What are reversible reaction?

What are reversible reaction?
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1 Answer

Answer :

Those reactions in which the reactants products are converted into each other under same set of conditions.
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Related questions

How the change in pressure at equilibrium position effect the following reaction? PCl5 PCl3 + Cl2

Description : How the change in pressure at equilibrium position effect the following reaction? PCl5 PCl3 + Cl2

Last Answer : According to Le–chatlier’s principle, by increasing pressure the reaction will move toward less number of moles. In the above reaction, by increasing pressure the reaction will move in backward direction.

How value of Kc can help to predict the extent to which a chemical reaction can take place?

Description : How value of Kc can help to predict the extent to which a chemical reaction can take place?

Last Answer : The extent of reaction depends upon the magnitude of Kc. i.e. (i) Very small value of Kc: when Kc is very small the forward reaction will not occur to an appreciable extent ... neither very large nor very small, the equilibrium mixture contains appreciable amounts of both reactant and products.

How Kc can be applied to calculate direction of chemical reaction?

Description : How Kc can be applied to calculate direction of chemical reaction?

Last Answer : (i) If < Kc Then the reaction will proceed in the forward direction until the equilibrium is established. (ii) If > Kc Then the reaction will proceed in the backward direction until the equilibrium is established. If = kc Then the reaction is already in equilibrium.

What is solubility product?

Description : What is solubility product?

Last Answer : The product of molar solubilities of the ions of weak electrolyte at equilibrium stage is called solubility product. It is represented by Ksp

What is common ion effect?

Description : What is common ion effect?

Last Answer : The decrease in ionization of a weak electrolyte by adding another strong electrolyte having common ion.e.g ionization of NaCl is decreased by passing HCl through NaCl solution.

How can you co–relate Ka with Kc?

Description : How can you co–relate Ka with Kc?

Last Answer : Ka is dissociation constant of an acid while Kc is the equilibrium constant suppose an acid HA Ionize as HA + H2O  H3O+ + A– Kc = concentration of [H2O] almost remains constant so we can write. Kc = Kc [H2O] = ka Ka =

A buffer consists of a weak acid and is salt.

Description : A buffer consists of a weak acid and is salt.

Last Answer : (i) CH3COOH + CH3COONa (ii) C6H5COOH + C6H5COONa (iii) H2CO3 + NaHCO3 (iv) H3PO3 + NaH2PO4

How can you purify NaCl by common ion effect?

Description : How can you purify NaCl by common ion effect?

Last Answer : The impurities present in the common salt are CaCl2 MgCl2 and Na2SO4 in it. These impurities can be removed by common Ion effect. For this purpose a saturated solution of NaCl is prepared. Then ... electrolyte than NaCl Ionization of NaCl is suppressed by passing HCl gas and it is precipitated out.

Prove that Kw is ionic product of water and its value is 1 x 10–14 at 25o.

Description : Prove that Kw is ionic product of water and its value is 1 x 10–14 at 25o.

Last Answer : Water undergoes self ionization as 2H2O  H3O+ + OH– or H2O  H+ + OH– Kc [H2O] = [H+] [OH–] Kw = [H+] [OH–] At 25oC the value of Kw ionic product have been measured. Its value is 1 x 10–14.

What is the relationship b/w kc, kp kc & kn?

Description : What is the relationship b/w kc, kp kc & kn?

Last Answer : These four parameters are related as. Kp = Kc (RT)n = Kx (P)n = Kn When mole of products are reactant are equal i.e. n = 0 their Kp = kc = dx = kn

A catalyst does not change the position of equilibrium but this equilibrium position approach earlier. Why?

Description : A catalyst does not change the position of equilibrium but this equilibrium position approach earlier. Why?

Last Answer : A catalyst decrease the energy of activation required by reacting substance so the position of equilibrium reaches earlier.

What are optimum conditions for the formation of NH3 by Haber’s process?

Description : What are optimum conditions for the formation of NH3 by Haber’s process? N2(g) + 3H2(g) 2NH3(g) H = -92.46 kJ/m

Last Answer : (i) As the reaction is exothermic max yield is obtained at low temp. (ii) By applying pressure, more product is obtained. According four moles of reactants produce two moles of product so by applying ... (vi) Rate of reaction can also be increase with the help of catalyst like iron or iron oxide.

What is buffer capacity?

Description : What is buffer capacity?

Last Answer : The amount of acid or base which a buffer can absorb without significant charge in PH is called buffer capacity. Buffer capacity is the ability of buffer to resist the change in its PH value.

Discuss the factors on which buffer PH depends.

Description : Discuss the factors on which buffer PH depends.

Last Answer : PH of buffer depends upon two factors. (i) Pka or ka value of an acid (ii) Concentration of salt and acid taken for the buffer.

Why we need buffer solution in daily life?

Description : Why we need buffer solution in daily life?

Last Answer : Buffers can resist the charge of its PH value therefore they are required in chemical analysis, pharmaceuticals, electroplating, photography, beverage industry, microbiology molecular biology, soil science and in quantitative ... PH 7.35. If it decreases upto 7 or goes upto 8 death may occur.

What are conjugate acid and bases?

Description : What are conjugate acid and bases?

Last Answer : When an acid is dissolved in water it will form H3O+ ions and an anion the anion of an acid is called conjugate base and H3O+ is called conjugate acid e.g. CH3OOH + H2O H3O+ + CH3COO– Acid Base Conjugate acid Conjugate base

Define Le–Chatlier’s principle.

Description : Define Le–Chatlier’s principle.

Last Answer : If a system in equilibrium is disturbed at equilibrium it will move in that direction where change is minimized.

What is meant by state of chemical equilibrium?

Description : What is meant by state of chemical equilibrium?

Last Answer : The state of reversible reaction, in which forward and reverse rates are equal.(Rf=Rr)

What is weak electrolyte?

Description : What is weak electrolyte?

Last Answer : A compound which is only partially ionized in aqueous solution is called as weak electrolyte.e.g CH3COOH(Acetic aci)

In a reversible reaction `K_(c)gtK_(p)andDeltaH=+40k`Cal. The product will be obtained in less amount at :-

Description : In a reversible reaction `K_(c)gtK_(p)andDeltaH=+40k`Cal. The product will be obtained in less amount at :-

Last Answer : In a reversible reaction `K_(c)gtK_(p)andDeltaH=+40k`Cal. The product will be obtained in ... , low temperature D. Low pressure , high temperature

If the forward rate constant of reversible reaction is 0.16 and backward rate constant is `4xx10^(4)` , then the equilibrum constant will be .

Description : If the forward rate constant of reversible reaction is 0.16 and backward rate constant is `4xx10^(4)` , then the equilibrum constant will be .

Last Answer : If the forward rate constant of reversible reaction is 0.16 and backward rate constant is `4xx10^(4)` , then the ... C. `4xx10^(-6)` D. `4xx10^(-5)`

A reversible reaction is which :-

Description : A reversible reaction is which :-

Last Answer : A reversible reaction is which :- A. Proceeds in one direction B. Proceeds in both directions C. Proceeds spontaneously D. All statements are wrong

Formation of ammonium carbamate by reaction of NH3 with CO2 is a/an __________ reaction. (A) Catalytic (B) Exothermic (C) Endothermic (D) Reversible

Description : Formation of ammonium carbamate by reaction of NH3 with CO2 is a/an __________ reaction. (A) Catalytic (B) Exothermic (C) Endothermic (D) Reversible

Last Answer : (B) Exothermic

Dehydration of ammonium carbamate (to produce urea) is a/an __________ reaction. (A) Reversible (B) Catalytic(C) Exothermic(D) Endothermic

Description : Dehydration of ammonium carbamate (to produce urea) is a/an __________ reaction. (A) Reversible (B) Catalytic (C) Exothermic (D) Endothermic

Last Answer : (D) Endothermic

Use of catalyst is a must in the ammonia manufacture, because the reaction is reversible as well as the heat of dissociation of N2 & H2 is high. The presence of promoter along with the catalyst helps in __________ of the catalyst. (A) Stabilisation (B) Increasing the effectiveness (C) Improving the strength & heat resistance (D) All a, b & c

Description : Use of catalyst is a must in the ammonia manufacture, because the reaction is reversible as well as the heat of dissociation of N2 & H2 is high. The presence of promoter along with the catalyst helps in ... B) Increasing the effectiveness (C) Improving the strength & heat resistance (D) All a, b & c

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

Conversion increases with increase in temperature in case of a/an__________ reaction.(A) Autocatalytic(B) Irreversible(C) Reversible endothermic(D) Reversible exothermic

Description : Conversion increases with increase in temperature in case of a/an__________ reaction. (A) Autocatalytic (B) Irreversible (C) Reversible endothermic (D) Reversible exothermic

Last Answer : (C) Reversible endothermic

The catalyst in a second order reversible reaction increases the rate of the forward reaction (A) And decreases that of backward reaction (B) And backward reaction equally (C) Only (D) To a greater extent than that of the backward reaction

Description : The catalyst in a second order reversible reaction increases the rate of the forward reaction (A) And decreases that of backward reaction (B) And backward reaction equally (C) Only (D) To a greater extent than that of the backward reaction

Last Answer : (B) And backward reaction equally

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

An isothermal aqueous phase reversible reaction, P ⇌ R, is to be carried out in a mixed flow reactor. The reaction rate in k.mole/m3 .h is given by, r = 0.5CP - 0.125CR. A stream containing only P enters the reactor. The residence time required (in hours) for 40% conversion of P is (A) 0.80 (B) 1.33 (C) 1.60 (D) 2.67

Description : An isothermal aqueous phase reversible reaction, P ⇌ R, is to be carried out in a mixed flow reactor. The reaction rate in k.mole/m3 .h is given by, r = 0.5CP - 0.125CR. A stream containing only P enters the reactor. The ... (in hours) for 40% conversion of P is (A) 0.80 (B) 1.33 (C) 1.60 (D) 2.67

Last Answer : (C) 1.60

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

An autothermal reactor is (A) Most suitable for a second order reaction (B) Most suitable for a reversible reaction (C) Completely self-supporting in its thermal energy requirements (D) Isothermal in nature

Description : An autothermal reactor is (A) Most suitable for a second order reaction (B) Most suitable for a reversible reaction (C) Completely self-supporting in its thermal energy requirements (D) Isothermal in nature

Last Answer : (C) Completely self-supporting in its thermal energy requirements

With decrease in temperature, the equilibrium conversion of a reversible endothermic reaction (A) Decreases (B) Increases (C) Remain unaffected (D) Increases linearly with temperature

Description : With decrease in temperature, the equilibrium conversion of a reversible endothermic reaction (A) Decreases (B) Increases (C) Remain unaffected (D) Increases linearly with temperature

Last Answer : (A) Decreases

In the reversible reaction of the type, A + B ⇌ AB, in general (A) Both forward and backward reactions will be exothermic (B) Neither of the reactions will be endothermic (C) The combination reaction will be exothermic, while the dissociation reaction will be endothermic (D) The combination reaction will be endothermic, while the dissociation reaction will be exothermic

Description : In the reversible reaction of the type, A + B ⇌ AB, in general (A) Both forward and backward reactions will be exothermic (B) Neither of the reactions will be endothermic (C) ... will be endothermic (D) The combination reaction will be endothermic, while the dissociation reaction will be exothermic

Last Answer : (C) The combination reaction will be exothermic, while the dissociation reaction will be endothermic

Photochemical reaction rate does not depend significantly on temperature, because (A) It is a reversible reaction (B) It is an exothermic reaction (C) The energy of reacting molecules exceeds the activation energy by absorption of light (D) None of these

Description : Photochemical reaction rate does not depend significantly on temperature, because (A) It is a reversible reaction (B) It is an exothermic reaction (C) The energy of reacting molecules exceeds the activation energy by absorption of light (D) None of these

Last Answer : (C) The energy of reacting molecules exceeds the activation energy by absorption of light

In a reversible reaction, a catalyst increases the rate of forward reaction (A) Only(B) To a greater extent than that of the backward reaction(C) And decreases that of the backward reaction(D) And the backward reaction equally

Description : In a reversible reaction, a catalyst increases the rate of forward reaction (A) Only (B) To a greater extent than that of the backward reaction (C) And decreases that of the backward reaction (D) And the backward reaction equally

Last Answer : (D) And the backward reaction equally

A reversible liquid phase endothermic reaction is to be carried out in a plug flow reactor. For minimum reactor volume, it should be operated such that the temperature along the length (A) Decreases (B) Increases (C) Is at the highest allowable temperature throughout (D) First increases and then decreases

Description : A reversible liquid phase endothermic reaction is to be carried out in a plug flow reactor. For minimum reactor volume, it should be operated such that the temperature along the length (A) ... Increases (C) Is at the highest allowable temperature throughout (D) First increases and then decreases

Last Answer : (C) Is at the highest allowable temperature throughout

When an exothermic reversible reaction is conducted adiabatically, the rate of reaction (A) Continuously increases (B) Continuously decreases (C) Passes through a maximum (D) Passes through a minimum

Description : When an exothermic reversible reaction is conducted adiabatically, the rate of reaction (A) Continuously increases (B) Continuously decreases (C) Passes through a maximum (D) Passes through a minimum

Last Answer : (C) Passes through a maximum

In case of a/an __________ chemical reaction, conversion increases with the rise in temperature. (A) Reversible exothermic (B) Irreversible exothermic (C) Irreversible endothermic (D) Reversible endothermic

Description : In case of a/an __________ chemical reaction, conversion increases with the rise in temperature. (A) Reversible exothermic (B) Irreversible exothermic (C) Irreversible endothermic (D) Reversible endothermic

Last Answer : (D) Reversible endothermic

Pick out the wrong statement. (A) Use of different catalysts in a reversible catalytic chemical reaction does not change the equilibrium composition (B) Alumina is added as a promoter to iron catalyst in ammonia synthesis reaction (C) Activation energy for a reaction is obtained from the intercept of the Arrhenius plot (D) Presence of inerts affects the equilibrium conversion of reactants in a chemical reaction

Description : Pick out the wrong statement. (A) Use of different catalysts in a reversible catalytic chemical reaction does not change the equilibrium composition (B) Alumina is added as a promoter to ... Arrhenius plot (D) Presence of inerts affects the equilibrium conversion of reactants in a chemical reaction

Last Answer : (C) Activation energy for a reaction is obtained from the intercept of the Arrhenius plot

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

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

Promoter (A) Initiates a chemical reaction and is a catalyst by itself (B) Alters the position of equilibrium in a reversible reaction (C) Increases the number of active centres by increasing the unevenness of catalyst surface and by creating discontinuities in the crystals(D) All (A), (B) and (C)

Description : Promoter (A) Initiates a chemical reaction and is a catalyst by itself (B) Alters the position of equilibrium in a reversible reaction (C) Increases the number of active centres by increasing the unevenness of catalyst surface and by creating discontinuities in the crystals (D) All (A), (B) and (C)

Last Answer : (C) Increases the number of active centres by increasing the unevenness of catalyst surface and by creating discontinuities in the crystals

A typical example of an exothermic reversible reaction conducted at high pressure in industry is (A) Dehydration of ethanol (B) Methanol synthesis (C) Reformation of methane (D) Polymerisation of ethylene

Description : A typical example of an exothermic reversible reaction conducted at high pressure in industry is (A) Dehydration of ethanol (B) Methanol synthesis (C) Reformation of methane (D) Polymerisation of ethylene

Last Answer : (A) Dehydration of ethanol

Fractional conversion __________ for an exothermic reversible chemical reaction, when the temperature is maximum. (A) Increases (B) Remains unchanged (C) Decreases (D) Unpredictable from the data

Description : Fractional conversion __________ for an exothermic reversible chemical reaction, when the temperature is maximum. (A) Increases (B) Remains unchanged (C) Decreases (D) Unpredictable from the data

Last Answer : (C) Decreases

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)

Pick out the wrong statement. (A) A catalyst does not alter the final position of equilibrium in a reversible reaction (B) A catalyst initiates a reaction (C) A catalyst is specific in reaction (D) A catalyst remains unchanged in chemical composition at the end the reaction

Description : Pick out the wrong statement. (A) A catalyst does not alter the final position of equilibrium in a reversible reaction (B) A catalyst initiates a reaction (C) A catalyst is specific in reaction (D) A catalyst remains unchanged in chemical composition at the end the reaction

Last Answer : (B) A catalyst initiates a reaction

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

Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor? (A) Temperature should be high in the beginning and decreased towards the end of the reaction (B) Very low temperature should be used throughout the reaction (C) Very high temperature should be used throughout the reaction (D) None of these

Description : Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor? (A) Temperature should be high in the beginning and decreased towards ... reaction (C) Very high temperature should be used throughout the reaction (D) None of these

Last Answer : (A) Temperature should be high in the beginning and decreased towards the end of the reaction

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

Esterification reaction (A) Produces soap (B) Is reversible (C) Is a reaction between an alcohol and an organic acid (D) All (A), (B) and (C)

Description : Esterification reaction (A) Produces soap (B) Is reversible (C) Is a reaction between an alcohol and an organic acid (D) All (A), (B) and (C)

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