NEET PYQ Chemical Equilibrium - Chapter-wise Questions with Solutions

About Chemical Equilibrium PYQs

Chemical Equilibrium has 448 previous year questions in the Quantrex Academy NEET UG Chemistry bank. The 220 questions in this list come from NEET (177), AIIMS (24), JIPMER (18) and 1 other source, spanning 2001 to 2026. Each question opens on its own page with the options, the correct answer and the worked solution where available.

NEET Chemical Equilibrium PYQs with Solutions

About Chemical Equilibrium PYQs

Questions by year (this list)

Chemical Equilibrium questions with solutions

For which of the following solids does solubility decrease with an increase in temperature?

Given below are certain reactions. Identify the reaction for which K_p ≠ K_c :

Higher yield of NO in N_2(~g)+O_2(~g) leftharpoons 2 NO(g) can be obtained at [ Δ H of the reaction =+180.7 ~kJ ~mol^ -1 ] A. higher temperature B. lower temperature C. higher

For the reaction A(g) leftharpoons 2 ~B(~g) , the backward reaction rate constant is higher than the forward reaction rate constant by a factor of 2500 , at 1000 K . [Given

Consider the following reaction in a sealed vessel at equilibrium with concentrations of N_2=3.0 × 10^ -3 M, O_2=4.2 × 10^ -3 M and NO=2.8 × 10^ -3 M . 2 NO_ (g) leftharpoons N_

For the reaction 2 ~A leftharpoons B+C, K_ C =4 × 10^ -3 . At a given time, the composition of reaction mixture is: [A]=[B]=[C]=2 × 10^ -3 M . Then, which of the following is

For the reaction in equilibrium N_2(~g)+3 H_2(~g) leftharpoons 2 NH_3(~g), Δ H=-Q Reaction is favoured in forward direction by:

In which of the following equilibria, K_ p and K_ c are NOT equal?

At a given temperature and pressure, the equilibrium constant values for the equilibria are given below: 3 ~A_2+B_2 leftharpoons 2 ~A_3 ~B, ~K_1 A_3 ~B leftharpoons (3)/(2)

K_P for the following reaction is 3.0 at 1000 ~K . CO_2(~g)+C(s) leftharpoons 2 CO(g) What will be the value of K_C for the reaction at the same temperature? (Given: R=0.083 ~L

3 O _ 2 ( g ) ⇌ 2 O _ 3 ( g ) for the above reaction at 298K, K _ c is found to be 3 . 0 × 10 ^ - 59 . If the concentration of O _ 2 at equilibrium is 0 . 040M then concentration

In which of the following reactions K_p>K_c ?

A vessel of one litre capacity containing 1 mole of SO_3 is heated till a state of equilibrium is attained. 2 SO_ 3(g) leftharpoons 2 SO_ 2(g) +O_ 2(g) At equilibrium, 0.6 moles

Assertion : Solubility of gases increases with increase in pressure. Reason : Dissolution of gas in liquid is exothermic.

When pressure is increased at constant temperature

If for the reaction, 2 ICl I_2+Cl_2 ; K_c=0.14 and initial concentration of ICl is 0.6 M then equilibrium concentration of I_2 is

In the given reaction : A+2 B leftharpoons 2 C 2 moles each of A and B present in 10 ~L of solution combine to form 1 mole of C . Calculate K_c for the reaction.

The value of K_ C for the reaction, 2 ~A leftharpoons B+C is 2 × 10^ -3 . At a given time, the composition of reaction mixture is [A]=[B]=[C]=3 × 10^ -4 M . In which direction

A chemical reaction was carried out at 300 K and 280 K . The rate constant were found to be k_1 and k_2 respectively, then

Which one of the following conditions will favor the maximum formation of the product in the reaction? A _ 2 (g) + B _ 2 (g) ⇌ X _ 2 (g) Δ _ r H = - XkJ

For the reaction, H_2+I_2 leftharpoons 2 HI, K=47.6 . If the initial number of moles of each reactant and product is 1 mole then at equilibrium

The equilibrium constants of the following are: cases N _ 2 + 3 H _ 2 ⇌ 2 NH _ 3 & K _ 1 N _ 2 + O _ 2 ⇌ 2NO & K _ 2 H _ 2 + (1)/(2) O _ 2 → H _ 2 O & K _ 3 cases The equilibrium

Which one of the following statements is not correct?

Both Mg and Fe metal can reduce copper from a solution having Cu^ 2+ ion, according to equilibria. aligned & Mg_ (s) +Cu^ 2+ leftharpoons Mg^ 2+ +Cu_ (s) ; K_1=6 × 10^ 90 & Fe_

One mole of SO_3 was placed in a vessel of 1 ~L capacity at a certain temperature and the following equilibrium was established. 2 SO_ 3(g) leftharpoons 2 SO_ 2(g) +O_ 2(g) If 0.6

For the following equilibrium (omitting charges) I. M+Cl M Cl, K_ eq =β_1 II. M C l+Cl M C l_2, K_ eq =β_2 III. M Cl_2+Cl MCl_3, K_ eq =β_3 IV. M+3 Cl M Cl_3, K_ eq =K then

aligned & If Ag^ + +2 NH_3 leftharpoons Ag(NH_3)_2^ + ; K_1=1.7 × 10^7 & Ag^ + +Cl^ - leftharpoons AgCl ; K_2=5.4 × 10^9 aligned Then, for AgCl+2 NH_3 leftharpoons[Ag(NH_3)_2]^ +

If the value of an equilibrium constant for a particular reaction is 1.6 × 10 ^ 12 , then at equilibrium the system will contain:

If the equilibrium constant for N _ 2 (g) + O _ 2 ( g ) ⇌ 2NO ( g ) is K, the equilibrium constant for (1)/(2) N _ 2 (g) + (1)/(2) O _ 2 ( g ) ⇌ NO ( g ) will be:

The equilibrium constant for the reaction, (1)/(2) H_ 2(g) +(1)/(2) I_ 2(g) leftharpoons HI_ (g) is K_c . Equilibrium constant for the reaction, 2 HI_ (g) leftharpoons H_ 2(g) +I_

For the reaction, N_2(~g)+O_2(~g) leftharpoons 2 NO(g) , the equilibrium constant is K_1 . The equilibrium constant is K_2 for the reaction, 2 NO(g)+O_2(~g) leftharpoons 2

The dissociation equilibrium of a gas A B_2 can be represented as 2 A B_2(g) leftharpoons 2 A B(g)+B_2(g) The degree of dissociation is ' x ' and is small compared to 1 . The

For the reversible reaction: N _ 2 (g) + 3 H _ 2 (g) ⇌ 2N H _ 3 (g) + heat The equilibrium shifts in forward direction:

For a given exothermic reaction K _ p and K' _ p are the equilibrium constants at temperatures T _ 1 and T _ 2 respectively (T 2 .>T 1 ). Assuming that heat of reaction is

At equilibrium, the rate of dissolution of a solid solute in a volatile liquid solvent is

The rate of a gaseous reaction is given by the expression k[A][B] . If the volume of the reaction vessel is suddenly reduced to (1)/(4) th of the initial volume, the reaction rate

The value of K_c for the reaction, 2 A leftharpoons B+C is 2 × 10^ -3 . At a given time, if the composition of reaction mixture is [A]=[B]=[C]=3 × 10^ -3 M . Which is true?

At 60^ ∘ and 1 ~atm, ~N_2 O_4 is 50 \% dissociated into NO_2 then K_p is

(K_p)/(K_c) for following reaction will be

For the homogeneous reaction, NH_3+OCl^ - N_2 H_4+Cl^ - the equilibrium constant K_c has the units

Given that the equilibrium constant for the reaction, 2 SO _ 2 (g)+ O _ 2 (g) leftharpoons 2 SO _ 3 (g) has a value of 278 at a particular temperature. What is the value of the

Given the reaction between two gases represented by A_2 and B_2 to give the compound A B(g) . A_2(g)+B_2(g) leftharpoons 2 A B(g) At equilibrium, the concentration of A_2=3.0 ×

Which of the following is not a characteristic of equilibrium?

The value of Δ H for the raction X_2(g)+4 Y_2(g)^ 39 2 X Y_4(g) is less than zero. Formation of X Y_4(g) will be favoured at

For the reaction, \(N _ 2 ( g)+O _ 2 ( g) leftharpoons 2 NO(g)\), the equilibrium constant is \(K _ 1 \). The equilibrium constant is \( K _ 2 \) for \(2 NO(g)+O _ 2 ( g)

Assertion : The equilibrium constant is fixed and a characteristic for any given chemical reaction at a specified temperature. Reason: The composition of the final equilibrium

In which of the following equilibrium K_C and K_ P are not equal ?

The reaction, \(2 ~A_ (g) +B_ (g) rightharpoons 3 C_ (g) +D_ (g) \) is begun with the concentrations of \(A\) and \(B\) both at an initial value of 1.00 M When equilibrium is

A vessel of one litre capacity containing 1 mole of SO_3 is heated till a state of equilibrium is attained. 2 SO_ 3(g) leftharpoons 2 SO_ 2(g) +O_ 2(g) . At equilibrium, 0.6 moles

The equilibrium constant for mutarotation α -D Glucose leftharpoons β -D Glucose is 1.8 . What percentage of α form remains at equilibrium?

Assertion : Ice leftharpoons water, if pressure is applied water will evaporate. Reason : Increases of pressure pushes the equilibrium towards the side in which number of gaseous

In III group precipitation, NH_4 Cl is added before adding NH_4 OH to

9.2 ~g ~N_2 O_4 is heated in a 1 L vessel till equilibrium state is established N_2 O_4(g) leftharpoons 2 NO_2(g) In equilibrium state 50 \% ~N_2 O_4 was dissociated, equilibrium

What is the equation for the equilibrium constant (K_c) for the following reaction? (1)/(2) A(g)+(1)/(3) B(g) T(K) leftharpoons (2)/(3) C(g)

The dissociation constants for acetic acid and HCN at 25^ ∘ C are 1.5 × 10^ -5 and 4.5 × 10^ -10 , respectively. The equilibrium constant for the equilibrium, CN^ - +CH_3 COOH

The dissociation equilibrium of a gas \(A B_2\) can be represented as \[ 2 A B_ 2(g) leftharpoons 2 A B_ (g) +B_ 2(g) \] The degree of dissociation is \(x\) and is small compared

Assertion : According to Le-Chatelier's principle addition of heat to an equilibrium solid \(leftharpoons\) liquid results in decrease in the amount of solid. Reason : Reaction is

Solubility product of \(PbCl_2\) at 298 K is \(1 × 10^ -6 \). At this temperature solubility of \(PbCl_2\) in \(mol / L\) is

Bond dissociation enthalpy of H_2, Cl_2 and HCl Enthalpy of formation of HCl is

If the concentration of OH^ - ions in the reaction Fe(OH)_3(s) leftharpoons Fe^ 3+ (a q)+3 OH(a q) is decreased by (1)/(4) times, then equilibrium concentration of Fe^ 3+ will

If the concentration of OH^ - ions in the reaction Fe(OH)_3(~s) leftharpoons Fe^ 3+ (aq)+3 OH^ - (aq) is decreased by (1)/(4) times, then equilibrium concentration of Fe^ 3+ will

The value of equilibrium constant of the reaction HI(g) leftharpoons (1)/(2) H _ 2 ( ~g)+(1)/(2) I _ 2 is 8.0 The equilibrium constant of the reaction H_2(~g)+I_2(~g) leftharpoons

The values of K_ P 1 and K_ P 2 for the reactions aligned & X leftharpoons Y+Z . & A leftharpoons 2 B . . aligned are in ratio of 9:1. If degree of dissociation ofX and A be

The dissociation equilibrium of a gas AB_2 can be represented as, 2 AB_2(~g) leftharpoons 2 AB(g)+B_2(~g) . The degree of dissociation is ' x ' and is small compared to 1. The

Assertion : The equilibrium constant is fixed and a characteristic for any given chemical reaction at a specified temperature. Reason : The composition of the final equilibrium

Equilibrium constants K_1 and K_2 for the following equilibria NO(g)+(1)/(2) O_2 K_1 leftharpoons NO_2(g) and 2 NO_2(g) K_2 leftharpoons 2 NO(g)+O_2(g) are related as

The following equilibrium constant are given: aligned N_2+3 H_2 & leftharpoons 2 NH_3 ; K_1 ~N_2+O_2 & leftharpoons 2 NO ; K_2 H_2+1 / 2 O_2 & leftharpoons H_2 O ; K_3 aligned The

A+B leftharpoons C+D . If initially the concentration of A and B are both equal but at equilibrium, concentration of D will be twice of that of A , then what will be the

For the reaction: CH_ 4(g) +2 O_ 2(g) leftharpoons CO_ 2(g) +2 H_2 O(l) Δ H_r=-170.8 ~kJ ~mol^ -1 . Which of the following statements is not true?

For reaction, 2 NOCl_ (g) leftharpoons 2 NO_ (g) +Cl_ 2(g) , K_c at 427^ ∘ C is 3 × 10^ -6 ~L ~mol ^ -1 . The value of K_p is nearly

For the chemical equilibrium, CaCO_ 3(s) leftharpoons CaO_ (s) +CO_ 2(g) , Δ H_r^ ∘ can be determined from which one of the following plots?

Equilibrium constants K_1 and K_2 for the following equilibria: are related as:

Of the following which change will shift the reaction towards the product? I_ 2(~g) leftharpoons 2 I_ (g) , Δ H_r^ ∘ (298 ~K)=+150 ~kJ

For the reaction, 2 NO_2 arrow 2 NO+O_2 , the value of K_p is equal to K . What will the value of K_p for reaction, NO+(1)/(2) O_2 NO_2

The reaction quotient (Q) for the reaction: N_ 2(g) +3 H_ 2(g) leftharpoons 2 NH_ 3(~g) is given by Q= [NH_3]^2 [~N_2][H_2]^3 The reaction will proceed from right to left if:

The following equilibrium are given: array ll N_2+3 H_2 leftharpoons 2 NH_3 & ~K_1 ~N_2+O_2 leftharpoons 2 NO & K_2 H_2+(1)/(2) O_2 leftharpoons H_2 O & K_3 array The equilibrium