrm{~mol}^{-1}$...

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Q JEE MAIN 2025

An ideal gas undergoes a cyclic transformation starting from the point $A$ and coming back to the same point by...

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Q JEE MAIN 2025

Given : $\Delta {{\rm{H}}^ \ominus }{\rm{ sub }}$ $[{\rm{C }}({\rm{graphite}})] = 710\;{\rm{kJ}}\;{\rm{mo}}{{\rm{l}}^{ - 1}}$ $...

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Q JEE MAIN 2025

Which of the following properties will change when system containing solution 1 will become solution 2?

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Q JEE MAIN 2025

$\mathrm{S}(\mathrm{g})+\frac{3}{2} \mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{SO}_{3}(\mathrm{~g})+2 x \mathrm{kcal}$ $\mathrm{SO}_{2}(\mathrm{~g})+\frac{1}{2} \mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{SO}_{3}(\mathrm{~g})+y \mathrm{kcal}$ The heat of formation of $\mathrm{SO}_{2}(\mathrm{~g})$ is given by...

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Q JEE MAIN 2025

Two vessels A and B are connected via stopcock. The vessel A is filled with a gas at a certain...

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Q JEE MAIN 2025

The bond dissociation enthalpy of $\mathrm{X}_{2} \Delta \mathrm{H}_{\text {bond }}^{\circ}$ calculated from the given data is $\_\_\_\_$ $\mathrm{kJmol}{ }^{-1}$. (Nearest...

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Q JEE MAIN 2025

The effect of temperature on spontaneity of reactions are represented as : The incorrect combinations are:

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Q JEE MAIN 2025

500 J of energy is transferred as heat to 0.5 mol of Argon gas at 298 K and 1.00 atm...

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Q JEE MAIN 2025

The formation enthalpies, $\Delta {{\rm{H}}_{\rm{f}}}^ \ominus $ for ${{\rm{H}}_{({\rm{g}})}}$ and ${{\rm{O}}_{({\rm{g}})}}$ are 220.0 and $250.0\;{\rm{kJ}}\;{\rm{mo}}{{\rm{l}}^{ - 1}}$ , respectively, at...

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Q JEE MAIN 2025

Standard entropies of ${{\rm{X}}_2},{{\rm{Y}}_2}$ and ${\rm{X}}{{\rm{Y}}_5}$ are 70, 50 and $110{\mkern 1mu} {\rm{J}}{{\rm{K}}^{-1}}{\rm{mo}}{{\rm{l}}^{-1}}$ respectively. The temperature in Kelvin at which...

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Q JEE MAIN 2025

Let us consider an endothermic reaction which is non-spontaneous at the freezing point of water. However, the reaction is spontaneous...

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Q JEE MAIN 2025

The standard enthalpy and standard entropy of decomposition of ${{\text{N}}_{2}}{{\text{O}}_{4}}$ to $\text{N}{{\text{O}}_{2}}$ are $55.0~\text{kJ}~\text{mo}{{\text{l}}^{{-1}}}$ and $175.0~\text{J}/\text{K}/\text{mol}$ respectively. The standard free...

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Q JEE MAIN 2025

Ice at $-{{5}^{{}^\circ }}\text{C}$ is heated to become vapor with temperature of ${{110}^{{}^\circ }}\text{C}$ at atmospheric pressure. The entropy change...

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Q JEE MAIN 2025

A liquid when kept inside a thermally insulated closed vessel at 25°C was mechanically stirred from outside. What will be...

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Q JEE MAIN 2025

Consider the following cases of standard enthalpy of reaction ( $\Delta \mathrm{H}_{\mathrm{r}}^{\circ}$ in $\mathrm{kJmol}^{-1}$ ) $$ \begin{aligned} & \mathrm{C}_2 \mathrm{H}_6(\mathrm{~g})+\frac{7}{2}...

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Q JEE MAIN 2025

Match List - I with List - II.

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