Equilibrium Questions and Answers

8 The reaction A BC 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 2 3n 2 a FIN 3 4 n

In system A s 2B g 3C g at equilibrium in concentration of C is doubled then concentration of B at equilibrium will be 1 Double its original concentration 2 Half its original concentration 3 2 2 its original concentration 4 its original concentration

2020 2 2XY reaction was studied at a certain mperature In the beginning 1 mole of X was taken in a one litre flask and 2 moles of Y was taken in another 2 litre flask What is the equilibrium concentration of X and Y Given equilibrium concentration of XY 0 6 mol L 1 0 3 0 3 2 0 6 0 6 3 1 0 3 2 0 3

42 PCI g PCI g Cl g CE0047 In above reaction at equilibrium condition mole fraction of PCI is 0 4 and mole fraction of Cl is 0 3 Then find out mole fraction of PCI 1 0 3 2 0 7 3 0 4 4 0 6 48

Which of the following is a true statement 1 The ionisation constant and ionic product of water are same 2 Water is a strong electrolyte 3 The value of ionic product of water is less than that of its ionisation constant 4 At 298K the number of H ions in a litre of water is 6 023 x 10 1500

Initially taken Up to equilibrium 0 5 mol of P iated What would be the degree

3 AH positive 4 K K CE0028 26 The equilibrium constant for the reaction Br 2Br at 500 K and 700 K are 1 x 10 10 and 1 x 10 respectively The reaction is 2 Exothermic 1 Endothermic 3 Fast 4 Slow CE0029 H ce ve 1 3

Amount of H2 and 12 present CE0032 The equilibrium constant K for the reaction PCI g PCI g Cl g is 16 If the volume of the container is reduced to one half its original volume the value of K for the reaction at the same temperature will be 1 32 2 64 3 16 4 4 FO031

4 2N O K 3 5 x 103 mol L 1 2N2 g O2 gl CE0023 1 The equilibrium constant in a reversible reaction at a given temperature 1 Depends on initial concentration of the reactants 2 Depends on the concentration of the products at equilibrium 3 Does not depend on the initial concentrations 4 It is not characteristic of the reaction CE0024

122 Pre Medical Chemistry 22 Which one of the following statements is correct 2 about equilibrium constant 1 Equilibrium constant of a reaction changes with temperature 2 Equilibrium constant of a reaction depends upon the concentration of reactants with which we start 3 Equilibrium constant of a reaction 3Fe s 4H 0 FejO4 s 4H2 is same whether the reaction is carried out in an open vessel or a closed vessel 4 Equilibrium constant of a reaction becomes double if the reaction is multiplied by 2 2 throughout cro roon

7 In an experiment the equilibrium constant for the reaction A B C D is K when the initial concentration of A and Beach is 0 1 mol L Under the similar conditions in an another experiment if the initial concentration of A and B are taken 2 and 3 mol L respectively then the value of equilibrium constant will be K 2 K 3 K 1 4

E0028 x 10 10 31 The equilibrium constant of the reaction H g 1 g 2HI g is 64 If the volume of the container is reduced to one fourth of its original volume the value of the equilibrium constant will be 1 16 2 32 3 64 4 128 CE0035 HODE2 BATARGETICHEMENG MODULE SE ON

8 Consider the two gaseous equilibrium involving SO and the corresponding equilibrium constants at 299 K So 0 6 SO g K 450 g 4 SO g 20 g K The value of the equilibrium constants are related by 2 K K 1 1 K K K 3 K F1 4 K K

Which Oxide of Nitrogen is most stable N2 g 202 gl 1 2NO2 K 6 7 x 1016 mol L 1 2 2 NO K 2 2 x 1030 3 2 N O5 N O2 al 4 2N O3 K 1 2 x 10 34 mol 5 L 5 2N2 O 2Nzgl 502 igl 1033

027 ion 3 CaCl 4 All IE0039 HYDROLYSIS OF SALTS 34 At 90 C the pH of 0 1M NaCl aqueous solution is 2 7 3 7 1 7 4 0 1

A 15 0 mL sample of 0 013 M HNO3 is titrated with 0 017 M C2H5NH2 Determine the pH at these three points a At the beginning before C2H5NH2 is added b After adding 10 0 mL of C2H5NH2 c After adding 20 00 mL of C2H5NH2 please show work thank you

18 Consider the two gaseous equilibrium involving SO equilibrium constants and the corresponding at 299 K 50 0 50 K 450 g 4 SO g 20 g K The value of the equilibrium constants are related by 1 K K 2 K K 3 K K 1 4 K CE0020

17 Which of the following will occur if a 1 0 M solution of a weak acid is diluted to 0 01 M at constant temperature 1 Percentage ionisation will increase 2 H will decrease to 0 01M 3 K will increase 4 pH will decrease by 2 units 150018

For which reaction at 298 K the value of is K K maximum and minimum respectively a N O 2NO b 250 0 250 c X Y d A 3B 4Z 7C

ALLEN 11 In this reaction Ag 2NH Ag NH at 298K molar concentration of Ag Ag NH and NH is 10 10 and 10 The value of Kat 298K for this equilibrium 1 10 3 2 10 2 10 4 2 x 10 CE0012

7 lonic compound dissolves in a solvent if 1 Solvation energy lattice energy 3 Solvation energy lattice energy 2 Solvation energy lattic 4 None of these

13 For the reaction Cs CO g 200 g the partial pressure of CO and CO are 2 0 and 4 0 atm respectively at equilibrium The K for the reaction is 1 0 5 2 4 0 3 8 0 4 1 CE0015 14 For which reaction is K K

3 CE0002 EQUILIBRIUM AND CHEMICAL PROCESS x y reaction is said to be in equilibrium when 1 Only 10 conversion x to y takes place 2 Complete conversion of x to y takes place 3 Conversion of x toy is only 50 complete 4 The rate of change of x to y is just equal to the rate of change of y tox in the system CE0003 MOISE

25 K Fe CN is supposed to be 40 dissociated when 1M solution prepared Its boiling point is equal to another 20 mass by volume of non electrolytic solution A Considering molality molarity The molecular weight of A is A 1 77 3 57 2 67 4 47

CE0012 12 At 1000 K the value of K for the reaction A g 2B g 3C g D g is 0 05 atm The value of K in terms of R would be 1 20000 R 3 5 x 10 R MA 2 0 02 R 4 5 x 10 XR BAGET CE0014

Water enters a 50 L tank at a rate of 5 kg s and is withdrawn at a rate of 6 kg s The tank is initially half full Which statement of the following correctly describe the system Select one a The level of water in the tank will not change as this process is a Batch unsteady state process b The level of water in the tank will decrease as this process is a Continuous unsteady steady state process c The level of water in the tank will increase as this process is a Continuous unsteady steady state process Od The level of water in the tank will not change as this process is a Continuous steady state process

Using the Gibbs energy change AG 63 3 kJ Q 4 For the following reaction Ag CO 2Ag aq CO aq the Kap of Ag CO3 s in water at 25 C is R 8 314 JK 1 mol 1 1 3 2 x 10 26 3 2 9 x 10 3 2 8 0 x 10 12 4 7 9 x 10 ft Rad AG 63 3 kJ 5V Afford ad Ag CO 2Ag aq CO aq for 24 12 2 Ag CO s K R 8 314 JK mol 1 3 2 x 10 26 25 C 3 2 9 10 2 8 0 x 10 12 4 7 9 x 10

NEET UG 2019 26 A body weighs 200 N on the surface of the earth 28 How much will it weigh half way down to the centre of the earth 1 150 N 3 250 N 2 200 N 4 100 N

A 50 00 mL volume of 0 034M Ca NO3 2 is mixed with 50 00 mL of 0 082 NaF Derive a system of equations using mass and charge balance which when solved would yield the pH Ca2 F HF Assume that the following reactions are in equilibrium yes precipitation occurs CaF2 Ca2 2F KSP 10 10 5 HF H F Ka 10 3 18

Which of the following aqueous solutions are good buffer systems a 0 21 M hydroiodic acid 0 17 M sodium iodide b 0 28 M ammonium bromide 0 39 M ammonia c 0 34 M acetic acid 0 27 M potassium acetate d 0 19 M potassium hydroxide 0 30 M potassium chloride De 0 13 M hydrofluoric acid 0 20 M potassium fluoride

25 pts Consider a well insulated horizontal rigid cylinder that is divided into two compartments by a piston that is free to move but does not allow either gas to leak into the other side The piston is made of 5 kg of copper initially at the average temperature of the two gases at both sides Initially one side of the piston contains 1 m of N gas at 500 Copyright Hill Education Permission required for reproduction or display N 1 m 500 kPa 80 C He 1 m 500 kPa 25 C kPa and 80 C while the other side contains 1 m of He gas at 500 kPa and 25 C Now thermal equilibrium is establishe in the cylinder as a result of heat transfer through the piston Using constant specific heats at room temperature determine a the final equilibrium temperature in the cylinder and b the wasted work potential during this process What would your answer he if the piston were not free to move Take To 25 C

cell If the E for a given reaction has a negative value which of the following gives the correc relationships for the values of AG and K eap ho eq NEET Phase 2 2016 2 AG 0 K 1 1 AGO 0 Ka 1 AG Keq

An element X being with oxygen and CO present in air as X g O g XO g Kp 27 X g CO g XCO g Kp 104 When X at 1 atm is treated with air 25 of it is bound to CO g The partial pressure of CO g in air at equilibrium if partial pressure of O g in air equilibrium is 0 2 atm would be 1 1 9 104 atm 2 1 9 x 10 4 atm 3 2 08 x 104 atm

3 Metal sulfides like copper II sulfide are heated in air a process called roasting combustion to produce copper II oxide and sulfur dioxide an acidic precipitation pollutant What is the enthalpy change to roast one mole of copper II sulfide Value 4 pts

A diprotic acid H2A has acid dissociation constants of Ka1 2 72x10 4 and Ka2 3 75 10 12 Calculate the pH and molar concentrations of H2A HA and A2 at equilibrium for each of the solutions A 0 201 M solution of H2A 00301 M0 201 M solution of Na2A A

e of water to dissolve 1g will be Molecular weight 2 1 L Ag CrO is ution of At 20 C 3 4 9 10 4 4 9 x 10 7 APPLICATION OF SOLUBILITY PRODUCT K At 30 C In which of the one litre solution the solubility of Ag CO solubility product 8 x 10 12 will be maximum 1 0 05 M Na CO3 3 0 05 M AgNO3 3 2 Pure water 4 0 05 M NH The solubility product of three are given below Formula No 1 PQ PQ2 PQ3 3 The correct order of decre 1 3

64 If the concentration of CrO2 ion in a saturated solution of silver chromate will be 2 x 104 M solubility product of silver chromate will be 1 4 x 10 8 2 8 x 10 12 4 6 x 10 12 3 32 x 10 2 31 1 1 1 1 CUformula 1131

Two charges are placed as shown in figure Where should a third charge be placed so that it remains at rest 160 70cm 1 30 cm from 9e 3 40 cm from 9e 2 40 cm from 16e 4 1 or 2

Salicylic acid reacts with acetic acid to form aspirin acetyl salicylic acid A 0 106 molar solution of salicylic acid in water has a pH of 1 97 Calculate the K and pk of salicylic acid in water K i

4 6 x 10 12 mula mass 143 in water 100 mL of solution then 2 2 10 5 4 2 10 10 nd PZ have the same 11 75 3 s 2 4 20 4 The solubility product of CuS Ag S and Hgs are 10 37 10 44 and 10 54 respectively The solubility of these sulphides will be in the order 1 HgS Ag S CuS 2 Ag S HgS Cus 3 CuS Ag S HgS 4 Ag S CuS HgS xC 11 primum concentration of PbCl in water tration 3 sAgBrO sAg S 4 Can t predict 84 0 5 M HCl solution Fe Cu To pass which are precipitat 1 Cd 2 Fe 2 Sr 2 Hg 2 Cu 2 Fet

51 The decomposition reaction 2N O5 g 2N O4 g O g is started in a closed cylinder under isothermal isochoric condition at an initial pressure of 1 atm After Y x 10 s the pressure inside the cylinder is found to be 1 45 atm If the rate constant of the feaction is 5x 10 s assuming ideal gas behaviour the value of Y is 2019 Adv

104 In the following solutions the conc of different acids are given which mixture of the acid has highest pH M M M 1 10 H SO4 20 HNO3 10 HCIO 2 M H SO HNO 20 HCIO M 20 4 3 M 20 M 10 M M H SO4 10 M M HNO3 40 HClO4 M 11 7 OIO

4 6 x X ula mass 143 in water 00 mL of solution then 2 2 x 10 5 1 2 x 10 10 P7 have the same 75 3 s 2 4 s 2 The solubility product of CuS Ag S and Hgs are 10 37 10 44 and 10 54 respectively The solubility of these sulphides will be in the order 1 HgS Ag S CuS 2 Ag S HgS CuS 3 CuS Ag S HgS 4 Ag S Cus Hgs water 84

1 Cd 2 Fe 2 Sr 3 Hg 2 Cu 2 Fe 2 4 Cu 2 Sr 2 Fe 2 Solubility product of Mg OH is 1 x 10 11 At what pH precipitation of Mg OH will begin from 0 1 M Mg2 solution 2 5 1 9 3 3 4 7

s molecule at 173 Two monoatomic ideal gas at temperature T and etic energy at T are mixed There is no loss of energy If the mass of molecules of the two gases are m and m and number of their molecules are n and n respectively then temperature of the mixture will be HT0184 ar gas at same re m and m 1 3 T T n n n T n T n n 2 4 1 n n n T n T n n

The rate law for the decomposition of gaseous N O is 1 2NO O Reaction mechanism N O5 has been suggested as follows N O5 NO NO3 NO NO3k 2NO fast Keq 2 NO NO fast equilibrium 2 NO NO O slow 43 Order of the reaction is A 0 B 1 C 1 D 3 2 44 In 20 minutes 80 of N O is decomposed Rate constant is A 0 08 B 0 05 C 0 12 D 0 2 2 45 At the equilibrium state N O5 NO and NO concentrations are 0 2 0 4 and 0 4 M respectively k is

onoprotic acid base at half pka d 4 b c id is added in e increase in this acid which has a 2 0 05 3 0 2 4 0 5 123 How many moles of HCI must be removed from 1 litre of aqueous HCl solution to change its pH from 2 to 3 1 1 2 0 02 3 0 009 4 0 01 pH of 1 1 0 1

6 d 4 b c 113 In a solution of pH 5 more acid is added in order to reduce the pH 2 The increase in hydrogen ion concentration is 1 100 times 3 3 times 2 1000 times 4 5 times

7 The pH of the solution produced when an aqueous solution of strong acid pH 5 is mixed with equal volume of an aqueous solution of strong acid of pH 3 is 1 3 3 2 3 5 3 4 5 4 4 0 1

Calculate the pH of a weak acid solution quadratic equation Close Problem Calculate the pH of a 0 0419 M aqueous solution of nitrous acid HNO2 K 4 6 10 and the equilibrium concentrations of the weak acid and its conjugate base pH HNO lequilibrium M