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Chemical Equilibrium — NEET UG Chemistry PYQs

448 previous year questions from Chemical Equilibrium with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

448 questionsChemistrySolutions on every page
1

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

MHT CET Medical 2026 Solution View → 2

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

NEET 2026 Solution View → 3

Higher yield of NO in N ₂( ~g )+ O ₂( ~g ) 2 NO ( g ) can be obtained at [ H of the reaction =+180.7 ~kJ ~mol ⁻¹ ] A. higher temperature B. lower temperature C. higher concentratio

NEET 2025 Solution View → 4

For the reaction A ( g ) 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 : R =0.0831 ~L

NEET 2025 Solution View → 5

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 ) N _ 2( ~g ) + O _ 2( ~g )

NEET 2024 Solution View → 6

For the reaction 2 ~A 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 correct?

NEET 2024 Solution View → 7

For the reaction in equilibrium N ₂( ~g )+3 H ₂( ~g ) 2 NH ₃( ~g ), H =- Q Reaction is favoured in forward direction by:

NEET 2024 Solution View → 8

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

NEET 2024 Solution View → 9

At a given temperature and pressure, the equilibrium constant values for the equilibria are given below: 3 ~A ₂+ B ₂ 2 ~A ₃ ~B , ~K ₁ A ₃ ~B 3 2 ~A ₂+ 1 2 ~B ₂, ~K ₂ The relation b

NEET 2024 Solution View → 10

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

NEET 2022 Solution View → 11

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

NEET 2022 Solution View → 12

In which of the following reactions K_p>K_c ?

AIIMS 2019 Solution View → 13

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) 2 SO _ 2(g) + O _ 2(g) At equilibrium, 0.6 moles of SO ₂ had

AIIMS 2018 Solution View → 14

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

AIIMS 2018 Solution View → 15

When pressure is increased at constant temperature

AIIMS 2018 Solution View → 16

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

AIIMS 2018 Solution View → 17

In the given reaction : A+2 B 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.

AIIMS 2018 Solution View → 18

The value of K _ C for the reaction, 2 ~A 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, the reaction wi

JIPMER 2018 Solution View → 19

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

JIPMER 2018 Solution View → 20

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 = -

NEET 2018 Solution View → 21

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

AIIMS 2017 Solution View → 22

The equilibrium constants of the following are: N 2 + 3 H 2 ⇌ 2   NH 3 K 1 N 2 + O 2 ⇌ 2   NO K 2 H 2 + 1 2 O 2 → H 2 O   K 3 The equilibrium const

NEET 2017 Solution View → 23

Which one of the following statements is not correct?

NEET 2017 Solution View → 24

Both Mg and Fe metal can reduce copper from a solution having Cu ²⁺ ion, according to equilibria. aligned & Mg _ (s) + Cu ²⁺ Mg ²⁺+ Cu _ (s) ; K₁=6 10⁹⁰ & Fe _ (s) + Cu ²⁺ Fe ²⁺+ C

JIPMER 2016 Solution View → 25

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) 2 SO _ 2(g) + O _ 2(g) If 0.6 moles of

AIIMS 2015 Solution View → 26

For the following equilibrium (omitting charges) I. M+ Cl M Cl , K_ eq = ₁ II. M C l+ Cl M C l₂, K_ eq = ₂ III. M Cl ₂+ Cl MCl ₃, K_ eq = ₃ IV. M+3 Cl M Cl ₃, K_ eq =K then relatio

JIPMER 2015 Solution View → 27

aligned & If Ag ⁺+2 NH ₃ Ag ( NH ₃ )₂⁺ ; K₁=1.7 10^7 & Ag ⁺+ Cl ⁻ AgCl ; K₂=5.4 10^9 aligned Then, for AgCl +2 NH ₃ [ Ag ( NH ₃ )₂ ]⁺+ Cl ⁻ equilibrium constant will be

JIPMER 2015 Solution View → 28

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

NEET 2015 Solution View → 29

If the equilibrium constant for N 2 g + O 2 ( g ) ⇌ 2 N O ( g ) is K, the equilibrium constant for 1 2 N 2 g + 1 2 O 2 ( g ) ⇌ N O ( g ) will be:

NEET 2015 Solution View → 30

The equilibrium constant for the reaction, 1 2 H _ 2(g) + 1 2 I _ 2(g) HI _ (g) is K_c . Equilibrium constant for the reaction, 2 HI _ (g) H _ 2(g) + I _ 2(g) will be

AIIMS 2014 Solution View → 31

For the reaction, N ₂( ~g )+ O ₂( ~g ) 2 NO ( g ) , the equilibrium constant is K₁ . The equilibrium constant is K₂ for the reaction, 2 NO ( g )+ O ₂( ~g ) 2 NO ₂( ~g ) . What is K

JIPMER 2014 Solution View → 32

The dissociation equilibrium of a gas A B₂ can be represented as 2 A B₂(g) 2 A B(g)+B₂(g) The degree of dissociation is ' x ' and is small compared to 1 . The expression relating t

JIPMER 2014 Solution View → 33

For the reversible reaction: N 2 g + 3 H 2 g ⇌ 2 N H 3 g + h e a t The equilibrium shifts in forward direction:

NEET 2014 Solution View → 34

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 constant in

NEET 2014 Solution View → 35

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

JIPMER 2013 Solution View → 36

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 rela

JIPMER 2013 Solution View → 37

The value of K_c for the reaction, 2 A 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?

JIPMER 2013 Solution View → 38

At 60^ and 1 ~atm , ~N ₂ O ₄ is 50 % dissociated into NO ₂ then K_p is

AIIMS 2012 Solution View → 39

K_p K_c for following reaction will be

AIIMS 2012 Solution View → 40

For the homogeneous reaction, NH ₃+ OCl ⁻ N ₂ H ₄+ Cl ⁻ the equilibrium constant K_c has the units

JIPMER 2012 Solution View → 41

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

NEET 2012 Solution View → 42

Given the reaction between two gases represented by A₂ and B₂ to give the compound A B(g) . A₂(g)+B₂(g) 2 A B(g) At equilibrium, the concentration of A₂=3.0 10⁻³ M of B₂=4.2 10⁻³ M

NEET 2012 Solution View → 43

Which of the following is not a characteristic of equilibrium?

AIIMS 2011 Solution View → 44

The value of H for the raction X₂(g)+4 Y₂(g)³⁹ 2 X Y₄(g) is less than zero. Formation of X Y₄(g) will be favoured at

NEET 2011 Solution View → 45

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

NEET 2011 Solution View → 46

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 mixt

AIIMS 2010 Solution View → 47

In which of the following equilibrium K _C and K _ P are not equal ?

NEET 2010 Solution View → 48

The reaction, (2 ~A _ ( g ) + B _ ( g ) 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 reached,

NEET 2010 Solution View → 49

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) 2 SO _ 2(g) + O _ 2(g) . At equilibrium, 0.6 moles of SO ₂ h

AIIMS 2009 Solution View → 50

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

AIIMS 2009 Solution View → 51

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

AIIMS 2009 Solution View → 52

In III group precipitation, NH ₄ Cl is added before adding NH ₄ OH to

JIPMER 2009 Solution View → 53

9.2 ~g ~N ₂ O ₄ is heated in a 1 L vessel till equilibrium state is established N ₂ O ₄(g) 2 NO ₂(g) In equilibrium state 50 % ~N ₂ O ₄ was dissociated, equilibrium constant will b

JIPMER 2009 Solution View → 54

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

JIPMER 2009 Solution View → 55

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 HCN + CH ₃ COO

NEET 2009 Solution View → 56

The dissociation equilibrium of a gas (A B₂ ) can be represented as [ 2 A B_ 2(g) 2 A B_ (g) +B_ 2(g) ] The degree of dissociation is (x ) and is small compared to 1 . The expressi

AIIMS 2008 Solution View → 57

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

AIIMS 2008 Solution View → 58

Solubility product of ( PbCl ₂ ) at 298 K is (1 10⁻⁶ ). At this temperature solubility of ( PbCl ₂ ) in ( mol / L ) is

JIPMER 2008 Solution View → 59

Bond dissociation enthalpy of H ₂, Cl ₂ and HCl Enthalpy of formation of HCl is

NEET 2008 Solution View → 60

If the concentration of OH ⁻ ions in the reaction Fe ( OH )₃(s) Fe ³⁺(a q)+3 OH (a q) is decreased by 1 4 times, then equilibrium concentration of Fe ³⁺ will increase by

NEET 2008 Solution View → 61

If the concentration of OH ⁻ ions in the reaction Fe ( OH )₃( ~s ) Fe ³⁺( aq )+3 OH ⁻( aq ) is decreased by 1 4 times, then equilibrium concentration of Fe ³⁺ will increase by

NEET 2008 Solution View → 62

The value of equilibrium constant of the reaction HI ( g ) 1 2 H ₂( ~g )+ 1 2 I ₂ is 8.0 The equilibrium constant of the reaction H ₂( ~g )+ I ₂( ~g ) 2 HI ( g ) will be

NEET 2008 Solution View → 63

The values of K_ P 1 and K_ P 2 for the reactions aligned & X Y+Z . & A 2 B . . aligned are in ratio of 9:1. If degree of dissociation of X and A be equal, then total pressure at e

NEET 2008 Solution View → 64

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

NEET 2008 Solution View → 65

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 mix

AIIMS 2007 Solution View → 66

Equilibrium constants K₁ and K₂ for the following equilibria NO (g)+ 1 2 O ₂ K₁ NO ₂(g) and 2 NO ₂(g) K₂ 2 NO (g)+ O ₂(g) are related as

JIPMER 2007 Solution View → 67

The following equilibrium constant are given: aligned N ₂+3 H ₂ & 2 NH ₃ ; K ₁ ~N ₂+ O ₂ & 2 NO ; K ₂ H ₂+1 / 2 O ₂ & H ₂ O ; K ₃ aligned The equilibrium constant for the oxidation

NEET 2007 Solution View → 68

A+B 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 equilibrium constant of

JIPMER 2006 Solution View → 69

For the reaction: CH _ 4(g) +2 O _ 2(g) CO _ 2(g) +2 H ₂ O (l) H _r=-170.8 ~kJ ~mol ⁻¹ . Which of the following statements is not true?

NEET 2006 Solution View → 70

For reaction, 2 NOCl _ (g) 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

AIIMS 2005 Solution View → 71

For the chemical equilibrium, CaCO _ 3(s) CaO _ (s) + CO _ 2(g) , H_r^ can be determined from which one of the following plots?

AIIMS 2005 Solution View → 72

Equilibrium constants K ₁ and K ₂ for the following equilibria: are related as:

NEET 2005 Solution View → 73

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

AIIMS 2004 Solution View → 74

For the reaction, 2 NO ₂ 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

JIPMER 2004 Solution View → 75

The reaction quotient ( Q ) for the reaction: N _ 2(g) +3 H _ 2(g) 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:

NEET 2003 Solution View → 76

The following equilibrium are given: array ll N ₂+3 H ₂ 2 NH ₃ & ~K ₁ ~N ₂+ O ₂ 2 NO & K ₂ H ₂+ 1 2 O ₂ H ₂ O & K ₃ array The equilibrium constant of the reaction 2 NH ₃+ 5 2 O ₂ 2

NEET 2003 Solution View → 77

For the reaction BaO ₂(s) BaO (s)+ O ₂(g) ; H =+ ve . In an equilibrium condition, pressure of O ₂ depends on:

NEET 2002 Solution View → 78

In which of the following reaction K_p>K_c ?

AIIMS 2001 Solution View → 79

Which of the following is a characteristic of a reversible reaction?

AIIMS 2001 Solution View → 80

What is the condition of equilibrium in terms of the rate of opposing processes?

NEET Solution View → 81

What does it mean when ∆G is equal to 0 for a reaction?

NEET Solution View → 82

What is the standard state (c 0 ) for a solute when measuring concentrations with respect to it?

NEET Solution View → 83

What is the term used to describe a mixture of reactants and products in the equilibrium state?

NEET Solution View → 84

What happens to the rates of forward and reverse reactions at equilibrium?

NEET Solution View → 85

What does maximum yield of products imply in terms of temperature and pressure conditions?

NEET Solution View → 86

Which type of reaction involves reactants and products in different phases?

NEET Solution View → 87

How do molecules escape the liquid surface during evaporation in a closed container?

NEET Solution View → 88

What is the term used for a chemical reaction that can proceed in both the forward and reverse directions?

NEET Solution View → 89

How is the concentration expressed in mol/m3 calculated from the ideal gas equation when pressure is in pascals (Pa)?

NEET Solution View → 90

What happens to the mass of ice and water when they are not in equilibrium?

NEET Solution View → 91

What happens to the equilibrium when an inert gas like argon is added at constant volume to a reaction?

NEET Solution View → 92

What determines the concentration of the solute in a saturated solution?

NEET Solution View → 93

How can a pressure change affect the yield of products in a gaseous reaction?

NEET Solution View → 94

What characterizes the dynamic nature of chemical equilibrium?

NEET Solution View → 95

In the context of a reaction with an exceedingly small K, what is the role of a catalyst?

NEET Solution View → 96

Why does the addition of an inert gas at constant volume not disturb the equilibrium?

NEET Solution View → 97

How is the extent of a reaction in equilibrium affected by temperature?

NEET Solution View → 98

What is the state of a chemical reaction when the rates of the forward and reverse reactions become equal?

NEET Solution View → 99

How does the equilibrium vapor pressure of iodine change with temperature?

NEET Solution View → 100

What is the primary factor that determines the classification of reactions based on their extent in equilibrium?

NEET Solution View → 101

How does the temperature affect the equilibrium constant for a given reaction?

NEET Solution View → 102

According to Le Chatelier's principle, how does a system respond to a change in equilibrium conditions?

NEET Solution View → 103

In terms of chemical equilibria, what does "net reaction" refer to?

NEET Solution View → 104

What is the composition of the mixture like when a chemical reaction reaches a state of equilibrium?

NEET Solution View → 105

How can you relate the equilibrium constant K for a reaction to the equilibrium constant of a related reaction?

NEET Solution View → 106

What does "homogeneous solution phase" refer to?

NEET Solution View → 107

What happens at the boundary between ice and water when ice and water are in equilibrium?

NEET Solution View → 108

When does equilibrium occur in the sublimation of solid iodine?

NEET Solution View → 109

For the equilibrium 2NOCl(g) ⇌ 2NO(g) + Cl 2 (g), the value of the equilibrium constant, K c is 3.75 × 10–6 at 1069 K. What is the value of K p for the reaction at this temperature

NEET Solution View → 110

What characteristic of an inert gas makes it not affect the equilibrium?

NEET Solution View → 111

What commercial application does the removal of a product have in reactions involving gases or volatile substances?

NEET Solution View → 112

Which law governs the equilibrium between the molecules of a gas and those dissolved in a liquid under pressure?

NEET Solution View → 113

What gives rise to a constant vapor pressure in a closed container during evaporation?

NEET Solution View → 114

When is the expression for the equilibrium constant applicable?

NEET Solution View → 115

What can be calculated using equilibrium constants?

NEET Solution View → 116

At what stage is the system considered to be in dynamic equilibrium?

NEET Solution View → 117

What is the significance of using deuterium in the synthesis of ammonia to demonstrate the dynamic nature of equilibrium?

NEET Solution View → 118

In which direction does the equilibrium shift when a gaseous reaction mixture is compressed to one-half of its original volume?

NEET Solution View → 119

How does changing the stoichiometric coefficients in a chemical equation affect the equilibrium constant expression?

NEET Solution View → 120

In a homogeneous system, what is the key characteristic of the phase of reactants and products?

NEET Solution View →
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