Equilibrium Questions and Answers

For given reaction to notebolzeic 2B A2B A er to d If Keq of reaction is 15 2 and E A 2 A 0 34V Then calculate E B B will be HET INCOT 1 0 80 2 0 80 3 1 27 no 2

5 4 Br Given Enthalpy of ionization of two acids AH HCN 4 52 kJmol 1 AH CH COOH 2 1 kJmol Which relationship for the two acids is true 1 PK HCN pK CH3COOH 2 pK HCN pK CH COOH 3 pK HCN pK CH COOH 4 pK HCN 2 1 452 pK CH3COOH

Which of the following is the correct set of volume calculated by ideal gas equation and Vander Waal s equation respectively for 1 mole CO gas at 300K and 10 atmpressure R 0 0821L atm K mol 1 2 463 L 2 56 L 3 2 463 L 2 463 L 2 2 463 L 2 38 L 4 2 463 L 2 75 L

If K for the reaction N O 2NO is 0 66 then what is the equilibrium pressure of N O4 Total pressure at equilibrium is 0 5 atm 1 0 168 2 0 322 3 0 1 4 0 5

45 0 02M of pyridium hydrochloride having H is 3 6 x 104 what is ionisation constant o pyridine 1 1 54 x10 3 1 54 x 10 6 2 1 54 10 7 4 1 54 x 10 5

200 ml of 0 005 M AgNO reacts with 300 mL of 0 01 M KCl If K of AgCl is 1 8 x 10 10 Then maximum conc of Ag in mixture is sp 1 2 x 10 8 2 4 5 x 10 8 3 4 8 x 10 5 4 1 34 x 10 5

For the MN blood group system the frequencies of M and N alleles are 0 7 and 0 3 respectively The expected frequency of MN blood group bearing organisms is likely to be 2 49 4 58 1 42 3 9

Dissociation constant of acetic acid is 1 8 x 10 5 Calculate percen dissociation of acetic acid in 0 01 M solution

For a first order reaction 2A g 2B g C g the initial pressure is P and after time t total pressure of reaction mixture becomes P The rate constant is 2 303 1 k log t 2 k In In 3 k In P 0 t 3P 2P 4 k In Po P P Po 2P P 2Po

4 0 005 mole gives a solution of 3 0 10 mole 9 Which combination maximum buffer capacity 1 100 ml 0 1M HCN 100 ml 0 1M KOH 2 100 ml 0 1M HCN 100 ml 0 2M KOH 3 100 ml 0 2M HCN 100 ml 0 05M KOH 4 100 ml 0 2M HCN 100 ml 0 1M KOH The total number of different kind of buffer

0 02M of pyridium hydrochloride having H 5 55x10 6 what is ionisation constant of pyridine 1 1 54 x10 9 2 1 54 x 10 7 3 1 54 x 10 6 4 1 54 x 10 5 16

an aqueous solution of 0 01 M CH COOH has Van t Hoff factor 1 01 If pH log H pH of 0 01 M CH COOH solution would be

K is 9 atm for the reaction LICI 3NH s LICI NH s 2NH g at 40 C How many moles of ammonia must be added at this temperature to a 5 litre flask containing 0 1 mole of LICI NH in order to completely convert the solid to LICI 3NH Multiply the obtained answer by 100 Round off the answer to the nearest integer

Determine the concentration of H3O ion in a solution containing 2 x 10 M HOCI and 2 x 10 M NaOCI Given Dissociation constant of HOCI 1 5 x 104 Report your answer after multiplying by 2000

10 Hydrogen a moles and iodine b moles react to give 2x moles of the HI at equilibrium The total number of moles at equilibrium is 1 a b 2x 2 a b b 2x 3 a b 4 a b X

PCI g is 40 dissociated when pressure is 2 atm It will be 80 dissociated when pressure is approximately 1 0 2 atm 3 0 8 atm 2 0 5 atm 4 0 6 atm

1 mol PCI is heated in a closed container of 1 L capacity At equilibrium 20 PCl is not dissociated what should be the value of K C 1 3 2 2 2 4 3 4 2 4 1 4

At 60 C dinitrogen tetroxide is fifty percent dissociated Calculate the standard free energy change at this temperature and at one atmosphere

In a reaction A g 4B g 2AB g AH 0 The formation of AB g will be favoured by 1 Low temperature and high pressure 2 High temperature and high pressure 3 Low temperature and low pressure 4 High temperature and low pressure

The pKa of HCN is 9 3 The pH of a solution prepared by mixing 2 5 mol KCN and 2 5 mol HCN in water and making up to total volume to 500 mL is 1 9 3 2 7 3 3 10 3 4 8 3

The solubility product of CaSO is 2 4 x 10 When 100 mL of 0 01 M CaCl and 100 mL of 0 02 M Na SO are mixed then 1 Na SO will precipitate 2 Both will precipitate 3 CaSO will precipitate 4 None will precipitate

In a 0 25 L tube dissociation of 4 mol of NO is take place If its degree of dissociation is 10 The value of K for reaction 2 NO N O is 1 1 18 2 1 8 3 1 16 4 1 32

In the light of Le Chatelier principle 1 an endothermic reaction is facilitated at high temperature 2 an exothermic reaction is facilitated at high temperature 3 a gaseous reaction A2 3B 2AB3 is facilitated at low pressure 4 a gaseous reaction A2 B2 2AB is facilitated at high pressure

Final pH of the solution obtained on mixing 100 ml 0 01M HCI and 100 ml 0 01M CH3COOH Ka 10 5 is log5 0 7 1 2 3 3 4 3 2 3 7 4 4 5

Chemistry 36 K of Sr OH is x then calculate value of OH in saturated solution 1 3x 4 3 x 2 2 2 4 4 X

For the reaction PCI g PC13 g Cl g the forward reaction at constant temperature of favoured by 1 Introducing an inert gas at constant volume 2 Introducing Cl gas at constant volume 3 Introducing an inert gas at constant pressure 4 None of the above

31 In which of the following case pH is greater than 7 1 50 ml of 0 1 M HCI 50 ml of 0 1 M NaCl 2 50 ml of 0 1 M H SO4 50 ml of 0 2 M NaOH 50 ml of 0 1 M CH3COOH 50 ml of 0 1 M KOH LOT 4 50 ml of 0 1 M HNO3 50 ml of 0 1 M NH3

5 Solubility of Ba OH in pH 11 is 10 8 What the solubility product of Ba OH 2 1 10 11 2 10 14 3 10 9 4 10 12

What weight of CO is required to form Re CO 10 from 3 g of Re2O7 according to given reaction Re O7 CO Re CO 10 CO Atomic weight of Re 186 2 C 12 and O 16 convert in nearest integer

Given the following reactions involving W X Y and Z are i X Z ii iii W Z W Z iv W Y No reaction On arranging W X Y Z in order of their increasing ability as reducing agent the correct option obtained is X Z X Z Y X No 1 X Z Y W 2 Z W Y X 3 Z X Y W reaction

H O B OH 4 H K 5 9 10 10 Calculate pH of 0 3 M boric acid log 1 77 0 13 MIXTURE OF TWO OR MORE ACIDS BASES Q 12 Calculate pH of following solutions 0 1 M H SO4 50 ml 0 4 M HCl 50 ml log 0 3 0 522 b 0 1 MHA 0 1 MHB K HA 2x 10 5 K HB 4 x 105 log 6 0 39 Q 13 Calculate H and CHCI COO in a solution that is 0 01 M in HCl and 0 01 M in CHCI COOH Take K 3 x 10 2 30 5 5 Q 14 Calculate H CH COO and C H O in a solution that is 0 02 M in acetic acid and 0 01M in benzoic acid K acetic 1 8 x 10 5 K benzoic 6 4 10 5 POLYPROTIC ACIDS BASES Q 15 What are the concentration of H H C O4 HC 0 and C 02 in a 0 1 M solution of oxalic acid K 10 2 M and K 10 5 M Q 16 Calculate H H PO HPO and PO in a 0 01M solution of H PO4 Take K 10 K 108 K 10 13 HYDROLYSIS the OH concentration of a 0 08 M solution of CH COONa K CH COOH 1 8 10 5 10 51

3 a Water gas a mixture of H and CO is an important industrial fuel produced by the reaction of steam with red hot coke essentially pure carbon Write the expression for the equilibrium constant for the reversible reaction 0 C s H O g CO g H g AH 131 30 kJ Assume that equilibrium has been established and predict how the concentration of each reactant and product will differ at a new equilibrium if 1 more C is added 2 H O is removed 3 CO is added 4 the pressure on the system is increased 5 the temperature of the system is increased

Ap Ke following reaction 1 PCI 2 2SO O 3 N 3H 2NH 2 4 2 and 3 both log log RT 0 is true relationship for the PCl Cl 2SO

2 The hydrogen ion concentration of a 10 8 M HCI aqueous solution at 298 K K 10 14 is W AIPMT Prelims 2006 2 1 0525 10 7 M 4 1 0 10 8 M 1 1 0 x 10 6 M 3 9 525 x 10 8 M

123 Buffering action of a mixture of CH COOH and CH COONa is maximum when the ratio of salt to acid is equal to 1 1 0 3 10 0 2 100 0 4 0 1

If the forward rate constant of reversible reaction is 0 16 and backward rate constant is 4 104 then the equilibrium constant will be 1 2 25 x 10 6 2 2 5 10 5 3 4 x 10 6 4 4 x 10 5

31 The unit of equilibrium constant Ke for the reaction A B C would be a mol L c mol L b mol L I d no unit

Two substances A and B are present such that A 4 B and half life of A is 5 minute and that of B is 15 minute If they start decaying at the same time following first order kinetics how much time will the concentration of both of them would be the same 1 15 minute 2 10 minute

4 5 4 Q 3 50 mL of 0 2 M ammonia solution is treated with 25 mL of 0 2 M HCl If pK of ammonia solution 4 75 the pH of the mixture will be JEE MAIN Online 2017 1 8 25 2 4 75 3 9 25 4 3 75

The number of moles of KMnO reduced by one 4 mole of KI in alkaline medium is SVILD 1 One 2 Two 3 Five 4 One fifth

72 In a reaction 4 mole of electrons are transferred to one mole of HNO when it acts as an oxidant The possible reduction product is 1 1 2 mole N 2 1 2 mole N O 4 1 mole NH 3 1 mole of NO

112 The reaction N O4 g 2NO2 g is started with 0 8 moles of N O4 in a one litre vessel What is the equilibrium concentration of NO if equilibrium constant is 0 00466 at 298 K a 0 06 M c 0 74 M b 0 03 M d 0 36 M

Two moles of gas A are mixed with two moles of gas B in a flask of volume 1 lit If at equilibrium 0 5 moles of A are obtained Then find out K for reaction 1 12 3 4 A g B g 2AB g 9 4 36

2 0 9 L 3 2 0 L 4 9 0 L Q 11 If Ksp of CaF2 at 25 C is 1 7 x 10 10 the combination amongst the following which gives a precipitate of CaF is JEE MAIN online 2012 1 1 x 10 2 M Ca2 and 1 x 10 5 M F 3 1 x 10 3 M Ca2 and 1 x 10 5 M F 2 12 The pH of a 0 1 molar solution of the acid Hi AIEEE 2013 2 1 x 10 4 M Ca2 and 1 x 104 MF 4 1 x 10 2 M Ca2 and 1 x 10 3 M F

In the reactions A s B g C g and D s E g F g total pressure at equilibrium are 80 atm and 40 atm respectively then ratio of their equilibrium constants is

For conductivity extrapolation of o not possible by of a versus C curves to zero concentration 1 KCI 3 NaCl 2 NH OH 4 K SO4

22 Which of the following solution will have pH close to 1 0 A 100 ml of M 100 HCl 100 ml of M 10 NaOH B 55 ml of M 10 HCl 45 ml of M 10 NaOH C 10 ml of M 10 HCI 90 ml of M 10 NaOH D 75 ml of M 5 HCI 25 ml of M 5 NaOH

A X3 Kp 1 08 x 10 23 sp Q 49 Determine the solubility of AgCl in 0 1 M BaCl Kp for AgCl 1 10 10 sp

38 An aq solution of phenol is weakly acidic Ka of phenol at 298 K is 1x 10 10 The degree of dissociation of 0 05 M phenol in a 0 01 M sodium phenolate solution is 1 0 S 1 5 10 8 802 2 2x10 6 HOOOH 3 5 10 10 4 1 10 8

Which one of the following arrangements represents the correct order of solubilities of sparingly soluble salts Hg Cl Cr SO4 3 BaSO4 and CrCl respectively JEE MAIN Online 2013 1 1 K sp K sp 108 K 2 K sp sp 27 I K 3 K 3 K sp 108 27 K 3 sp 4 2 K K K sp 27 4 K sp 108 K sp 27 Ksp K sp 108 sp 4