Equilibrium Questions and Answers

The simultaneous solubility of AgCN Kp 2 5 x 10 16 and AgCl Kp 1 6 x 10 19 in 1 M NH aq are s and respectively Then Given K Ag NH3 2 107 A S B S C 27 mol L 10 4 1728 cr CN mol L 6 4 105 S D Separate values of s and s cannot be determined just their ratio 5625 T C

E A team of General Chemistry 1 learners are undergoing a science laboratory activity on chemical equilibrium How can they achieve equilibrium A When the nature of the reactants and products remains constant B When the concentration of the reactants and products remains constant C When the rate of product reformation is equal to the rate of reactant formation D When the rate of product formation is greater than the rate of reactant reformation

Anhydrous CaCl is often used as desiccant In the presence of excess CaCl the amount of water taken up is governed by Kp 6 4 x 108s for the following reaction at room temperature CaCl s 6H O g CaCl 6H O s Which of the following statements is correct about above reaction A At equilibrium addition of CaCl will shift reaction in forward direction B Vapour pressure of water at equilibrium in a closed vessel that contains CaCl s is 5 x 10 15 atm approximately C Vapour pressure of water at equilibrium in a closed vessel becomes half if volume of container is reduced to half at same temperature D If temperature is increased then vapour pressure of water at equilibrium in closed vessel decreases

4 8 x 1045 1 1 43 35 X103 3 5 x 10 45 1 4 8 x 10 5 1 2 30 2 log log A 29 64 The degree of dissociation a of PCI obeying the 64 3 PCI PCl3 Cl feu farien an af equilibrium PCI PCI3 Cl is related to the pressure at equlibrium by 1 a 1 a 1 1 Kp 0 B do 2 p 1 x P 1 2 x JP 1 3 x 1 1 2 a p 2 x 4 8 1 P 1 11 00 11 255 1 x P 3 0 1 A 35 X 10 2 3 X 2221 46

3 4 1 4 2 1 68 The gas phase reaction 2NO g exothemic reaction The decomposition of N O4 in equilibrium mixture can be increased by 1 Addition of an inert gas at constant pressure 2 Lowering the temperature 6 3 Increasing the pressure 4 Addition of an inert gas at constant volume 40 PA PB IXA 2 1 4 3 4 1 4 2 1 28 Dout MB N O4 g is an 68 NO g 4H he 2 3 Gld an act 4 FRO PINGO N 04 9 3047 27 0 fact I GI 41 FOR SRI vf 50 32 87 5

143 What is the concentration of Ba2 when BaF2 Ksp 1 0 x 10 6 begins to precipitate from solution that is 0 30 M F a 9 0 10 7 b 3 3 x 10 5 c 1 1x10 5 144 Solubility of AgCl in 0 2 M NaCl is x and that in 01 MANO is y then which of the followi d 3 0 10 7

4 All of these Consider the following equilibrium in a closed container N O g 2NO g At a fixed temp the volume of the reaction container is halved for this change which of the following statements held true regarding the equilibrium constant K and degree of dissociation a 1 Neither K nor a changes 2 Both K and a changes 3 K changes but a does not change 4 K does not change but a changes For an equilibrium H O s H O which of

A solution is 0 30M in Ag and 0 050M in Ba2 If solid Na SO4 is added which will precipitate first Ag2SO4 Ksp 1 2 x 10 5 or BaSO4 Ksp 1 5 x 10 ii specify the concentration of SO4 2 needed to begin precipitation Question e options Ag2SO4 neither will precipitate as sodium salts are soluble BaSO4 both will precipitate simultaneously please help answer all parts please will rate good

Excess of Kl and dil H SO4 were mixed in 50 ml o H O The 1 liberated requires 20 ml of 0 1 N Naz S 0 The strength of H O is 1 0 68 g liter 2 0 58 g liter 3 48 g liter 4 38 g liter

3 5 0 10 15 4 0 2 10 17 Solubility product of silver bromide is 5 0 10 3 The quantity of potassium bromide molar mass taken as 120 g mol to be added to 1 L of 0 05 M solution of silver nitrate to start the precipitation of AgBr is 1 1 2 x 10 10 g 3 6 2 10 5 g 2 1 2 10 g 4 5 0 10 8 g

tion 24 4 Unilayer adsorption So 70 N 0 decomposes to NO and O and follows first order 0 N O NO kinetics After 50 minutes the pressure inside the vessel increases from 50 mm Hg to 87 5 mm Hg The pressure of the gaseous mixture after 100 minute at constant temperature will be 1 136 25 mm Hg 2 106 25 mm Hg Ae K 3 175 0 mm Hg 4 116 25 mm Hg 1 45 x A compound A CH on hydrolysis gives CH O which z CH 89 RT 3 fe 4 rata suferitor GRAT 150 HERO 87 5 mm Hg a 100 2 3x8 X13 3 25 290 few data for a 374 TO ERM 50 mm Hg 1 136 25 mm Hg Noos 2 N03 2 106 25 mm Hg P 435 SO 3 175 0 mm Hg 4 16 25 mm Hg 72 5 87 24 2 P 21 SP n 30 Cap o ligir

a x y b x y c x y d We cannot predict 145 What is the molarity of Fe CN in a saturated solution of Ag4 Fe CN 6 K 1 6 x 10 41 a 1 6 x 10 8 b 5 2 10 8 c 2 0 10 8 d 2 3 10 9 4 5 T

1 P 3 12 12 2 p 11 25 MaxP 3 x p NH3 g NH3 g H S g observed pressure 65 NH4HS s 2 x 1 P 4 x 1 p4 65 For NH HS for reaction mixture at equilibrium is 1 12 atm at 106 C the value of K for the reaction is 1 3 316 atm 2 0 3136 atm 3 31 36 atm 4 6 98 atm The size of particles in suspension true solution and colloidal 2500 76560 308 2pop JP 1 21 48 1 4 2 4 1 3 316 atm 20 3136 atm 3 31 36 atm 4 6 98 atm 2 x NH3 9 1 12 atm 1106 C 8 7 5 815 3 24 27 2 75 9 563 337 280X 393

b 10 c 2 10 d 2 x 10 142 What is the concentration of Pb 2 when PbSO4 K 1 8 x 10 8 begins to precipitate from a sp solution that is 0 0045 M in SO2 a 4 0 x 10 8 M 4 b 1 0 x 10 6 M 2 143 What is the con c 2 0 x 10 8 M d 4 0 x 10 6 M

6 The first and second dissociation constant of an acid H A are 1 0 x 10 5 and 5 0 x 10 10 respectively The overall dissociation constant of the acid will be 2 5 0 10 5 4 0 2 105 1 5 0 x 10 5 3 5 0 10 15

Consider the following equilibriu 2A g B g C g 3D g At the approach of equilibrium concentrations of A B and C are 0 5 M 3M and 1 5M respectively At the start of the reaction C was absent but D was present initial concentration of D 0 5 M Identify the correct statement A the concentration of D at equilibrium is 4 5 M B K 250 M C K A B C D at equilibrium D addition of helium at constant pressure to the equilibrium mixture would push equilibrium backward 25

CIO d H F 2 dissociation 9 From separate solutions of sodium salts NaW NaX NaY and NaZ have pH 7 0 9 0 10 0 and 11 0 respectively When each solution was 0 1 M the strongest acid is 2 HX 4 HZ 1 HW 3 HY

For a reaction activation energy is zero What is the value of rate constant at 300 K if K 1 x 10 6s at 280K R 8 314 JK 1 mol Question Type Single Correct Type 1 2x 10 6 1 2 4x10 6 S 1 3 1 106 S 1

7 The pH of a 0 01 M solution of a monobasic acid is four Which one of the following statements about the acid is incorrect 1 When a little NaOH is added it will form a buffer solution 2 It is a weak acid 3 Its sodium salt will be acidic 4 Its sodium salt will be basic

11 The pH of a buffer is 6 745 When 0 01 mole of NaOH added to 1 litre of it the pH changes to 6 832 Its buff capacity is 1 0 187 3 0 076 2 0 115 4 0 896

3 13 When 10 ml of 0 1 M acetic acid pK 5 0 is titrated against 10 ml of 0 1 M ammonia solution pK 5 0 the equivalence point occurs at pH 1 5 0 3 7 0 2 6 0 4 9 0

If the amount of 9 0 x 10 3 M Pb2 ions is present in each of the following buffer solutions which of the buffer solutions given below will form Pb OH 2 precipitate Ksp Pb OH 2 1 2 x 10 15 one or more than one answers a buffer with pH 9 00 b buffer with pH 8 00 c buffer with pH 7 00 a only b only c only a and b b and c a and c W a b and c None of the three buffers form precipitate after Pb2 ions are added

6 Determine the H O partial pressure at 1000 K when 10 mole of H gas is exposed to the air AG using standard free energy change for the reaction H2 g 1 2O2 g H2O g which is AGO 246 55 T 103 in kJ mole

12 Calculate the amount of NH4 2SO4 in grams which must be added to 500 ml of 0 2 M NH3 to yield a solution of pH 9 K for NH 2 10 5 1 3 248 g 3 1 320 g 2 4 248 g 4 6 248 g

0 The degree of dissociation of water at 25 C is 1 9 107 and density is 1 0 g cm The ionic constant for water is 1 1 0 x 10 10 3 1 0 10 16 2 1 0 10 4 4 1 0 10 8

5 When glycinium hydrochloride NH CH COOH HCI is titrated against NaOH pH at the first half equivalence point is 2 40 and the pH at second half equivalence point is 9 60 The pH at first equivalence point is a 2 40 c 6 00 b 9 60 d 7 20

Gurukripa CAREER INSTITUTE 73 For the process H O 1 1 bar 373 K H O g 73 HH O 1 bar 373 K H O g 1 bar 373 K 1 bar 373 K the correct set of thermodynamic parameters is 1 AG ve AS 0 2 AG 0 AS ve 3 AG 0 AS ve 4 AG ve AS 0 4 An anion X has 31 nucleons and has atomic number equal 74 in it is 1 AG ve AS 0 2 AG 0 AS ve 3 AG 0 AS ve 4 AG ve AS 0 X 331 THYHE and de

71 180 Mark for Review In the reaction 2 C2H6 g 7 O2 g 4 CO2 g 6 H2O I When 1 mole of C H6 and 5 mole of O are made to read completion 3 mole of CO2 will be produced 4 mole of H O will be produced 2 mole of O2 will be consumed All the ethane will be consumed

1 Specific conductance of saturated solution of AgCl is 2 68x104 Sm and that of water is 0 86 10 Sm at 298 K Calculate the solubility product in mol dm unit if m for HNO3 AgNO3 and HCI are 421 104 Sm mol 133x10 4 Sm mol 426x104 Sm mol respectively A 1 74x10 10 C 1 32 10 B 1 32x10 5 D 1 74x104

When an electrolyte associates in solution then van t Hof factor i is Greater than one Less than one Equal to one hr m Zero

40 For an elementary reaction 2A g B g 2C g If initial pressure of A g is 20 torr and after 20 seconds total pressure becomes 25 torn point how long would it take total pressure to increase to 27 5 torr A 40 s B 60 s C 30 s istroud mistry Exe

U14 L3 Kc for the following reaction is 0 15 2SO3 g 2SO2 g O2 g Where SO2 0 76 M 02 0 29 M and SO3 1 9 M Find Q and predict how the reaction will proceed Q 0 05 the reaction will move to the right Q 0 15 the reaction is at equilibrium Q 23 the reaction will move to the left Q 0 044 the reaction will move to the right Q 0 044 the reaction will move to the left

View In English What is the concentration of Ba CN 2 in the aqueous solution of the mixture of Ba CN 2 and 0 1 M HCN having pH 5 Given pkb for CN at 25 C is E 1 3 4 Correct Answer 4 Four Answer 1 10 2 M 102 M 2x 10 2 M 5x10 3 M

5 For the chemical reaction XY the standard reaction Gibbs energy depends on temperature T in K as A G in kJ mol 120 3 8 The major component of the reaction mixture at Tis a Yif T 280 K b Xif T 350 K c Xif T 315 K d Yif T 300 K JEE Main 2019 11 Jan Shift 1

At 300K the reactions having following values of thermodynamic parameters which occur spontaneously a AG 400kJ mol 1 b AH 200 kJ mol 1 AS 4 JK 1 mol 1 c AH 200 J mol 1 AS 4 JK 1 mol 1 d AH 200 kJ mol 1 AS 40 JK 1 mol 1 A B a c d a b c

What should be the value of Kc for the reaction 2SO2 g O g 2SO3 g If the amounts are SO3 48 g SO 12 8 g and O 9 6 g at equilibrium and the volume of the container is one litre Question Type Single Correct Type 1 2 3 64 30 42

Among the following process ASsys is positive for Freezing of water Stretching of rubber band Condensation of vapours Diffusion of gases E

Two moles of N O4 is heated to form NO and 0 As soon as NO and O are formed they react to form N205 Two equilibria N O4 2NO 0 2NO 20 N O5 Are simultaneously established At equilibrium the degree of dissociation of N O4 was found to 50 Which of the following is correct at equilibrium 1 NO 0 2 2 N O4 NO 0 N 05 2 3 NO 0 N2O4 N O5 4 N O5 O2 NO 2 2

For the reversible PC13 Cl2 system PC15 the relationship between degree of dissociation a of PCI5 and the equilibrium constant Kp of the above equilibrium is 1 2 3 4 Kp P Kp Kp 1 P Kp 1 P Kp 1 V 1 P Kp

If Ksp of a weak salt AB is 10 14 M then the solubility of sa in mol L is 1 10 1 10 7 10 10 hr min 10 14

pka PK a2 2 and c pKa 113 In which of the following cases is the solution of AgCl unsaturated sp a Ag Cl Ksp b Ag Cl Ksp c Ag Cl Ksp d Ag Cl Kp d pK and pK a2 a 114 When equal volumes of the following solutions are mixed the precipitation of AgCl 10

5 The electronic configuration of some neutral atoms are given below 1 1s 2s 2 1s 2s 2p 3 1s 2s 2p4 In which of these electronic configuration would you expect to have highest i IE A 3 1 ii IE 2 1 C 3 2 Which of the following pairs has glomer D c f 4 1s 2s 2p 3s D 2 4

102 The pH of a solution containing 0 4 M HCO3 and 0 2 M CO is K H CO3 4 x 10 7 K HCO3 4 10 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 Na3PO

Ratio of equilibrium constants for the reaction CO 3 H CH4 H O Kc 10 and 1 1 CH 3 H O CO H is 1 101 3 104 3 103

For which of the following equilibrium reaction unit of Kc is L mol A g A g B g A g B g 2 B g A g B s C g C g D s

114 When equal volumes of the following solutions are mixed the precipitation of AgCl Ksp 1 8 x 10 10 will occur with a 10 M Ag and 10 M Cl c 10 5 M Ag and 10 6 M Cl al b 10 5 M Ag and 10 5 M CI d 10 0 M Ag and 10 10 M Cl

nsider the reaction A B at 1000 K At time t the temperature of the system was increased to 00 K and the system was allowed to reach equilibrium Throughout this experiment the partial essure of A was maintained at 1 bar Given below is the plot of the partial pressure of B with time hat 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 1 t time

litrous acid is a weak acid and ammonia is a weak base Based on this information what is the pH of ammonium nitrite elect the correct answer below Basic Acidic Neutral

109 An acid base indicator has KHIn 3 0 10 5 The acid form of the indicator is red and the basic form is blue The change in H required to change the indicator from 75 red to 75 blue is a 8 x 10 5 M b 9 10 5 M c 1x 10 5 M An acid base indicator which is a w 110 d 3 x 10 M

4 moles each of SO2 and O2 gases are allowed to react to form SO3 in a closed vessel At equilibrium 25 of O2 is used up The total number of moles of all the gases at equilibrium is 1 6 5 2 7 0 3 8 0 4 2 0