Equilibrium Questions and Answers

68 Determine the empirical formula of a compound that contains 39 S 58 5 O and 2 5 H by mass 1 H SO 3 H S O 2 H SO 4 H SO

The 102 Consider the following reversible reaction of X at an initial concentration X values of the rate constants are k 2 s and k 18 X c b A plot of concentration of X and Y as function of time is a X o X o X o Concentration Concentration Concentration t Meg Xe Yleq Xleq Xleq ea Yea eq

4 45 1 575 6 2 287 8 FIAH 47 What amount of energy in KJ is released in the combus 47 11 6 tion of 11 6 gm of C4H10 9 2CH g 130 g 8CO2 g 10H O AH 5756 KJ 2 800 76 3 182 4 57 56 AGJ no On TDS 4 0 11 3qm ey 36 14 AR F 2C4H10 1 575 2 287 3 18 4 57 Het 1 til energy of an electron in Het is 6 8 eV The 48 4 30 9

For the cell prepared from electrode A and B Electrode A Cr 02 Cr Ered 1 33 V and Electrode B Fe 3 Fe2 Ered 0 77 V Which of the following statements is correct a The electrons will flow from B to A when connection is made 9 b The e m f of the cell will be 0 56 V c A will be positive electrode BB d All of the above 1 33 8 27 cathode High val anode low

Which of the following is incorrect 1 Solid equilibrium 2 17 90 60 liquid both phase exist only at one value of temperature 2 Liquid vapour both phase may exist equilibrium at a given temperature and pressure 3 Solubility of solid in liquid remain same at given temperature 4 The solubility of gas in a liquid is directly proportional to partial pressure of the gas present above the surface of the liquid

pH of the resultant solution made by mixing 500 mL of 0 2 M NH4OH with 500 mL of 0 1 M HCI solution is pKb NH4OH 4 7 4 7 3 4 10 6

1 mole of monoatomic ideal gas undergoes a reversible cyclic process Given log2 0 3 R 2 cal mol K A P atm 5 1 10 8 21 16 42 V L Select correct option s B C C A NG for process AB 4 606 kcal B 82 1 2SBC SCA 0 6cal K SH C 4 5kcal

An aqueous solution contains an unknown concentration of Ba2 When 50 mL of a 1 M solution of Na2SO4 is added BaSO4 just begins to precipitate and the final volume of solution is 500 mL The solubility product of BaSO4 is 1 x 10 10 What is original concentration of Ba 5 x 10 M 2 10 M 1 1 10 M 1 0 10 10 M

If 270 0g of water is electrolysed during an experiment with 75 current efficiency then 168L of O2 g will be evolved at anode at 1 atm and 273 K total 504L gases will be produced at 1 atm and 273 K 336L of H2 g will be evolved at cathode at 1 atm and 273 K 45 F electricity will be consumed

Consider the following equilibrium in a closed container N O4 g 2NO g At a fixed temperature the volume of the reaction container is halved For this change which of the following statements holds true regarding the equilibrium constant K and the degree of dissociation a a Neither K nor a changes P b Both K and a change P c K does not change but a changes P d K changes but a does not change

In acid rain in Delhi it was found that 1 L rain water consist of 2 463 L equimolar mixture of SO3 NO2 gas dissolved at a partial pressure of 0 1 atm Find out the pH of the solution if HNO2 prod is 60 dissociated under given condition at 27 C R 0 0821 L atm mol K log 1 8 0 Rate this qu Your Answer Unattempted Correct Answer

4 34 5 1 g NH4 SH is introduced in 3 0 L evacuated flask at 327 C 30 of the solid NH SH decomposed to NH3 and H S as gases The K of the reaction at 327 C is R 0 082 atm mol K molar mass of S 32 g mol molar mass of N 14 g mol

89 A weak acid HX has the dissociation constant 1 x 10 M It forms a salt NaX on reaction with alkali The degree of hydrolysis of 0 1 M solution of NaX is 2 0 15 1 0 0001 3 0 01 configuration 90 When the following aldohexose exists in its D stereoisomers in its pyranose form is 1 2 2 4 3 6 4 0 1 the total number of 4 8

B Which of these molecules best relate to the MS spectrum with m z 89 NH2 NO2 a C 1 4 43 TOO 80 Relative abundance 50 30 20 46 M 89 1 10 15 20 25 30 35 40 45 50 55 60 1 90 70 65 75 BO 85 95 m

Consider the reaction below at equilibrium H O g C s CO g H g If the temperature is kept constant while the pressure is increased by compressing the mixture the equilibrium will If some carbon is removed the equilibrium will shift to the right shift to the left Oshift to the right remain unchanged Oshift to the right shift to the right O shift to the left shift to the left Oshift to the left remain unchanged

7 The equilibrium constant K for the following reaction is 1 47 x 10 H O FqHF9 H 0 F HF tequilibrium which of the following statements about the reaction is true A B C D The concentration of H 0 and F would be much larger than HF The concentration of HF would be much larger than H3O and F The concentration of H O F and HF would be approximately equal K has no effect on concentration

Under the right conditions ammonia can be converted to nitrogen monoxid NO by the following reaction NH3 O NO H O How many grams of H O could be formed from a mixture of 51 g of NH and 48 g of O

lution contains 10 2 MCF 10 M Br and 0 01 CrO2 AgNO solution is slowly added to the ution of these ions Predict the color of the precipitate that first forms iven K AgC1 10 1 Ksp AgBr 10 12 K Ag CrO 10 14 sp sp Red B White C Yellow D Green

For the reaction AB g A s 2AB g following graph is obtained InK L 1 T Which of the following will increase the concentration of AB g at equilibrium A Adding more of A s B Increasing temperature C Adding inert gas at constant pressure we of

14 Consider the reaction A B at 1000 K At time the temperature of the system was increased to 2000 K and the system was allowed to reach equilibrium Throughout this experiment the partial pressure of A was maintained at 1 bar Given below is the plot of the partial pressure of B with time What is the ratio of the standard Gibbs energy of the reaction at 1000 K to that at 2000 K Partial Pressure of B bar 115 100 50 10 time

The free energy of formation of NO is 78 kJ mol at the temperature of an automobile engine 1000 K What is the equilibrium constant for this reaction at 1000K N 8 O g NO 8 Anti log 0 9263 8 459

At a certain temperature this reaction establishes an equilibrium with the given equilibrium constant Kc 3A g 2B g 4C g Kc 1 73x1029 If at this temperature 2 10 mol of A and 3 90 mol of B are placed in a 1 00 L container wha are the concentrations of A B and Cat equilibrium

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

The correct order of increasing hydration energy of the following conjugate bases of oxoacids of chlorine is 1 CIO CIO CIO CIO 2 CIO CIO CIO CIO 3 CIO CIO CIO CIO 4 CIO CIO CIO CIO

The air pollutant NO is produced in automobile engines from the high temperature reaction N2 g O2 g 2NO g Kc 1 7x10 3 at 2300 K Calculate the equilibrium concentration of NO if the initial concentrations are 2 23 M N2 and 0 55 M O2 This N2 02 concentration ratio is the ratio found in air

The molar conductivity of 0 02 M HCOOH is 40 4 S cm mol If A H 350 S cm mol and m A HCOO 54 S cm mol then dissociation constant of HCOOH is 1 2 22 x 10 3 3 2 22 x 10 5 2 2 22 x 10 4 4 1 22 x 10 FC0204

Your Answer Answer Question 9 5 points 41 Listen 90 0 mL of 0 30 M HF K 7 2 x 10 is titrated with 5 0 mL of 0 60 M NaOH Calculate the pH at this point in the titration Your Answer

1 a Sciff s base 2 an immine 3 an amine 4 an enamine When 0 1 mol of CH3NH2 ionisation constant K 5 x 10 is mixed with 0 08 mol HCI and the volume is made up to 1 litre Find the H of the resulting solution Given log2 0 3 3 1 23x10 2 2x10 1 8x10 4 8x10 A compound contains 1 08 mol of Na 0 539 mol of Cu and 2 16 mol of F Its aqueous solution shows osmotic pressure which is three times that of urea having same molar concentration The formula of the compound in t

500 mL of 0 150 M AgNO3 solution were added in 500 mL of 1 09 M Fe solution and the reaction is allowed to reach an equilibrium at 25 c aq Fe Ag s Ag 2 3 aq Fe aq For 25 mL of the final solution 30 mL of 0 0832 M KMnO4 were required for oxidation Calculate equilibrium constant M of the reaction at 25 C Report your answer by rounding it up to nearest whole number

From now on we will not check the intermediate steps What is the value of k at 15 C k time s 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 absorbance 0 574 0 577 0 551 0 542 0 540 0 527 0 546 0 535 0 504 0 505 0 494 0 491 0 498 0 464 0 465 0 460 0 459 0 443 0 458 0 451 0427

The ratio of acid strength of HOCN and HCN is about Given K of HOCN 1 2x10 and K of HCN 4 2x10 10 1 535 1 2 1 535 3 2 86 10 1 4 2 86 10 1

The enthalpy of formation of NH3 g as per the following reaction is 46 11 kJ mol at 298 K N g 3H g 2 NH3 g Calculate the value of enthalpy of formation of NH3 g at 100 C The Co JK mol values are given as N g 29 12 H g 28 82 NH3 g 35 06 Assume the given heat capacity values to be temperature independent in the range

What is the concentration of Ba 2 when BaF2 Ksp 1 0 x 10 6 begins to precipitate from a solution that is 0 30 M F Question Type Single Correct Type 19 0 10 7 2 3 3 x10 5 3 1 1 x 10 5

equilibrium NH HS s NH3 g H S g A sample of solid NH HS is placed in a closed vessel and allowed to equilibrate Calculate the equilibrium partial pressure atm of NH3 assuming that some solid NH HS remains b j 2 5 0 080 0 052 0 0064

his problem requires values in your textbook s specific appendices which you can access through the OWLv2 MindTap Reader You should not use the OWLv2 References Tables to answer this question as the values w t match a AgSCN Ksp AgSCN 1 1 x 10 2 K sp bpbl Ksp PbI2 7 9 x 10 9 ap 0 45 a 0 3 K sp C La 103 3 Ksp La 103 3 1 0 10 1 0 9 10 0 35 K sp Ag 0 25 ascN 0 35 d MgN H PO4

9 In a saturated solution of the sparingly soluble strong electrolyte AglO molecular mass 283 the equilibrium which sets in is Aglo s Ag aq 10 aq If the solubility product constant K of Aglo at a given temperature is 1 0x10 what is the mass of Aglo contained in 100 ml of its saturated solution 2 28 3 10 g 3 1 0x107 g 0 1 1 0 20 g State the monomer of Teflon 4 2 83 10 g

given 0 10 M solutions of the following acids which contains the highest concentration of H3O 1 HCO2H Ka 1 8 10 4 2 CH3CO2H Ka 1 8 10 5 3 HOCI Ka 4 0 10 8 4 HF Ka 6 3 10 4 5 HCN Ka 6 2 10 10

Q 2 The solubility of magnesium hydroxide can be described using the following equation Mg OH 2 s Mg2 aq 2OH aq What will happen to the equilibrium if H ions are added to the solution Max score 2 Neg score 0 5 equilibrium will move towards the reactants equilibrium will move towards the products No change will occur as magnesium hydroxide is solid No change will occur since protons are not part of the reaction

A strong acid B strong base C weak acid K 1 8 x 10 5 D a weak base K 2 10 and x O represents volume of that compound for the same concentration and area of overlapping represents extent of mixing The buffer is A B B

PCI PCI and Cl eqimolar mixture is at equilibrium at 6 atm pressure If an inert gas is introduced into the mixture with a mole fraction of 0 25 and the pressure is maintained at 6 atm only what is the degree of dissociation of PCI at new equilibrium 0 87 YOUR ANSWER CORRECT ANSWER IS

Consider the following reaction C s O g CO g x KJ CO g O g CO g y KJ 2 Heat of formation of CO g Question Type Single Correct Type 1 2 3 KJ x y mol KJ x y mol KJ y x mol

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

8 A gas is heated in such a way that its pressure and volume both becomes double Then by decreasing temperature some of the molecules of air has been added in container to maintain the doubled volume and pressure Assuming of initial number of moles has been added in for the purpose The fraction by which the temperature must have been raised finally of initial absolute temperature 1 4 times 2 16 5 times 3 4 54times 4 1 5times

i 100 ml of 0 1 M HCI mixed with 50 ml of water ii 50 ml of 0 1 M H SO4 mixed with 50 ml of water iii 50 ml of 0 1 M H SO4 mixed with 100 ml of water iv 50 ml of 0 1 M HCI mixed with 50 ml of water A i and ii B i and iii C ii and iii

A Solution of weak acid HA was titrated with base NaOH The equivalent point was reached when 40ml of 0 1M NaOH has been added Now 20ml of 0 1M HCI were added to titrated Solution The pH was found to be 5 What will be the pH of the Solution obtained by mixing 20ml of 0 2M NaOH and 20ml 0 2M HA A 7 B 4 C 9

In an acid base titration 0 1 M HCI solution was added to the NaOH solution of unknown strength Which of the following correctly shows the change of pH of the titration mixture in this experiment 1 3 pH PH A 1 B V mL 2 V mL 2 4 pH Is V mL pH V ml

3 334 4 130 Consider the following reactions in which all the reactants and the products are in gaseous state 2PQP Q K 2 5 x 105 PQ 1 2R The value of K3 for the equilibrium 1 2P2 1 2Q2 1 2R PQR is 1 2 5 x 10 2 5 x 10 PQR K 5 x 10 3 5x 103 4 1 0 x 10 5

For the reaction PCIs g PC13 g Cl2 g The forward reaction at constant temperature is favoured by 1 Introducing an inert gas at constant volume 2 Introducing chlorine gas at constant volume 3 Introducing an inert gas at constant pressure None of those

15 Following radioactive disintegration follows first order kinetics MAMB a particles Starting with 1 mol of A in a 1L flask at 300 K pressure set up after two half lifes is approximately a 25 atm b 12 atm c 37 atm For the first order reaction T average life T half life d 40 atm TEOL

The conversion of ozone into oxygen is exothermic Under what conditions is ozone the most stable 203 g 30 g Question Type Single Correct Type 1 2 At high pressure and high temperature 3 At low pressure and low temperature 4 At high pressure and low temperature At low pressure and high temperature