Q JEE MAIN_2026

Solid carbon, CaO and $\mathrm{CaCO}_3$ are mixed and allowed to attain equilibrium at TK . $$ \begin{aligned} & \mathrm{CaCO}_3(\mathrm{~s}) \mathrm{f}...

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Q JEE MAIN 2026

In a closed flask at 600 K , one mole of $\mathrm{X}_2 \mathrm{Y}_4(\mathrm{~g})$ attains equilibrium as given below :$...

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Q JEE MAIN_2026

Consider the following reactions in which all the reactants and products are present in gaseous state

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Q JEE MAIN_2026

One mole each of He and A(g) are taken in a 10 L closed flask and heated to 400 K...

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Q JEE MAIN_2026

The reaction $\mathrm{A}(\mathrm{g}) \mathrm{f} \quad \mathrm{B}(\mathrm{g})+\mathrm{C}(\mathrm{g})$ was initiated with the amount ' a ' of $\mathrm{A}(\mathrm{g})$. At equilibrium it is...

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Q JEE MAIN_2026

The values of pressure equilibrium constant recorded at different temperatures for the following equilibrium reaction have been given below $...

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Q JEE MAIN_2026

For the following reaction at $50^{\circ} \mathrm{C}$ and at 2 atm pressure, $$ 2 \mathrm{~N}_2 \mathrm{O}_5(\mathrm{~g}) \mathrm{f} \quad 2 \mathrm{~N}_2...

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Q JEE MAIN_2026

The pH of a solution obtained by mixing 5 mL of $0.1 \mathrm{MNH}_4 \mathrm{OH}$ solution with 250 mL of $...

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Q JEE MAIN_2026

At $\mathrm{T}(\mathrm{K})$, the equilibrium constant of $\mathrm{A}_2(g)+\mathrm{B}_2(g) \mathrm{f} \mathrm{C}(g)$ is $2.7 \times 10^{-5}$. What is the equilibrium constant for $...

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Q JEE MAIN_2026

At the transition temperature $T, A f \quad B$ and $\Delta G^0=105-35 \log T$ where $A$ and $B$ are two...

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Q JEE MAIN_2026_

Observe the following equilibrium in a 1 L flask. $$ A(g) \rightleftharpoons B(g) $$ At $\mathrm{T}(\mathrm{K})$, the equilibrium concentrations of...

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Q JEE MAIN 2026

Consider the following gaseous equilibrium in a closed container of volume ' $V$ ' at $T(K)$. $$ \mathrm{P}_2(\mathrm{~g})+\mathrm{Q}_2(\mathrm{~g}) \boxtimes \quad...

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Q JEE MAIN 2026

$$ X_2(g)+Y_2(g) \boxtimes \quad 2 Z(g) $$ $\mathrm{X}_2(\mathrm{~g})$ and $\mathrm{Y}_2(\mathrm{~g})$ are added to a 1 L flask and it is...

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Q JEE MAIN 2026

For the following gas phase equilibrium reaction at constant temperature, $$ \mathrm{NH}_3(\mathrm{~g}) \rightleftharpoons 1 / 2 \mathrm{~N}_2(\mathrm{~g})+3 / 2 \mathrm{H}_2(\mathrm{~g})...

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Q JEE MAIN 2026

Consider the general reaction given below at 400 K $$ x \mathrm{~A}(\mathrm{~g}) \rightleftharpoons y \mathrm{~B}(\mathrm{~g}) . $$ The values of...

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Q JEE MAIN 2026

The temperature at which the rate constants of the given below two gaseous reactions become equal is _____K. (Nearest integer)...

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Q JEE MAIN 2026

The formal changes on the atoms marked as (1) to (4) in the Lewis representation of $\mathrm{HnO}_3$ molecule respectively are

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Q JEE MAIN_2026_

For the reaction, $\mathrm{N}_2 \mathrm{O}_4 \rightleftharpoons 2 \mathrm{NO}_2$, graph is plotted as shown below. Identify correct statements. A. Standard free...

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Q JEE MAIN 2019

The INCORRECT match in the following is

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Q JEE MAIN 2019

In which one of the following equilibria, $\mathrm{K}_{\mathrm{P}} \neq \mathrm{K}_{\mathrm{C}}$ ?

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Q JEE MAIN_2019_

A bacterial infection in an internal wound grows as $\mathrm{N}^{\prime}(\mathrm{t})=\mathrm{N}_0 \exp (\mathrm{t})$, where the time t is in hours. A...

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Q JEE-MAIN 2019

Two solids dissociate as follows $\begin{aligned} & \mathrm{A}(\mathrm{s}) \rightleftharpoons \mathrm{B}(\mathrm{g})+\mathrm{C}(\mathrm{g}) ; \mathrm{K}_{\mathrm{P}_1}=\mathrm{x} \mathrm{atm}^2 \\ & \mathrm{D}(\mathrm{s}) \rightleftharpoons \mathrm{C}(\mathrm{g})+\mathrm{E}(\mathrm{g}) ; \mathrm{K}_{\mathrm{P}_2}=\mathrm{yatm}^2\end{aligned}$...

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Q JEE MAIN 2020

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Q JEE MAIN 2019

For the chemical reaction $\mathrm{X} \rightleftharpoons \mathrm{Y}$, the standard reaction Gibbs energy depends on temperature T (in K ) as...

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Q JEE MAIN 2019

Consider the reaction $$ \mathrm{N}_2(\mathrm{~g})+3 \mathrm{H}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NH}_3(\mathrm{~g}) $$ The equilibrium constant of the above reaction is $\mathrm{K}_{\mathrm{P}}$. If...

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Q JEE-MAIN 2020

For a reaction $X+Y=2 Z, 1.0 \mathrm{~mol}$ of $X, 1.5 \mathrm{~mol}$ of $Y$ and 0.5 mol of $Z$ were taken...

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Q JEE MAIN 2020

For the equilibrium $\mathrm{A} \rightleftharpoons \mathrm{B}$, the variation of the rate of the forward (a) and reverse (b) reaction with...

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Q JEE Main 2019

The values of $\frac{K_p}{K_c}$ for the following reactions at 300 K are, respectively (At $300 \mathrm{~K}, \mathrm{RT}=24.62 \mathrm{dm}^3 \mathrm{~atm} \mathrm{~mol}^{-1}$...

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Q JEE MAIN 2020

A sample of red ink (a colloidal suspension) is prepared by mixing eosin dye, egg white, HCHO and water. The...

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Q JEE MAIN 2019

For the equilibrium

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Q JEE MAIN 2020

If the equilibrium constant for $\mathrm{A} \rightleftharpoons \mathrm{B}+\mathrm{Cis}_{\mathrm{eq}}^{(1)}$ and that of $\mathrm{B}+\mathrm{C} \rightleftharpoons \mathrm{P}$ is $\mathrm{K}_{\mathrm{eq}}^{(2)}$, the equilibrium constant for...

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Q JEE MAIN 2020

In the figure shown below reactant A (represented by square) is in equilibrium with product B (represented by circle). The...

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Q JEE MAIN 2021

When 5.1 g of solid $\mathrm{NH}_4 \mathrm{HS}$ is introduced into a two litre evacuated flask at $27^{\circ} \mathrm{C}, 20 \%$...

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Q JEE-MAIN 2021

The equilibrium constant Kc at 298 K for the reaction $\mathrm{A}+\mathrm{B} \rightleftharpoons \mathrm{C}+\mathrm{D}$ is 100 . Starting with an equimolar...

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Q JEE MAIN 2019

What will be the major product in the following mononitration reaction?

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Q JEE MAIN 2019

$5.1 \mathrm{~g} \mathrm{NH}_4 \mathrm{SH}$ is introduced in 3.0 L evacuated flask at $327^{\circ} \mathrm{C} .30 \%$ of the solid $...

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Q JEE MAIN 2021

The number of moles of $\mathrm{NH}_3$, that must be added to 2 L of $0.80 \mathrm{M} \mathrm{AgNO}_3$ in order to...

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Q JEE MAIN _2021

The equilibrium constant for the reaction $$ \mathrm{A}(\mathrm{~S}) \rightleftharpoons \mathrm{M}(\mathrm{~s})+\frac{1}{2} \mathrm{O}_2(\mathrm{~g}) $$ is $\mathrm{K}_p=4$. At equilibrium, the partial pressure of...

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Q JEE MAIN 2021

The number of nitrogen atoms in a semicarbazone molecule of acetone is _________.

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Q JEE MAIN 2021

Value of KP for the equilibrium reaction $\mathrm{N}_2 \mathrm{O}_4(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NO}_{2(\mathrm{~g})}$ at 288 K is 47.9. The $\mathrm{K}_{\mathrm{C}}$ for...

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Q JEE MAIN 2021

For the reaction $A+B \rightleftharpoons 2 C$ the value of equilibrium constant is 100 at 298 K . If the...

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Q JEE MAIN 2021

$\mathrm{PC}_1 \rightleftharpoons \mathrm{PCl}_3+\mathrm{Cl}_3 \mathrm{~K}_{\mathrm{c}}=1.844$ 3.0 moles of $\mathrm{PCl}_5$ is introduced in a 1 L closed reaction vessel at 380 K...

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Q JEE MAIN 2019

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Q JEE MAIN 2021

The gas phase reaction $2 \mathrm{~A}(\mathrm{~g}) \rightleftharpoons \mathrm{A}_2(\mathrm{~g})$ at $400 \mathrm{~K}_{\text {has }} \Delta \mathrm{G}^0=+25.2 \mathrm{~kJ} \mathrm{~mol}^{-1}$. The equilibrium constant...

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Q JEE MAIN 2022

At 298 K , the equilibrium constant is $2 \times 10^{15}$ for the reaction: $$ \mathrm{Cu}(\mathrm{~s})+2 \mathrm{Ag}^{+}(\mathrm{aq}) \rightleftharpoons \mathrm{Cu}^{2+}(\mathrm{aq})+2 \mathrm{Ag}(\mathrm{~s})...

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Q JEE MAIN 2022

The reaction occurring as below comes to equilibrium under a total pressure of 1 atm. Analysis of the system shows...

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Q JEE MAIN 2022

$$ \mathrm{Cu}(\mathrm{~s})+\mathrm{Sn}^{2+}(0.001 \mathrm{M}) \rightarrow \mathrm{Cu}^{2+}(0.01 \mathrm{M})+\mathrm{Sn}(\mathrm{~s}) $$ The Gibbs free energy change for the above reaction at 298 K is...

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Q JEE MAIN 2022

$40^{\circ}$ of HI undergoes decomposition to $\mathrm{H}_2$ and $\mathrm{I}_2$ at $300 \mathrm{~K} . \Delta \mathrm{G}^{\ominus}$ for this decompostion reaction at...

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Q JEE MAIN 2022

4.0 moles of argon and 5.0 moles of $\mathrm{PCl}_5$ are introduced into an evacuated flask of 100 litre capacity at...

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Q JEE-Main 2022

$\mathrm{PCl}_5$ dissociates as $$ \mathrm{PCl}_5(\mathrm{~g}) \rightleftharpoons \mathrm{PCl}_3(\mathrm{~g})+\mathrm{Cl}_2(\mathrm{~g}) $$ 5 moles of PCl 5 are placed in a 200 litre vessel...

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Q JEE-Main 2022

$$ 2 \mathrm{O}_3(\mathrm{~g}) \rightleftharpoons 3 \mathrm{O}_2(\mathrm{~g}) $$ At 300 K , ozone is fifty percent dissociated. The standard free energy...

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Q JEE MAIN 2022

$2 \mathrm{NOCl}(\mathrm{g}) \rightleftharpoons 2 \mathrm{NO}(\mathrm{g})+\mathrm{Cl}_2(\mathrm{~g})$ In an experiment, 2.0 moles of NOCl was placed in a one-litre flask and the...

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Q JEE MAIN 2022

The standard free energy change ( $\Delta \mathrm{G}^{\circ}$ ) for $50 \%$ dissociation of $\mathrm{N}_2 \mathrm{O}_4$ into $\mathrm{NO}_2$ at $...

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Q JEE-Main 2022

For a reaction at equilibrium $$ \mathrm{A}(\mathrm{~g}) \rightleftharpoons \mathrm{B}(\mathrm{~g})+\frac{1}{2} \mathrm{C}(\mathrm{~g}) $$ the relation between dissociation constant (K), degree of dissociation...

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Q JEE MAIN 2024

The following concentrations were observed at 500 K for the formation of $\mathrm{NH}_3$ from $\mathrm{N}_2$ and $\mathrm{H}_2$. At equilibrium :...

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Q JEE MAIN 2024

In the following circuit, the battery has an emf of 2 V and an internal resistance of $\frac{2}{3} \Omega$. The...

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Q JEE MAIN 2025

The equilibrium constant for decomposition of $\mathrm{H}_2 \mathrm{O}$ (g) $\mathrm{H}_2 \mathrm{O}(\mathrm{g}) \rightleftharpoons \mathrm{H}_2(\mathrm{~g})+\frac{1}{2} \mathrm{O}_2(\mathrm{~g})\left(\Delta \mathrm{G}^{\circ}=92.34 \mathrm{~kJ} \mathrm{~mol}^{-1}\right)$ is $...

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Q JEE MAIN 2025

Given below are two statements: Statement I : When a system containing ice in equilibrium with water (liquid) is heated,...

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Q JEE MAIN 2023

4.5 moles each of hydrogen and iodine is heated in a sealed ten litre vessel. At equilibrium, 3 moles of...

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Q JEE MAIN 2023

$\mathrm{A}(\mathrm{g}) \rightleftharpoons 2 \mathrm{~B}(\mathrm{~g})+\mathrm{C}(\mathrm{g})$ For the given reaction, if the initial pressure is 450 mm Hg and the pressure at...

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Q JEE MAIN 2023

The equilibrium composition for the reaction $\mathrm{PCl}_3+\mathrm{Cl}_2 \rightleftharpoons \mathrm{PCl}_5$ at 298 K is given below: $$ \begin{aligned} & {\left[\mathrm{PCl}_3\right]_{\mathrm{leq}}=0.2 \mathrm{~mol}...

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Q JEE MAIN 2023

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Q JEE MAIN 2023

A. During charging of battery, PbSO4 on anode is converted into $\mathrm{PbO}_2$ . B. During charging of battery, PbSO4 on...

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Q JEE MAIN 2023

KMnO4 is titrated with ferrous ammonium sulphate hexahydrate in presence of dilute H2SO4. Number of water molecules produced for 2...

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Q JEE MAIN 2023

A mixture of 1 mole of $\mathrm{H}_2 \mathrm{O}$ and 1 mole of CO is taken in a 10 litre container...

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Q JEE MAIN 2023

The number of correct statement/s involving equilibria in physical process from the following is (A) Equilibrium is possible only in...

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Q JEE MAIN 2023

For a concentrated solution of a weak electrolyte $\left(\mathrm{K}_{\text {eq }}=\right.$ equilibrium constant $) \mathrm{A}_2 \mathrm{~B}_3$ of concentration ‘c’, the...

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Q JEE MAIN 2023

For reaction : $\mathrm{SO}_2(\mathrm{~g})+\frac{1}{2} \mathrm{O}_2(\mathrm{~g}) \rightleftharpoons \mathrm{SO}_3(\mathrm{~g}), \mathrm{K}_{\mathrm{P}}=2 \times 10^{12}$ at $27^{\circ} \mathrm{C}$ and 1 atm pressure. The $\mathrm{K}_{\mathrm{c}}$ for...

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Q JEE MAIN 2023

Which one of the following statements is correct for electrolysis of brine solution?

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Q JEE MAIN 2023

Water decomposes at 2300 K $\mathrm{H}_2 \mathrm{O}(\mathrm{g}) \rightarrow \mathrm{H}_2(\mathrm{~g})+\frac{1}{2} \mathrm{O}_2(\mathrm{~g})$ The percent of water decomposing at 2300 K and 1...

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Q JEE MAIN 2024

For the given reaction, choose the correct expression of $\mathrm{K}_{\mathrm{C}}$ from the following :- $\mathrm{Fe}_{(\mathrm{aq})}^{3+}+\mathrm{SCN}_{(\mathrm{aq})}^{-} \rightleftharpoons\left(\mathrm{FeSCN)}_{(\mathrm{aq})}^{2+}\right.$

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Q JEE MAIN 2024

At $-20^{\circ} \mathrm{C}$ and 1 atm pressure, a cylinder is filled with equal number of $\mathrm{H}_2 . \mathrm{I}_2$ and HI...

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Q JEE MAIN 2024

For the given hypothetical reactions, the equilibrium constants are as follows: The equilibrium constant for the reaction X⇌W is

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Q JEE MAIN 2024

The following reaction occurs in the Blast furnance where iron ore is reduced to iron metal Using the Le-chatelier's principle,...

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Q JEE MAIN 2024

For the reaction N_2 O_4 (" " g)⇌2NO_2 (" " g), K_p=0.492" " atm at 300" " K.K_c for the...

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Q JEE MAIN 2025

Consider the following chemical equilibrium of the gas phase reaction at a constant temperature : $A(g) \rightleftharpoons B(g)+C(g)$ If $p$...

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Q JEE MAIN 2025

Consider the equilibrium[0pt] $\mathrm{CO}(\mathrm{g})+3 \mathrm{H}_{2}(\mathrm{~g}) \rightleftharpoons \mathrm{CH}_{4}(\mathrm{~g})+\mathrm{H}_{2} \mathrm{O}(\mathrm{g})$ If the pressure applied over the system increases by two fold at...

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Q JEE MAIN 2025

At the sea level, the dry air mass percentage composition is given as nitrogen gas: 70.0, oxygen gas: 27.0 and...

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Q JEE MAIN 2025

Given below are two statements: Statement I : A catalyst cannot alter the equilibrium constant of the reaction, temperature remaining...

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Q JEE MAIN 2025

In the following system, $\mathrm{PCl}_5(\mathrm{~g}) \leftrightharpoons \mathrm{PCl}_3(\mathrm{~g})+\mathrm{Cl}_2(\mathrm{~g})$ at equilibrium, upon addition of xenon gas at constant T & p, the...

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Q JEE MAIN 2025

For the reaction, $\mathrm{H}_{2}(\mathrm{~g})+\mathrm{I}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{HI}(\mathrm{g})$ Attainment of equilibrium is predicted correctly by :

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Q JEE MAIN 2025

Consider the following equilibrium, $\mathrm{CO}(\mathrm{~g})+2 \mathrm{H}_2(\mathrm{~g}) \rightleftharpoons \mathrm{CH}_3 \mathrm{OH}(\mathrm{~g})$ 0.1 mol of CO along with a catalyst is present in...

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Q JEE MAIN 2025

Consider the reaction $\mathrm{X}_{2} \mathrm{Y}(\mathrm{g}) \rightleftharpoons \mathrm{X}_{2}(\mathrm{~g})+\frac{1}{2} \mathrm{Y}_{2}(\mathrm{~g})$. The equation representing correct relationship between the degree of dissociation $(x)$ of...

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Q JEE MAIN 2025

At temperature T, compound ${\rm{A}}{{\rm{B}}_{2(\;{\rm{g}})}}$ dissociates as ${\rm{A}}{{\rm{B}}_{2(\;{\rm{g}})}}$ ⇌ ${\rm{AB}}({\rm{g}}) + \frac{1}{2}\;{{\rm{B}}_{2(\;{\rm{g}})}}$ having degree of dissociation x (small compared to...

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Q JEE MAIN 2025

Ice and water are placed in a closed container at a pressure of 1 atm and temperature 273.15 K ....

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Q JEE MAIN 2025

$37.8\;{\rm{g}}\;{{\rm{N}}_2}{{\rm{O}}_5}$ was taken in a 1 L reaction vessel and allowed to undergo the following reaction at 500 K $2\;{{\rm{N}}_2}{{\rm{O}}_{5(\:{\rm{g}})}}$...

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Q JEE MAIN 2025

For a reaction, ${{\rm{N}}_2}{{\rm{O}}_{5(\;{\rm{g}})}} \to 2{\rm{N}}{{\rm{O}}_{2(\;{\rm{g}})}} + \frac{1}{2}{{\rm{O}}_{2(\;{\rm{g}})}}$ in a constant volume container, no products were present initially. The final...

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Q JEE MAIN 2025

A vessel at 1000 K contains ${\rm{C}}{{\rm{O}}_2}$ with a pressure of 0.5 atm . Some of ${\rm{C}}{{\rm{O}}_2}$ is converted into...

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