Equilibrium Questions and Answers

If for the reaction A s B g C g total pressure is at equilibrium is P atm then value of Kp is p 2 P 4

1 The following reaction has a Kp 4 5 x 10 at 825K Determine the value of Kc for the reaction at that same temperature CH4 g CO2 g 2CO g 2H2 g a 4 5 x 10 2 b 6 6 C 0 098 d

Consider the following reaction 1 g Cl g 21Cl g Kp 81 9 at 25 C A reaction mixture at 25 C initially contains 0 266 atm 12 0 266 atm Cl and 0 316 atm ICI What is th concentration of ICI at equilibrium in atm Report your answer to 3 decimal places without units

a 3 x 10 M b 9 10 M 3 x 10 M 110 An acid base indicator which is a weak acid has a pKa value 5 45 At what concentration ratio of sodium acetate to acetic acid would the indicator show a colour half way between those of its acid and conjugate base forms pKa of acetic acid 4 75 b 6 1 d 3 1 a 4 1 c 5 1

a 10 4 b 10 1 c 6 1 d 10 7 103 The pH of the resultant solution of 20 mL of 0 1 MH3PO4 and 20 mL of 0 1 M Na3PO4 is pKq pK a c pK a2 d 2 during the titration of NaOH a pk log 2 a b pKa a

Problem 7 1 The value of AG for the phosphorylation of glucose in glycolysis is 13 8 kJ mol Find the value of K at 298 K Solution AG 13 8 kJ mol 13 8 x 10 J mol Also AG RT InK Hence In K 13 8 x 10 J mol 8 314 J mol K x 298 K In K 5 569 K e 5 569

For pure water which of the following condition is valid at al temperature pH 7 pH pOH 14 pH pkw 2 pH pOH 7

tion Compound Metallurgy Chemical Kinetics Periodic Table Spartan Batch 2NH3 g 22 kcal E for the 9 N g 3H g 2NH g 22 kcal fish fell E4 70 kcal 13 34folg is A For N g 3H g reaction is 70 kcal Hence the activation energy for 2NH3 9 1 92 kcal 2 70 kcal 3 48 kcal 4 22 kcal N g 3H g is reaction A 2NH g N g 3H g 1 92 kcal 2 70 kcal 3 48 kcal 4 22 kcal 10 fufchen w fazin afsu n JC

Which of the following is correct AC and A represent conductance at C concentration and at infinite dilution respectively AHCI A AC CI H ANNO AHNO Naci Ac 3 C ANaNO ANO A ac Ad HNO3 C

1 Na K 2 K Rb 3 K Rb 4 Rb Na 4 A quantity of PC15 was heated in a 2 litre vessel at 525 K It dissociates as PCIs g PCI3 g Cl g At equilibrium 0 2 mol each of PCIs PCI and Cl is found in the reaction mixture The equilibr constant Kc for the reaction is 1 0 2 2 0 5 3 0 1 4 0 05

e e 2A s B g C g 2D s E s the degree of dissociation of B was found to be 20 at 300 K and 24 at 500K The rate of backward reaction 1 increases with increase in pressure and temperature 2 increases with increase in pressure and decrease in temperature 3 depends on temperature only and decrease with increase in temperature 4 increases with increase in concentration of B and

58 The equilibrium constant for the following reactions are K and K respectively 2P g 3Cl g 2PCl g PC12 g Cl g PC15 g Then the equilibrium constant for the reaction 2P g 5Cl g a K K c K K 2PC1 g is 2 b K K d K 2K

Change in volume of the system does not alter the number of moles in which of the following equilibrium Question Type Single Correct Type 1 N g O g 2NO g 2 PCI5 g PCl3 g Cl g 3 N g 3H g 2NH3 g 4 SO Cl g SO g Cl g

For the reaction 2NO3 g 2NO g O2 g Kc 1 8 x 10 at 184 C R 0 00831 kJ molk When K and Kc are compared at 184 C it is found that 1 Whether K is greater than less than or equal Ke depends upon the total gas pressure 2 K K 3 K is less than K 4 K is greater than Ke 30 A compound A of formula C H Cl on reaction with alkali can give B of formula C H O or C nompound of the formulo C HOC with dilute of formule C H P on oxidation ou

M 2 Solid Ba NO3 2 is gradually dissolved to 1 x 10 Na2CO3 solution At what concentration of Ba precipitation of BaCO3 will start Ksp for BaCO3 5 1 10 Question Type Single Correct Type 1 4 1 x 10 5 M 2 5 1 x 10 5 M 3 8 1 x 10 5 M

109 MY and NY3 two nearly insoluble salts have the same 114 Ksp values of 6 2 x 10 13 at room temperature Which statement would be true in regard to MY and NY3 1 The molar solubility of MY in water is less than that of NY 3 2 The salts MY and NY3 are more soluble in 0 5 M KY than in pure water 3 The addition of the salt of KY to solution of MY and NY will have no effect on their solubilities 4 The molar solubilities of MY and NY3 in water are identical a H O b H O Role of hy respectively 1 oxidizing 2 reducing 3 reducing 4 oxidizing 115

For the following endothermic reaction A g B g C g This reaction is Select one spontaneous at all temperatures non spontaneous at all temperatures spontaneous only at low temperatures spontaneous only at high temperatures

If the acid base reaction HA aq B aq HB aq A aq has a K 104 which of the following statements are true i HB is stronger acid than HA ii HA and HB have the same acidity v A is stronger base than B ii HA is stronger acid than HB iv B is stronger base than A vi B and HB are conjugate acid base pair D iv v vi vii the acid and base strengths connot be compared A i iii v B i v vi C ii iv vi

An acid base indicator which is a weak acid has a pka value 5 45 At what cocentration ratio of sodiumacetate to acetic acid would the indicator show a colour half way between those of its acid and conjugate base forms pka of acetic acid 4 75 log 2 0 3 1 4 1 2 7 1 3 5 1 4 2 1

Statement l 100 ml of 1M NH OH 100 ml of 1M HCI acts like a basic buffer Statement II Ammonium acetate undergoes both cationic and anionic hydrolysis A I and II are true B I is true Il is false C I is false Il is true D I and II are false

Which of the following is a buffer solution AT 500 ml of 0 1 N CH COOH 500 mL of 0 1 N NaOH 500 ml of 0 1 N CH COOH 500 mL of 0 1 N HCI 500 ml of 0 1 N CH COOH 500 mL of 0 2 N NaOH 500 ml of 0 2 N CH COOH 500 mL of 0 1 N NaOH

1 Libermannnitroso test 2 Neutral FeCl solution 4 all of the above 3 Bromine water A balloon weighing 50kg is filled with 685 2 kg of helium at 1 atm pressure and 25 What wil pay load if it displaced 5108 kg of air 1 4372 8 kg 2 4422 8kg 3 5793 2 kg 4 5843 2 kg The number of isomers for the compound with molecular formula C BrCIFI is

In one litre container ethyl acetate is formed by the reaction between ethanol and acetic acid and the equilibrium is represented as CH COOH 1 C H OH CH COOC H 1 H O 1 At 293 K if one starts with 1 00 mole of acetic acid and 0 18 mole of ethanol there is 0 171 mole of ethyl acetate in the final equilibrium mixture Calculate the equilibrium constant 4 K 6 23 1 K 3 92 2 K 2 56 3 K 4 89

The indicator constant of phenolphthalein is approximately 10 10 A solution is prepared by adding 100 01c c of 0 01 N sodium hydroxide to 100 00 c c of 0 01N hydrochloric acid If a few drops of phenolphthalein are now added what fraction of the indicator is converted to its coloured form 1 2 3 2 4 3 17 12 2 9 4 11

How many milliliters of 0 200 M FeCl are needed to react with an excess of Na S to produce 1 04 g of Fe S if the product yield for the reaction is 60 A 50 mL B 72 mL C 83 mL D 96 mL f Nations

Find the ApH initial pH final pH when 100 ml 0 01 M HCI is added in a solution containig 0 1 m molesof NaHCO3 solution of negligible volume Ka 107 Ka 10 11 for H CO3 1 6 2 log3 2 6 log3 3 6 2log2 4 6 21 93

A 40 by 40 cm plate is inclined at an angle of 30 with the vertical and exposed to water vapor at 1 atm The plate is maintained at 98 C Calculate the heat transfer and mass flow rate of condensate

An equilibrium mixture in a vessel of capacity 100 litre contain 1 mol N 2 mol O2 and 3 mol NO Find number of moles of O2 to be added so that at new equilibrium the concentration of NO is 0 04 mol lit A B 101 18 Correct Answer 101 9 202 9

A certain mixture of HCI and CH3 COOH is 0 1 M in each of the acids 20 ml of this solution is titrated against 0 1M NaOH By how many units does the pH change from the start to the stage when the HCI is almost completely neutralised Ka for acetic acid 1 8 x 10 6 1 2 03 2 0 775 3 2 325 4 3 172

When equal volumes of 0 2 M AgNO and 1 M KCN solutions were mixed then at equilibrium concentration of Agt was found to be 10 M While when equal volumes of 0 2 M Zn NO solution and of 1 M KCN solution were mixed then at equilibrium concentration of Zn ion was found to be 10 12 M Then find the equilibrium constant K of following reaction 2 Ag CN J aq Zn aq Zn CN aq 2Ag aq Consider two equilibrium 2CL g 2H O g 4HCI g O g and N g O g 2NO g

Which of the following is a buffer solution O 500 ml of 0 1 N CH3COOH 500 mL of 0 1 N NaOH O 500 ml of 0 1 N CH3COOH 500 mL of 0 1 N HC1 O 500 ml of 0 1 N CH3COOH 500 mL of 0 2 N NaOH O 500 ml of 0 2 N CH3COOH 500 mL of 0 1 N NaOH

Which of the following combination can form an acid buffer A 100 ml of 0 1 M CH3COOH 100 ml of 0 1 M NaOH B 100 ml of 0 2 M NH4OH 100 ml of 0 3 M HCI C 100 ml of 0 2 M CH3COOH 100 ml 0 1 M NaOH D 50 ml of 0 1 M CH3COOH 50 ml of NOLL

Delta Go for the formation of phosgene according to the equation below is 53 9 kJ mol CO g Cl2 g COCI2 g Calculate the value of Kc A 2 8 X 109 B 2 2 X 10 10 C 1 8 X 1022 D 5 6 X 10 23 E 1 02

Suppose a 250 mL flask is filled with 2 0 mol of CH4 1 6 mol of CO and 0 30 mol of H This reaction becomes possible CH g H O g CO g 3H g Complete the table below so that it lists the initial molarity of each compound the change in molarity of each compound due to the reaction and the equilibrium molarity of each compound after the reaction has come to equilibrium Use x to stand for the unknown change in the molarity of CH4 You can leave out the M symbol for molarity initial change CH 0 X H O 0 CO O U H 0 Olo X S

79 Which of the following is a buffer solution 1 500 mL of 0 1 N CH3 COOH 500 mL of 0 1 N NaOH 2 500 mL of 0 1 N CH3 COOH 500 mL of 0 1 N HCI 3 500 mL of 0 1 N CH3 COOH 500 mL of 0 2 N NaOH 4 500 mL of 0 2 N CH3 COOH 500 mL of 0 1 N NaOH

class XIII Spartan Batch Chemical Equilibrium lonic Equilibrium 176 The solubility of AgBrO formula weight 236 is 0 0072 176 AgBrO HR 236 factu 0 0072 1000 mL g in 1000 mL What is the k sp 1 2 2 x 10 8 2 3 0 10 10 3 3 0 10 5 4 9 3 x 10 10 akam sp 1 2 2 x 10 8 2 3 0 10 10 3 3 0 x 10 5 4 9 3 10 10

4 9 3 x 10 10 177 What is the concentration of CH COOH aq in a solution 177 0 01 NHCH COO citer la face perpared by dissolving 0 01 mole of NH CH3COO in 11 H O Ka CH COOH 1 8 x 10 5 Kb H H 1 8 x 10 5 1 5 55 10 5 4 5 55 X 10 COOH aq Ka CH COOH 1 8 10 5 K 1 5 55 10 5 2 0 10 3 6 4 x 104 4 555 10 NH40H 1 8 10 5

1 NiSO4 2 BaS O3 3 PbS2O3 The general formula CnH O2 could be for open chain 1 diketones 2 Carboxylic acids 3 diols The ionic product of Ni OH 2 is 2 0 x 10 5 The molar solubility 1 3 2 x 10 2 2 2 0 x 10 3 3 4 34 x 10 2 4 CuSO4 4 dialdehydes of Ni OH 2 in 0 10 M NaOH 4 0 58 x 10

3 At constant pressure addition of helium to the reaction system N g 3H 2NH 3 8 1 Favours the formation of ammonia 2 Reduces the formation of ammonia 3 Does not affect the position of equilibrium 4 Reduces the dissociation of ammonia

103 Consider the nitration of benzene using mixed conc H SO4 and HNO3 If a large amount of KHSO4 is added to the mixture the rate of nitration will be 2 1 slower 2 unchanged 3 doubled 4 faster

E A 2 B 4 C 6 D 0 pk of a weak acid is 5 76 and pK of a weak base 5 25 what will be the pH of the salt formed by the two C 10 25 A 7 255 B 7 005 The hybridisation of Pin PO is the same as in D 4 25

4 The coordination number is 6 50 Equimolar solutions of HF HCOOH and HCN at 298 K have the values of Ka as 6 8x10 4 1 8x10 4 and 4 8x10 9 respectively What will be the order of their acidic strength 1 HF HCN HCOOH 2 HF HCOOH HCN 3 HCN HF HCOOH AAJ KA TOPPER 4 HCOOH HCN HE 1 Which of the following statements is not true regarding molecular orbital theory

fructose 6 phosphate glucose 6 phosphate K 1 97 What is AG for the reaction Kq measured at 25 C AG Incorrect If the concentration of fructose 6 phosphate is adjusted to 1 1 M and that of glucose 6 phosphate is adjusted to 0 55 M w is AG

A buffer solution is prepared by mixing 10ml of 1 0 M acetic acid 20ml of 0 5 M sodium acetate and then diluted to 100ml with distilled water If the pk of CH COOH is 4 76 What is the pH of the buffer solution prepared a 1 3 84 3 4 34 2 4 76 4 5 21

2AB g B g 2AB 2 8 The degree of dissociation is x and is small compared to 1 The expression relating the degree of dissociation x with equilibrium constant K and total pressure P is a 2K P 1 2 c 2K P P b K P d 2K P 3 2008

The solubility of salt in saturated aqueous solution of NH4KHPO3 is Question Type Single Correct Type 1 2 3 4 Ksp 1 3 Ksp 4 1 3 Ksp 1 4 Ksp 1 4

Upon mixing equal volumes of 0 02 M AgNO3 0 16 M KCN solutions Assume no hydroly ion Given Ag aq 2CN aq Ag CN aq Kc 10 8 A NO 0 01 M K 0 08 M C Ag CN 0 01 M In the above question B 4 Ag is about A 2 78 x10 18 M C No free Ag ions will be left in the solution B CN 0 06 M D All of these B 1 67 x 10 1 M D Cannot be determined C

At 100 K temperature A2 g is 50 dissociated into B g and C g as pel the reaction A2 g B g C g at 1 atm pressure The Gibbs energy change at this temperature is O 100 RIn3 O 100 RIn3 O 230 3 RIn3

If 20 mL of 0 1 M NaOH is added to 30 mL of 0 2 M CH3COOH pKa 4 74 the pH of the resulting solution is Question Type Single Correct Type 1 2 3 4 44 9 56 8 96

Formula AgBrO3 MgSO4 CaCO3 Solubility product 2 5 10 10 2 7 x 10 27 2 7 x 10 18 FeC 04 2 4 x 10 15 Which of the following salt having maximum solubility Question Type Single Correct Type 1 2 AgBrO3 MgSO4