Equilibrium Questions and Answers

Solubility of AgCl in water 0 01 M CaCl 0 01 M NaCl and 0 05 M AgNO are S S2 S3 and SA respectively then a S S S3 S4 c S S S3 S4 b S S3 S SA d S S3 S4 S

The dissociation pressure of silver oxide at 4450C is 207 atm Calculate DGo for the formation of 1 mole Ag2OC metal and oxygen at this temperature log 207 2 315 Report your answer in Kcal and round of the value to nearest integer

7 Find the concentration of H after mixing 20 ml 0 1M CH COOH and 10 ml 0 1 M NaOH Given K for CH COOH 1 7 x 10 5 302 a 3 1 1 7 x 10 5 2 3 4 x10 5 3 3 4 x 10 6 4 1 7 x 10 4

a NaOH CH COOH b HCI NH 3 41 What indicator should be used for the titration of 0 10 M KH BO with 0 10 M HCI K H BO 7 2 x 10 10 log 702 0 441 cid form of the indicator is red the basic form The acid

CH g 20 g CO g 2H O A H 170 8 kJ mol 1 Which of the following statements is not true 1 At equilibrium the concentrations of CO g and H O l are not equal 2 The equilibrium constant for the reaction is given by Kp CO CH410 3 Addition of CH4 g or O g at equilibrium will cause a shift to the right 1 Th

What is the effect of the reduction of the volume of the system for the equilibrium 2C s O g 2CO g Page nova A The equilibrium will be shifted to the left by the increased pressure caused by the reduction in volume B The equilibrium will be shifted to the right by the decreased pressure caused by the reduction in volume C The equilibrium will be shifted to the left by the increased pressure caused by the increase in volume D The equilibrium will be shifted to the right by the increased pressure caused by the reduction in volume

Q 4 95 B H O C NO3 Out of the following amphiprotic species in aqueous medium are I HPO II OH H PO A I III IV B I and III C III and IV When ammonia is added to water it decreases the concentration D H O and NO3 IV D All of which of HCO

D At 27 C N2O4 g dissociates 40 into NO2 g the equilibrium vapour density of the mixture is 1 32 85 2 40 26 3 46 4 72 41

0 9 What would be the pH of a solution obtained by mixing 5 g of acetic acid and 7 5 g of sodium acetate and making the volume equal to 500 mL JEE MAIN Online 2013 Ka 1 75 x 10 5 pKa 4 76 1 4 76 pH 5 0 3 pH of solution will be equal to pH of acetic acid 2 pH 4 70 4 pH 4 70

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 1 M the weakest acid is 1 HW Hol 2 HX XZ 4 HZ

of a gas is found to be 5 46 g dm at 27 C at 2 bar pressure What will be its density at STP

Mixture of ester and HCl is titrated with NaOH using phenolphthalein as an acidic indicator at end point pink color dissappear after some time due to 1 CH COOH is formed 2 Due to weak acedic nature of CH OH 3 Regeneration of HCI LO 4 Due to ionization of phenolphthalein

0 The total number of different kind of acidic buffers obtained during the titration of H PO with NaOH are A 3 B 1 C 2 D 0

The solubility of a salt of weak acid AB at pH 3 is Y x 103 mol L The value of Y is Given that the value of solubility product of AB Ksp 2 x 10 10 and the value of ionization constant of HB K 1 10 2018

39 The yield of product in the reaction 2A g B g would be lower at A low temperature and low pressure C low temperature and to high pressure IIZI co pageno 1 2C g QkJ B high temperature high pr D high temperature low pre

46 If pK for CN at 25 C is 4 7 The pH of 0 5M aqueous NaCN solution is 1 12 2 10 3 11 5 4 11

The enthalpy change for a reaction does not depend upon a use of different reactants for the same products b the nature of intermediate reaction steps c the differences in the initial and final temperatures of involved substances d the physical sate of reactants and products

144 At temperature T a compound AB g dissociates according to the reaction 2AB g 2AB g B g with a degree of dissociation x which is small compared to unity Deduce th expression for x in terms of the equilibrium constant Kp and the total pressure

Hydrolysis of sucrose is given by the following reaction Sucrose H 0Glucose Fructose If the equilibrium constant K is 2 10 at 300 K the value of AG at the same temperature will be 2 3 4 8 314 J mol K 1x300 Kx ln 2 1013 8 314 J mol K 300 K ln 2 101 8 314 J mol K 300 K In 3 101 8 314 J mol K 300 K ln 4 1013

2 55 N 10 acetic acid was titrated with B 0 05 56 When 20 ml of M 20 N 10 the pH of the solution will be K 10 A 5 log 1 3 5 5 log 3 C 5 log 1 3 5 5 log 3 C 0 05 NaOH When 25 50 and 75 of titration is over then 0 100 B 5 log 3 4 5 log 1 3 D 5 log 1 3 4 5 log 1 3 NaOH are added to 10 ml of D 2 5 M HC

76 For which of the following reactions K may be equal P to 0 5 atm A 2H1 H 1 C N 3H 2NH B PCI D 2NO PCI Cl N O

XeOF 2HF constant K XeO XeFXeOF XeO F constant XeF H 0 K Then equilibrium constant for the reaction XeO4 2HF XeO F H O will be K K 4 K K 1 K Ans 3 2 K K 3 K TE 5 PRO AMERA

2 gm FeSO is completely oxidised by acidic 4 0 05M KMnO solution then what will be 4 volume of KMnO is required Fe 56 S 32 O 16 1 0 10 lit 2 0 20 lit H

Which of the following statement s is are correct a The pH of 1 0 108 M solution of HCl is 8 8 b The conjugate base of H PO4 is HPO c Autoprotolysis constant of water increases with temperature 1998 2M d When a solution of a weak monoprotic acid is titrated against a strong base at half neutralisation point pH pKa

20 0 grams of CaCO3 s were placed in a closed vessel heated maintained at 727 C under equilibrium CaCO3 s CaO s CO g and it is found that 75 of CaCO was decomposed What is the value of K The volume of the container was 15 litres Changes in

100 mL of 0 01 M KMnO4 oxidizes 100 mL H O in acidic medium Volume of same KMnO4 required in alkaline medium to oxidize 100 mL of same H O will be 500 b mL 3 d None of these a c 100 3 300 5 mL mL

Ex 16 Equal volume of 0 2 M NH4OH or ammonia and 0 1 M H SO4 are mixed Calculate pH of final solution Given K of NH3 1 8 x 105 at 25 C

The H ion concentration in 0 001 M acetic acid is 1 34 x 104 g ion L The H ion concentration of 0 164 g of CH COONa is added to a litre of 0 001 M CH COOH will be 1 9 x 10 6 3 4 5 x 10 6 2 18 x 10 6 4 5 x 10 6

Reaction is Fe SO4 3 BaCl2 BaSO4 FeCl3 How many moles of BaCl is needed to produce mole of FeCl C mole A m B mole m D 2 moles

A 1 litre container contains 2 moles of PC1 initially If at equilibrium K is found to be 1 the degree of dissociation of PCI is C A 1 C 1 2 B 1 D 50

150 The total number of different kind of buffers obtained during the titration of H PO with NaOH 3 4 2 1 3 2 4 0 are 1 3

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

78 Read the following i When a solution of a weak monoprotic acid is titrated against a strong base at half neutralization 1 point pH pK 2 PK a ii A buffer has maximum buffer capacity when the ratio of salt to acid is 10 iii In a mixture of waek acid and its salt the ratio of concentration of salt to acid is increased ten fold The pH of the solution would Increase by one unit iv An aqueous solution of K SO4 has pH nearly equal to 7 Select the correct code for above B TFTT A TTTT Read the follow 4 C FTFT D FFTT

The solubility product of AgBr at 25 C is 2x10 mol L The solubility of AgBr in 102M solution of CaBr is 1 102 M 2 10 M 3 10 5 M 4 2x10 M

The preparation of SO g by raction SO g O g SO g 20 0 is an exothermic reaction If the preparation follows the following temperature pressure relationship for its yield then for temperatures T T T3 The correct option is 1 T3 T T 2 T T T3 3 T T T3 2 4 Nothing could be predicted about temperature through on yield 50 40 30 20 10 T T T 1 2 3 4 Pressure atm

For the reaction AB g A g B g AB is 33 dissociated at a total pressure of p Therefore p related to K by one of the following options P JAIPMT 201 1 p K 3 p 4K P 2 p 3K 4 p 8K P

43 Which of the following mixture act as buffer solution 100 128 1 100 ml of 1 M CH COOH 25 ml 5 M NaOH 20 2 150 m 0 1 M HCOOH 20 ml 1 M KOH Q 481 200 ml 0 5 M NH OH 50 ml 2 M H SO 4 100 ml 1 M NH OH 40 ml 1 M HCL

at 27 C then find the NH HS s NH 9 N 9 NH g H S g 3 N g H g KP 16JC11020 2 mol NH HS s is taken 50 of this is dissociated till at equilibrium in 1 litre container Find moles of N are found finally KP if C

sp We have taken a saturated solution of AgBr K of AgBr is 12 10 14 When 10 7 mole of AgNO3 are added to 1 litre of this solution then conductivity specific conductance of this solution is find as 11x x 10 7 S m units Find the value of x Given molar conductance of Ag Br and NO are 6x10 Sm mol 8 10 3 Sm mol and 7 10 Sm mol

When solid NH4HS is vaporized and maintained at 20 C the following equilibrium established NH4HS s NH3 g H S g and the total pressure is 0 4 atm When vaporiz in the presence of NH3 in a closed vessel at 20 C the partial pressure of NH3 was 0 5 atm Calculate under equilibrium the mole fractions of NH3 g and H S g A 0 93 0 07 B 0 6 0 4 C 0 75 0 247 D 0 66 0 34

Which of following will have maximum pH 1 Human saliva 3 Human blood 2 Black coffee aley 4 Gastric juice

2 5 mL of M weak monoacidic base K 1 10 at 12 5 25 C is titrated with 217 15 M HCl in water at 25 C The concentration of H at equivalence point is Kw 1x 10 14 at 25 C a 3 7 x 10 13 M c 3 2 x 10 2 M b 3 2 x 10 7 M d 2 7 x 10 2 M 2008 3M

pH of a dilute solution of HCl is 6 95 Calculate molarity of HCl solution 6 95 11 22 10 8 10 7 058 90 10 8 10 C lution K NH

A 100 ml flask containing O at 1 2 atm and 300 K is connected to a 250 ml flask containing NO g at 0 6 atm and 300 K by means of a narrow tube of negligible volume when they combine quantitatively to form NO Finally NO g dimerized partially into N O4 g and pressure inside the flask was found to be 0 41 atm at the same temperature Find dimerization of NO as 2NO g N O g

51 A At equilibrium 1M 1 3 2 2 2 1 B 1M Volume of vessel is 1L 1 mole of D is added from out side Equilibrium was re established keeping temperature constant The amount of C reacts to establish equilibrium is 2 2 1 2 C 2M 4 2 1 2 2 2 2 1 D 1M

Find the concentration of H after mixing 20 ml 0 1M CH COOH and 10 ml 0 1 M NaOH Given K for CH COOH 1 7 x 10 5 a 2 3 4 x10 5 4 1 7 x 10 4 1 1 7 x 10 5 3 3 4 x 10 6

6 HY is a weak acid K 105 It forms a salt NaX 0 1M on reacting with caustic soda The degree of hydrolysis of NaX is How nin 2004 1M a 0 01 b 0 0001 c 0 1 d 0 5

7 11 50 ml of 0 5 N HCN is mixed with 50 ml of 0 5 N KOH If pK for HCN is taken as 6 then the pH of the resulting solution will be 1 7 0 42 9 7 6

49 The boiling point of an aqueous solution of a non Im volatile solute is 100 15 C What is the freezing good point of an aqueous solution obtained by diluting the above solution with an equal volume of water The values of K and K for water are 0 512 and 1 86 K molality b 1 0 544 C 3 0 272 C 2 0 512 C 4 1 86 C

3 Which one of the following condition will favour forward process in the given reaction N g 3H g 2NH g ArH 0 1 High temperature and high pressure 2 Low temperature and high pressure 3 High temperature and low pressure 4 Low temperaturn