Equilibrium Questions and Answers

1 6 2 4 3 8 4 7 6x10 mole K Cr 0 reacts completely with 9 10 mole of X to give XO and Cr Value of n will be 1 1 2 3 3 2 Which of the following is an intensive property of the system 4 4

Calculate the pH of a solution prepared by dissolving 0 350 mol of benzoic acid C H5O H and 0 300 mol of sodium benzoate NaC7H5O in water sufficient to yield 1 00 L of solution The K of benzoic acid is 6 50 10 5 O 9 746 9 880 O 4 254 O 5 190

For the reaction SO g 0 g SO g if K K RT where the symbols have usual meaning then the value of x is Assuming ideality 1 1 2 12 2

Q20 20 ml of 0 8 M HA solution is neutralised by 0 2 M NaOH solution at 25 C pH of resulting solution at equivalent point is pKb of A 8 log2 0 3 ID Q 529166 Options are A 2 6 B 9 6 C 4 4 D 10 4

a 10 4 b 2x 10 3 c 0 02 d 0 1 149 What mass of AgI will dissolve in 1 0 L of 1 0 M NH 3 Neglect change in conc of NH3 Given Ksp AgI 1 5 x 10 6 K Ag NH3 2 1 6 107 At mass Ag 108 1 121 b 0 0056 g d 0 011 g c 0 035 g 150 Consider the following statement and select correct option a 4 9 10 5 X g 0 38 O TZ m1

27 For the reversible gaseous reaction T 2HI g the value of K for the reaction H2 8 12 8 7 8 g H 203 2 g 1 and 1638 4 g of HI were found at equilibrium Calculate Ans 0 019

What is the relation between the equilibrium constants K and K of following reversible reaction H g 12 g 2HI g and 2HI g H g 1 g Ans K What is the relation between equilibrium constants K and K for the following reactions 1

Calculate the percent ionization of nitrous acid in a solution that is 0 266 M in nitrous acid HNO2 and 0 112 M in potassium nitrite KNO The acid dissociation constant of nitrous acid is 4 50 x 10 4 O 11 2 O 0 399 O2 974 296

MAS 4 gram of NaOH are present in 500 mL of aqueous solution What is the active mass of NaOH 17 gram of ammonia gas is present in 2 litre flask Calculate the active mass of the gas Ans 0 2 Ans 0 5

Some quantity of water is contained in a container as shown in figure As neon is added to this system at constant pressure the amount of liquid water in the vessel A increases C remains same B decreases D changes unpredictably vapour water

18 a 8 0 10 b 8 0 10 15 c 8 0 10 17 d 8 0 10 14 139 What is the minimum pH necessary to cause a precipitate of Pb OH Ksp 1 2 x 10 5 to 2 form in a 0 12 M PbCl solution b 10 8 a 12 4 c 12 0 140 Which of the following would increase the solubility of Pb OH d 11 1

150 Consider the following statement and select correct option 1 Ksp of Fe OH 3 in aqueous solution is 3 8 x 10 38 at 298 K The concentration of Fe will increase when H ion concentration decreases II In a mixture of NH4Cl and NH4OH in water a further amount of NH4Cl is added The pH of the mixture will decreases III An aqueous solution of each of the following salts NH 1 HCOOK will be basic acidic respectively a only I is correct c only III is correct b only II is correct d II and III are correct

M HCI 50 cm 0 2 M NaOH 2 57 At 25 C the solubility product of Hg Cl in water is 3 2x 10 17 mol dm 9 What is the solubility of Hg2Cl2 in water at 25 C a 1 2x 10 12 M c 2 10 6 M e 5 2x 10 6 M Kerala CEE 2011 b 3 0x 10 6 M d 1 2x 10 16 M

Which of the following statement s is are correct about the ionic product of water 4 K ionization constant of water Kw ionic product of water 3 pK pKw C at 25 K 1 8 10 4 D ionic product of water at 10 C is 10 14

The reaction A B C D is studied in a one litre Vessel at 250 C The initial concentration of A was 3n and of B was n After equilibrium was attained then equilibrium concentration of C was found to be equal to equilibrium concentration of B What is the concentration of D at equilibrium 1 12 2 n 3 n 2 3n 4 n 2

6 pH of a solution produced when an aqueous solution of pH 6 is mixed with an equal volume of an aqueous KCET 2012 solution of pH 3 is about a 3 3 b 4 3 c 4 0 pH of a saturated solution of Ba OH d 4 5 is 12 TI

For a weak acid the incorrect statement is Manipal 2 a its dissociation constant is low b its pKa is very low c it is partially dissociated d solution of its sodium salt is alkaline in water

Q 20 2 NOBr g 2 NO g Br g If nitrosyl bromide NOBr is 33 33 dissociated at 25 C a total pressure of 0 28 atm Calculate K for the dissociation at this temperature

In which of the following aqueous solution the degree of dissociation of water is maximum 1 NH4Cl solution 1 204 2 CH3COONa solution 3 CH3COONH solution 4 NaCl solution 1 201 5 The solubility of BaSO4 in water is 0 00233 g per litre at 30 C The solubility of BaSO4 in 0 1 M NH4 2SO4 colution at the same temperature is Ba 137

What is the correct dissociation constant expression for the following reaction HCHO aq H O 1 H3O aq CHO aq O Kb O Ka HO CHO RCH K Oks HCHO H CHO HOCHO HCHO HCHO B9 H

Find the pH of the equivalence point and the volume mL of 0 0639 M KOH needed to reach the equivalence point in the titration of 23 4 mL of 0 0390 M HNO2 Volume mL KOH pH

b 10 Which pair will show common ion effect a BaCl Ba NO3 2 c NH OH NH4Cl c 10 MPPMT b NaCl HCI d AgCN KCN If s and Kp are respectively solubility and solubility product

2 Equivalent resonating structures result in higher resonance energy 3 Resonating structures represent hypothetical molecules having no real existence 4 Resonating structures are less stable than the resonance hybrid In some solutions the concentration of H O remains constant even when small amounts of strong acid or strong base are added to them These solutions are known as 1 Ideal solutions 2 Colloidal solutions 3 True solutions 4 Buffer solutions

a Identify the correct statement regarding entropy 1 At absolute zero of temperature the entropy of all crystalline substances is taken to be zero 2 At absolute zero of temperature the entropy of a perfectly crystalline substance is ve 3 At absolute zero of temperature entropy of a perfectly crystalline substance is taken to be zero 4 At 0 C the entropy of a perfectly crystalline substance is taken to be zero

An equilibrium mixture at 300 K contains N O and NO at 0 28 and 1 1 atmosphere respectively If the volume of container is doubled calculate the new equilibrium pressure of two gases Roorkee 1991 P 0 045 P 0 095 atm Pro 064 atm

Which of the following are correct Ksp of Fe OH 3 in aqueous solution is 3 8 x 10 38 at 298K The concentration of Fe will increase when H ion concentration decreases In a mixture of NH4Cl and NH4OH in water a further amount of NH4Cl is added The pH of the mixture will decreases An aqueous solution of each of the following salts NH4l Cr NO3 3 9H2O KCN will be basic basic acidic respectively From separate solutions of four sodium salts NaW Nax NaY and NaZ had pH 7 0 9 0 10 0 and 11 0 respectively when each solution was 0 1M the strongest acid is HW

The equilibrium constant for a reaction A B C D is 1x10 at 298K and is 2 at 273 K The chemical process resulting in the formation of C and D is 2 Endothermic 3 Unpredictable 1 Exothermic 4 There is no relationship between AH and K The most suitable method of separation of 1 1 mixture of ortho and para nitrophenol is 2 Crystallication 1 Sublimation 2 Chromatography 4 Steam distillation

Consider the following reaction where K 2 90 10 at 1150 K 280 g 250 g O g A reaction mixture was found to contain 3 61 10 moles of SO g 1 83 102 moles of SO g and 4 06x102 moles of O g in a 1 00 liter contain Is the reaction at equilibrium If not what direction must it run in order to reach equilibrium The reaction quotient Qe equals The reaction A must run in the forward direction to reach equilibrium B must run in the reverse direction to reach equilibrium Gis st aqulibein

primary secondary or tertiary Which alcohol reacts fastest and by what mechanism 1 Secondary alcohol by S 2 2 Tertiary alcohol by S 2 3 Secondary alcohol by S 1 4 Tertiary alcohol by S 1 30 mL of 0 2N BaCl is mixed with 40 mL of 0 3 N AL SO How many g of BaSO are forme 1 0 10 g 2 0 60 g 3 0 90 g 4 0 70 g 1 mole each of AgNO CuSO and AICI is electrolysed Then ratio of number of Farad

1 In the reaction S 3 2 O SO 2x kcal and SO y kcal the heat of SO 1 2 0 formation of SO is 1 2x y 2 x y 3 x y 4 y 2x 2 At 27 C latent heat of fusion of a compound is

a 8 0 x 10 18 139 What is the minimum pH necessary to cause a precipitate of Pb OH 2 Ksp 1 2 x 10 to c 8 0 x 10 17 d 8 0 x 10 14 b 8 0 x 10 form in a 0 12 M PbCl solution a 12 4 b 10 8 40 Which of the following would incre a Add 1 15 sp c 12 0 d 11 1

a 1 0 b 1 29 c 1 512 d 4 65 134 What is the molarity of F ions in a saturated solution of BaF2 Ksp 1 0 10 6 a 1 0 x 10 2 d 6 3 10 b 1 0 x 10 c 1 26 x 10 2 135 What is the molarity of F in a saturated solution of InF3 Ksp 7 9 x 10 10

14 Following reaction occurring in an automobile 16CO g 18H O g The 2CH 9 250 g sign of AH AS and AG would be 1 2 3 4 15 When 5 litres of a gas mixture of methane and

1 1 15 kJ 2 15 1 kJ 3 49 1 kJ 4 1511 KJ For a reaction equilibrium NO 8 2NO 8 the concentration of NO and NO a equilibrium are 4 8 10 and 1 2x10 mol L respectively The value of K for the reaction is 2 3 3x10 mol L 3 3x10 mol L 4 3 3x10 mol L 1 3x10 mol L An azeotropic solution of two liquids has boiling point lower than either of them when it 1 shows negative deviation from Raoult s law

c K 2 C CH3COOH is 2 0 ionised K 1 8x 10 hence its molar concentration is a 0 045 M c 3 6 x 10 5 M b 0 02 M d 0 090 M unak acid is 1 at 1 M hence ionisation

Jeq The equilibrium constant for the reaction Kc 9 4 2X s Y g 2Z g What would be the concentration of Y at equilibrium if 3 0 mole of and 3 0 mole of Z are present in 2 litre vessel at equilibrium

3 a iv b i c d ii 4 a i b i c iv d ii 5 Three moles of an ideal gas expander spontaneously into vacuum The work done will be AIPMT Mains 2010 2 3 Joules 4 Zero 1 Infinite 3 9 Joules

If Ksp of Ag CO3 is 8 x 10 12 the molar solubility of Ag CO3 in 0 1 M AgNO3 is h A 00 C 8x 10 12 p M 8x 10 10 M 8 10 M D 8 10 13 M

16 For the gaseous equilibrium reaction A B 2C D the value of equilibrium constant at 300 K is 50 mol lit Calculate K for the reaction at this temperature Ans 1230 atmosphere 7 For the equilibrium gaseous reaction

At a particular temperature the following reaction is carried out with 1 mol of A g and 1 mol of B g in a closed vessel A g 4B g AB g of AB g be higher Will the equilibrium concentration than that of A g

Equilibrium constants for the reversible reactions 2H O g 2H g O g and 2CO g 2CO g O g are 2 1 x 10 13 1 4 x 10 12 mol lit at a given temperature Cal equilibrium constant for the reaction H g CO g H O g CO g at the same tempe Ans T

At 400 C H g and I g are allowed to react in a closed vessel of 5 L capacity to produce HI g At equilibrium the mixture in the flask is found to consist of 0 6 mol H g 0 6 mol I g and 3 5 mol HI g Determine the value of K of the reaction C

D The information is insufficient to decide the In a basic aqueous solution chloromethane undergoes a substitution reaction in which CI is replaced by OH as CH Cl aq OH CH OH aq Cl aq The equilibrium constant of above reaction K 1 x 10 6 If a solution is prepared by mixing equal volumes of 0 1 M CH Cl and 0 2 M NaOH 100 dissociated then OH concentration at equilibrium in mixture will be A 0 1 M B 0 5 M C 0 2 M D 0 05 M

C 50 g of 20 M NaOH dsoln 1 g ml D 50 g of 5m NaOH An organic compound is burnt with excess of O to produce CO g and H O which results in 25 volume contraction Which of the following option s satisfy the given conditions A 10 ml C3H8 110 ml 0 C 10 ml C3H8O 50 ml 0 B 20 ml C HO 80 ml O D 40 ml C H O4 60 ml 0 A sample of H O solution labelled as 56 77 volume has density of 530 g L Mark the correct option s representing concentration of same solution in other units Solution contains only H O and H O

2 24 A solution of weak acid HA was titrated with base NaOH The equivalence point was reached when 36 12 ml of 0 1 M NaOH has been added Now 18 06 ml of 0 1 M HCl were added to titrated solution the pH was found to be 4 92 What will be the pH of the solution obtained by mixing 10 ml of 0 2 M NaOH and 10 ml of 0 2 M HA N u H NAA Hce 18 06X0 10 va 20 MA

At 30 C K for the dissociation reaction SO CL g SO g Cl g is 2 9 x 10 2 atm If the toal pressure is 1 atm the degree of dissociation of SO Cl is

aq NaCl d aq CuCl 21 When an aqueous solution of H SO4 is electrolysed the product at anode is lag a H d 0 b OH gian oo c So 2 An 201 eous soluti

A 2B 2C Initially 2 mole of A and B are taken in 10 lit flas at equilibrium 1 mole of C is formed then calculat K for given reaction 1 6 66 2 3 33 3 2 22 4 1 11

A compound of X and Y has equal mass of them If their atomic weights are 30 and 20 respectively Molecular formula of that compound 1 X Y 3 X Y 3 2 X Y3 4 X Y 3

The solubility of BaSO4 in water 2 42 x 10 gl 1 at 298 K The value of solubility product Ksp will be Given molar mass of BaSO4 233 g mol 1 1 08 x 10 10 mol L 2 2 1 08 x 10 12 mol L 2 3 1 08 x 10 14 mol L 2 4 1 08 x 10 8 mol L 2