What is the equilibrium constant or a reaction?

What is the equilibrium constant or a reaction?
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Determine the values of equilibrium constant (Kc) and ΔG° for the following reaction : Ni(s) + 2Ag+ (aq) → Ni2+ (aq) + 2Ag(s), E° = 1.05 V (1F = 96500 C mol-1 -Chemistry

Description : Determine the values of equilibrium constant (Kc) and ΔG° for the following reaction : Ni(s) + 2Ag+ (aq) → Ni2+ (aq) + 2Ag(s), E° = 1.05 V (1F = 96500 C mol-1 -Chemistry

Last Answer : According to the formula ΔG° = -nFE° = – 2 × 96500 ×1.05 or ΔG° = -202650 J mol-1 = -202.65 KJ mol-1 Now ΔG° ⇒ -202650 J Mol-1 R = 8.314 J/Mol/K, T = 298 K

Equilibrium constant of a reaction is elated to :

Description : Equilibrium constant of a reaction is elated to :

Last Answer : Equilibrium constant of a reaction is elated to : A. Standard free energy change `Delta G^(@)` B. ... change `Delta G` C. Entropy change D. None

For a reaction `H_(2(g))+I_(2(g))rArr2HI_((g))at 721^(@)C` the value of equilibrium constant is 50 . If 0.5 moles each of `H_(2)` & `I(2)` is added to

Description : For a reaction `H_(2(g))+I_(2(g))rArr2HI_((g))at 721^(@)C` the value of equilibrium constant is 50 . If 0.5 moles each of `H_(2)` & `I(2)` is added to

Last Answer : For a reaction `H_(2(g))+I_(2(g))rArr2HI_((g))at 721^(@)C` the value of equilibrium constant is 50 . ... constant will be . A. 100 B. 25 C. 50 D. 200

When volume of the equilibrium reaction C(s) + H2O(g) ⇌ CO(g) + H2(g) is increased at constant temperature the equilibrium will :

Description : When volume of the equilibrium reaction C(s) + H2O(g) ⇌ CO(g) + H2(g) is increased at constant temperature the equilibrium will :

Last Answer : When volume of the equilibrium reaction C(s) + H2O(g) ⇌ CO(g) + H2(g) is increased at constant ... left c. be unaltered d. can not be predicted

Enzymes increases the rate of reactions by (A) Increasing the free energy of activation (B) Decreasing the energy of activation (C) Changing the equilibrium constant of the reaction (D) Increasing the free energy change of the reaction

Description : Enzymes increases the rate of reactions by (A) Increasing the free energy of activation (B) Decreasing the energy of activation (C) Changing the equilibrium constant of the reaction (D) Increasing the free energy change of the reaction

Last Answer : Answer : B

Enzymes increase the rates of reactions by (A) Increasing the free energy of activation (B) Decreasing the energy of activation (C) Changing the equilibrium constant of the reaction (D) Increasing the free energy change of the reaction

Description : Enzymes increase the rates of reactions by (A) Increasing the free energy of activation (B) Decreasing the energy of activation (C) Changing the equilibrium constant of the reaction (D) Increasing the free energy change of the reaction

Last Answer : Answer : B

Enzymes accelerate the rate of reactions by (A) Increasing the equilibrium constant of reactions (B) Increasing the energy of activation (C) Decreasing the energy of activation (D) Decreasing the free energy change of the reaction

Description : Enzymes accelerate the rate of reactions by (A) Increasing the equilibrium constant of reactions (B) Increasing the energy of activation (C) Decreasing the energy of activation (D) Decreasing the free energy change of the reaction

Last Answer : Answer : C

if the equilibrium constant for the reaction is 4.0, what will be the equilibrium constant for the reverse reaction.

Description : if the equilibrium constant for the reaction is 4.0, what will be the equilibrium constant for the reverse reaction.

Last Answer : Ans. Kc=1/4

With increase in temperature, the equilibrium __________ rises in case of endothermic reaction. (A) Constant (B) Conversion (C) Both (A) & (B) (D) Neither (A) nor (B)

Description : With increase in temperature, the equilibrium __________ rises in case of endothermic reaction. (A) Constant (B) Conversion (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : (B) Conversion

In a reversible chemical reaction having two reactants in equilibrium, if the concentration of the reactants are doubled, then the equilibrium constant will (A) Remain the same (B) Be halved (C) Also be doubled (D) Become one fourth

Description : In a reversible chemical reaction having two reactants in equilibrium, if the concentration of the reactants are doubled, then the equilibrium constant will (A) Remain the same (B) Be halved (C) Also be doubled (D) Become one fourth

Last Answer : (A) Remain the same

The role of a catalyst in a chemical reaction is to change the (A) Equilibrium constant (B) Activation energy (C) Final products (D) Heat of reaction

Description : The role of a catalyst in a chemical reaction is to change the (A) Equilibrium constant (B) Activation energy (C) Final products (D) Heat of reaction

Last Answer : (B) Activation energy

The equilibrium constant for the reversible reaction as shown in the bellow figure, is affected by the (A) Temperature of the system (B) Presence or absence of inerts (C) Pressure of the system (D) Kinetics of the reaction

Description : The equilibrium constant for the reversible reaction as shown in the bellow figure, is affected by the (A) Temperature of the system (B) Presence or absence of inerts (C) Pressure of the system (D) Kinetics of the reaction

Last Answer : (C) Pressure of the system

Pick out the wrong statement. (A) A particular chemical reaction is more temperature sensitive at low temperatures (B) A very high value of equilibrium constant, K (K >> 1) indicates that the reaction is practically irreversible in nature (C) The intercept of the Arrhenius plot is called the 'activation energy' (D) Non-ideal flow takes place in reactors due to recycling, channeling or by creation of stagnant regions

Description : Pick out the wrong statement. (A) A particular chemical reaction is more temperature sensitive at low temperatures (B) A very high value of equilibrium constant, K (K >> 1) indicates that the ... ) Non-ideal flow takes place in reactors due to recycling, channeling or by creation of stagnant regions

Last Answer : (C) The intercept of the Arrhenius plot is called the 'activation energy

In the gaseous phase ammonia formation reaction (N2 + 3H2 ⇌ 2NH3 ), the value of the equilibrium constant depends on the (A) Total pressure of the system (B) Volume of the reactor (C) Temperature (D) Initial concentration of N2 and H2

Description : In the gaseous phase ammonia formation reaction (N2 + 3H2 ⇌ 2NH3 ), the value of the equilibrium constant depends on the (A) Total pressure of the system (B) Volume of the reactor (C) Temperature (D) Initial concentration of N2 and H2

Last Answer : (C) Temperature

Catalytic action in a catalytic chemical reaction follows from the ability of catalyst to change the (A) Activation energy (B) Equilibrium constant (C) Heat of reaction (D) None of these

Description : Catalytic action in a catalytic chemical reaction follows from the ability of catalyst to change the (A) Activation energy (B) Equilibrium constant (C) Heat of reaction (D) None of these

Last Answer : (A) Activation energy

A Catalyst (A) Increases the equilibrium concentration of the product (B) Changes the equilibrium constant of the reaction (C) Shortens the time to reach the equilibrium (D) None of these

Description : A Catalyst (A) Increases the equilibrium concentration of the product (B) Changes the equilibrium constant of the reaction (C) Shortens the time to reach the equilibrium (D) None of these

Last Answer : (C) Shortens the time to reach the equilibrium

The irreversible reaction is a special case of reversible reaction, if the(A) Equilibrium constant is 1(B) Conversion of the reactant at equilibrium condition is zero(C) Reactant concentration at equilibrium condition is zero(D) All (A), (B) and (C)

Description : The irreversible reaction is a special case of reversible reaction, if the(A) Equilibrium constant is 1 (B) Conversion of the reactant at equilibrium condition is zero (C) Reactant concentration at equilibrium condition is zero (D) All (A), (B) and (C)

Last Answer : (C) Reactant concentration at equilibrium condition is zero

A catalyst is said to be a negative catalyst, if it (A) Retards the rate of reaction (B) Reduces the value of equilibrium constant (C) Does not initiate the reaction (D) All (A), (B) and (C)

Description : A catalyst is said to be a negative catalyst, if it (A) Retards the rate of reaction (B) Reduces the value of equilibrium constant (C) Does not initiate the reaction (D) All (A), (B) and (C)

Last Answer : (A) Retards the rate of reaction

For an ideal gas mixture undergoing a reversible gaseous phase chemical reaction, the equilibrium constant(A) Is independent of pressure(B) Increases with pressure(C) Decreases with pressure(D) Increases /decreases with pressure depending on the stoichiometric co￾efficients of the reaction

Description : For an ideal gas mixture undergoing a reversible gaseous phase chemical reaction, the equilibrium constant (A) Is independent of pressure (B) Increases with pressure (C) Decreases with pressure (D) Increases /decreases with pressure depending on the stoichiometric co￾efficients of the reaction

Last Answer : (B) Increases with pressure

According to the 'law of mass action', the rate of reaction is directlyproportional to the (A) Equilibrium constant (B) Volume of the reaction vessel (C) Nature of the reactants (D) Molar concentration of the reactants

Description : According to the 'law of mass action', the rate of reaction is directlyproportional to the (A) Equilibrium constant (B) Volume of the reaction vessel (C) Nature of the reactants (D) Molar concentration of the reactants

Last Answer : (D) Molar concentration of the reactants

Pick out the correct statement. (A) A catalyst speeds up the forward reaction but slows shown the reverse reaction (B) Addition of catalyst changes the equilibrium constant (C) Pressure changes do not change the equilibrium concentrations (D) The composition of equilibrium is changed by catalyst

Description : Pick out the correct statement. (A) A catalyst speeds up the forward reaction but slows shown the reverse reaction (B) Addition of catalyst changes the equilibrium constant (C) Pressure changes do not change the equilibrium concentrations (D) The composition of equilibrium is changed by catalyst

Last Answer : (C) Pressure changes do not change the equilibrium concentrations

Pick out the correct statement. (A) A chemical reaction accompanied by absorption of heat is called an exothermic reaction (B) A chemical reaction accompanied by evolution of heat is called an endothermic reaction (C) The rate constant for a first order reaction does not change on changing the concentration units (D) Chemical equilibrium state is dynamic in nature

Description : Pick out the correct statement. (A) A chemical reaction accompanied by absorption of heat is called an exothermic reaction (B) A chemical reaction accompanied by evolution of heat is called an ... does not change on changing the concentration units (D) Chemical equilibrium state is dynamic in nature

Last Answer : (C) The rate constant for a first order reaction does not change on changing the concentration units

The catalyst in a first order chemical reaction changes the (A) Equilibrium constant(B) Activation energy(C) Heat of formation of the product(D) Heat of reaction

Description : The catalyst in a first order chemical reaction changes the (A) Equilibrium constant (B) Activation energy (C) Heat of formation of the product (D) Heat of reaction

Last Answer : (B) Activation energy

The irreversible reaction, X → Y, is the special case of the reversible reaction, X ⇌ Y, in which the (A) Equilibrium constant is infinite (B) Fractional conversion of 'A' at equilibrium is unity (C) Concentration of 'A' at equilibrium is zero (D) All (A), (B) and (C)

Description : The irreversible reaction, X → Y, is the special case of the reversible reaction, X ⇌ Y, in which the (A) Equilibrium constant is infinite (B) Fractional conversion of 'A' at equilibrium is unity (C) Concentration of 'A' at equilibrium is zero (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

For the reversible reaction A ⇌ 2B, if the equilibrium constant K is 0.05 mole/litre; starting from initially 2 moles of A and zero moles of B, how many moles will be formed at equilibrium? (A) 0.253 (B) 0.338 (C) 0.152 (D) 0.637

Description : For the reversible reaction A ⇌ 2B, if the equilibrium constant K is 0.05 mole/litre; starting from initially 2 moles of A and zero moles of B, how many moles will be formed at equilibrium? (A) 0.253 (B) 0.338 (C) 0.152 (D) 0.637

Last Answer : (B) 0.338

The equilibrium constant ‘K’ of a chemical reaction depends on (A) Temperature only (B) Pressure only (C) Temperature and pressure (D) Ratio of reactants

Description : The equilibrium constant ‘K’ of a chemical reaction depends on (A) Temperature only (B) Pressure only (C) Temperature and pressure (D) Ratio of reactants

Last Answer : (A) Temperature only

Limiting reactant in a chemical reaction decides the (A) Rate constant (B) Conversion (C) Reaction speed (D) Equilibrium constant

Description : Limiting reactant in a chemical reaction decides the (A) Rate constant (B) Conversion (C) Reaction speed (D) Equilibrium constant

Last Answer : (B) Conversion

The rate expression for a heterogeneous catalytic reaction is given by, - rA = K.KA PA(1 + KA.PA + KR.PR), where K is surface reaction rate constant and KA and KR are absorption equilibrium constants of A and R respectively. If KR PR >> (1 + KA PA), the apparent activation energy EA is equal to (given E is the activation energy for the reaction and ΔHR and ΔHA are the activation energies of adsorption of R and A) (A) E (B) E + ΔHA (C) E + ΔHA - ΔHR ) (D) ΔHA + ΔHR

Description : The rate expression for a heterogeneous catalytic reaction is given by, - rA = K.KA PA(1 + KA.PA + KR.PR), where K is surface reaction rate constant and KA and KR are absorption equilibrium constants of A and R respectively. If KR PR ... R and A) (A) E (B) E + ΔHA (C) E + ΔHA - ΔHR ) (D) ΔHA + ΔHR

Last Answer : (C) E + ΔHA - ΔHR )

Catalyst is a substance, which __________ chemical reaction. (A) Increases the speed of a (B) Decreases the speed of a (C) Can either increase or decrease the speed of a (D) Alters the value of equilibrium constant in a reversible

Description : Catalyst is a substance, which __________ chemical reaction. (A) Increases the speed of a (B) Decreases the speed of a (C) Can either increase or decrease the speed of a (D) Alters the value of equilibrium constant in a reversible

Last Answer : (C) Can either increase or decrease the speed of a

The equilibrium constant of a catalytic chemical reaction __________ due to the presence of a catalyst. (A) Increases (B) Decreases (C) Remain unaffected (D) Unpredictable from the data

Description : The equilibrium constant of a catalytic chemical reaction __________ due to the presence of a catalyst. (A) Increases (B) Decreases (C) Remain unaffected (D) Unpredictable from the data

Last Answer : (C) Remain unaffected

The equilibrium constant of chemical reaction __________ in the presence of catalyst. (A) Increases (B) Decreases (C) Remain unaffected (D) Can either increase or decrease (depends on the type of catalyst)

Description : The equilibrium constant of chemical reaction __________ in the presence of catalyst. (A) Increases (B) Decreases (C) Remain unaffected (D) Can either increase or decrease (depends on the type of catalyst)

Last Answer : (C) Remain unaffected

The unit of equilibrium constant of a chemical reaction is the same as that of (A) Molar concentration (B) Temperature (C) Internal energy (D) None of these

Description : The unit of equilibrium constant of a chemical reaction is the same as that of (A) Molar concentration (B) Temperature (C) Internal energy (D) None of these

Last Answer : (D) None of these

Two substances are in equilibrium in a reversible chemical reaction. If the concentration of each substance is doubled, then the value of the equilibrium constant will be (A) Same (B) Doubled (C) Halved (D) One fourth of its original value

Description : Two substances are in equilibrium in a reversible chemical reaction. If the concentration of each substance is doubled, then the value of the equilibrium constant will be (A) Same (B) Doubled (C) Halved (D) One fourth of its original value

Last Answer : (A) Same

The free energy change for a chemical reaction is given by (where, K = equilibrium constant) (A) RT ln K (B) -RT ln K (C) -R ln K (D) T ln K

Description : The free energy change for a chemical reaction is given by (where, K = equilibrium constant) (A) RT ln K (B) -RT ln K (C) -R ln K (D) T ln K

Last Answer : (B) -RT ln K

In which of the following reaction equilibrium, the value of equilibrium constant Kp will be more than is Kc? (A) 2HI ⇌ H2 + I2 (B) N2O4 ⇌ 2NO2 (C) 2SO2 + O2 ⇌ 2SO3 (D) None of these

Description : In which of the following reaction equilibrium, the value of equilibrium constant Kp will be more than is Kc? (A) 2HI ⇌ H2 + I2 (B) N2O4 ⇌ 2NO2 (C) 2SO2 + O2 ⇌ 2SO3 (D) None of these

Last Answer : (B) N2O4 ⇌ 2NO2

In a reversible chemical reaction (where, Δx = number of moles of products-number of moles of reactants) (A) Addition of inert gas favours the forward reaction, when Δx is positive (B) Pressure has no effect on equilibrium, when Δn = 0 (C) Addition of inert gas has no effect on the equilibrium constant at constant volume for any value of Δx (+ ve, - ve) or zero) (D) All 'a', 'b' & 'c'

Description : In a reversible chemical reaction (where, Δx = number of moles of products-number of moles of reactants) (A) Addition of inert gas favours the forward reaction, when Δx is positive (B) Pressure has no effect on equilibrium, when Δn = ... any value of Δx (+ ve, - ve) or zero) (D) All 'a', 'b' & 'c'

Last Answer : D) All 'a', 'b' & 'c'

Equilibrium constant decreases as the temperature (A) Increases, for an exothermic reaction (B) Decreases, for an exothermic reaction (C) Increases, for an endothermic reaction (D) None of these

Description : Equilibrium constant decreases as the temperature (A) Increases, for an exothermic reaction (B) Decreases, for an exothermic reaction (C) Increases, for an endothermic reaction (D) None of these

Last Answer : (A) Increases, for an exothermic reaction

The equilibrium constant for a chemical reaction at two different temperatures is given by (A) Kp2/Kp1 = - (∆H/R) (1/T2- 1/T1) (B) Kp2/Kp1 = (∆H/R) (1/T2- 1/T1) (C) Kp2/Kp1 = ∆H (1/T2- 1/T1) (D) Kp2/Kp1 = - (1/R) (1/T2- 1/T1)

Description : The equilibrium constant for a chemical reaction at two different temperatures is given by (A) Kp2/Kp1 = - (∆H/R) (1/T2- 1/T1) (B) Kp2/Kp1 = (∆H/R) (1/T2- 1/T1) (C) Kp2/Kp1 = ∆H (1/T2- 1/T1) (D) Kp2/Kp1 = - (1/R) (1/T2- 1/T1)

Last Answer : (A) Kp2/Kp1 = - (∆H/R) (1/T2- 1/T1)

Equilibrium constant of a reaction varies with the (A) Initial concentration of the reactant (B) Pressure (C) Temperature (D) None of these

Description : Equilibrium constant of a reaction varies with the (A) Initial concentration of the reactant (B) Pressure (C) Temperature (D) None of these

Last Answer : C) Temperature

Pick out the wrong statement. (A) The conversion for a gas phase reaction increases with decrease in pressure, if there is an increase in volume accompanying the reaction (B) With increase in temperature, the equilibrium constant increases for an exothermic reaction (C) The equilibrium constant of a reaction depends upon temperature only (D) The conversion for a gas phase reaction increases with increase in pressure, if there is a decrease in volume accompanying the reaction

Description : Pick out the wrong statement. (A) The conversion for a gas phase reaction increases with decrease in pressure, if there is an increase in volume accompanying the reaction (B) With ... phase reaction increases with increase in pressure, if there is a decrease in volume accompanying the reaction

Last Answer : (B) With increase in temperature, the equilibrium constant increases for an exothermic reaction

_________ explains the equilibrium constant for any chemical reaction. (A) Henry's law (B) Law of mass action (C) Hess's law (D) None of these

Description : _________ explains the equilibrium constant for any chemical reaction. (A) Henry's law (B) Law of mass action (C) Hess's law (D) None of these

Last Answer : (B) Law of mass action

Identify the INCORRECT statement below regarding chemical equilibrium. A All chemical reactions are, in principle, reversible. B Equilibrium is achieved when the forward reaction rate equals the reverse reaction rate. C Equilibrium is achieved when the concentrations of species become constant. D Equilibrium is achieved when the reaction quotient, Q, equals the equilibrium constant. E Equilibrium is achieved when reactant and product concentrations are equal.

Description : Identify the INCORRECT statement below regarding chemical equilibrium. A All chemical reactions are, in principle, reversible. B Equilibrium is achieved when the forward reaction rate equals the ... equilibrium constant. E Equilibrium is achieved when reactant and product concentrations are equal.

Last Answer : E Equilibrium is achieved when reactant and product concentrations are equal.

Which one of the following statements regarding a catalyst is not correct? A An enzyme is a catalyst that only binds certain substrates. B An enzyme is a protein that is a highly efficient catalyst for one or more chemical reactions in a living system. C Catalysts increase the rate of a reaction by altering the mechanism, thereby increasing the activation energy. D Catalysts do not alter the equilibrium constant for a chemical reaction.

Description : Which one of the following statements regarding a catalyst is not correct? A An enzyme is a catalyst that only binds certain substrates. B An enzyme is a protein that is a highly ... increasing the activation energy. D Catalysts do not alter the equilibrium constant for a chemical reaction.

Last Answer : C Catalysts increase the rate of a reaction by altering the mechanism, thereby increasing the activation energy.

The equilibrium constant for the gas phase reactio A + B = C + D is 10-3. The rate of the forward reaction is 10-11 cubic centimeters per molecule per second. What is the rate constant of the reverse reaction? w) 10 cubic centimeters per molecule per second x) 10-8 cubic centimeters per molecule per second y) 10-10 cubic centimeters per molecule per second z) 10-14 cubic centimeters per molecule per second

Description : The equilibrium constant for the gas phase reactio A + B = C + D is 10-3. The rate of the forward reaction is 10-11 cubic centimeters per molecule per second. What is the rate constant of ... second y) 10-10 cubic centimeters per molecule per second z) 10-14 cubic centimeters per molecule per second

Last Answer : ANSWER: Z -- 10-14 CUBIC CENTIMETERS PER MOLECULE PER SECOND 

The equilibrium constant for : `PClrArrPCl_(3)+Cl_(2)` is 0.5 at 500 K. What is the state of vessel shown below ?

Description : The equilibrium constant for : `PClrArrPCl_(3)+Cl_(2)` is 0.5 at 500 K. What is the state of vessel shown below ?

Last Answer : The equilibrium constant for : `PClrArrPCl_(3)+Cl_(2)` is 0.5 at 500 K. What is ... regarding the equilibrium just from the diagram given above.

One mole of A reacts with one mole of B to form 0.1 mole of C and 0.1 mole of D . What will be the value of the equilibrium constant ? `A+BrArrC+D`

Description : One mole of A reacts with one mole of B to form 0.1 mole of C and 0.1 mole of D . What will be the value of the equilibrium constant ? `A+BrArrC+D`

Last Answer : One mole of A reacts with one mole of B to form 0.1 mole of C and 0.1 mole of D . What will be the value of the ... A. 0.1 B. 100 C. `(1)/(81)` D. 81

Write an expression for equilibrium constant with respect to concerntration.

Description : Write an expression for equilibrium constant with respect to concerntration.

Last Answer : Write an expression for equilibrium constant with respect to concerntration.

At equilibrium the concentration of water in vapour phase (C* ) in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m3 containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is (A) 0.0 (B) 0.2 (C) 0.4 (D) 1.0

Description : At equilibrium the concentration of water in vapour phase (C* ) in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room ... which the temperature is maintained constant) is (A) 0.0 (B) 0.2 (C) 0.4 (D) 1.0

Last Answer : (C) 0.4

Write the effect of temperature on Equilibrium constant.

Description : Write the effect of temperature on Equilibrium constant.

Last Answer : Ans. The value of Equilibrium constant changes with the temperature. The increase in rate depends upon activation energy .As the activation energy are different for forward & backward direction .So temperature will ... & backward direction. As K= Kf/ Kb ,so the state of equilibrium will be altered.

Why the Equilibrium constant is taken as dimensionless?

Description : Why the Equilibrium constant is taken as dimensionless?

Last Answer : Ans. Activities are used in place of molar Conc. These represent the concentration or pressure with respect to standard state.