Equilibrium Questions and Answers

Solution A consists of a 0 20 M aqueous solution of formic acid HCOOH at 25 C Calculate the pH of Solution A The pK of HCOOH is 3 75 Answer

4 A substance undergoes a series of chemical reaction as shown A C KD with rate constant K B In 2 2000 C 200 sec K A K 20 In 2 sec What will be the value of once steady state is obtained C represents concentration A 40000 B 20000 D 400 In 2 10 sec Page No

Oxidation Reduction Reactions 1 Label the following half reactions as either an oxidation or reduction reaction a Br2 2e 2Br b Na Na e c 2C1 Cl 2e d Cl 2e 2C1 e Nate Na g Fe Fe 2e Cu 2e Cu h Fe e Fe BSESS

Which will make acidic buffer 50 mL of 0 1 M HCI 50 mL of 0 1 M NH3 50 mL of 0 1 M CH3COOH 50 mL of 0 1 M KOH 100 mL of 0 1 M HCI 50 mL of 0 1 M NaCl 100 mL of 0 1 M CH3COOH 50 mL of 0 1 M KOH

In a buffer solution containing equal concentration of B and HB the K for Bis Then pH of the buffer solution is us apo grave pars made de Budu HB 50 J B 10 av po gw pH Jod Options 1 8 2 7 3 6

How much volume in ml of 0 2 M CH3COOH solution should be added in 500 ml of 0 1 M NaOH solution to make a buffer of pH of 5 0 pKa CH3COOH 4 7 1 500 ml 3 375 ml 2 200 ml 4 400 ml

1 Consider an aqueous solution 0 1 M each in HOCN HCOOH COOH and H PO for HOCN H in H IOCN HOCN we can write K HOCN this expression refers to A H ions released by HOCN B Sum of H ions released by all monoprotic acids C Sum of H ions released only the first dissociation of all the acids D Overall H ion concentration in the solution

pH of 0 2 M aqueous solution of sodium bel will be pKa of benzoic acid 4 2 1 9 50 28 75 3 10 25 4 7 50 2 Which among the following is smallest in size

Question 67 pH of 10 M aqueous solution of CH COOH is pK CH COOH 4 7 Options 1 4 2 85 3 7 4 7 Solution Answer 2

Which of the following solutions has the highest H ion concentration Only one correct answer A Aqueous solution of quick lime B Brine C D Vinegar Milk of magnesia suspension

140 For ortho phosphoric acid H PO4 aq H O aq H O aq H PO4 aq K H PO4 aq H O aq H O aq HPO2 aq K HPO2 aq H O aq H 0 aq 4 PO aq K a3 The correct order of K values is a1 A Ka K Ka B Ka K Ka 1

3 e g pH for 10 3 M HCI is 3 Note pH pOH pk i e pH pOH 14 at 298K 7 Example 6 Solution S K changes with temperature and accordingly the pH scale also changes Fre Alfu Peti f The concentration of H ion in a sample of soft drink is 3 8 x 10 pH log H log 3 8 x 10 30 58 2 42 J

Determine if the following salt is neutral acidic or basic If acidic or basic write the appropriate equilibrium equation for the acid or base that exists when the salt is dissolved in aqueous solution If neutral write only NR C H NH

ons A 20 litre container at 400 K contains CO g at pressure 0 4 atm and an excess of SrO neglect the volume of solid SrO The volume of the containers is now decreased by moving the movable piston fitted in the container The maximum volume of the container when pressure of CO attains its maximum value will be Given that SrCO3 s SrO s CO g K 1 6 atm 1 5 litre 3 4 litre 2 10 litre 4 2 litre Cu The solubility 1 6 x 10 10 in 6 NEET 2017 1 1 26 1 3 1 6x1 Boric acid 1 Con 2 Gi G 3 Ap 7 Whi like

ml of 39 0 01 M HA aq is 2 dissociated OH of solution is a 2x 10 4 b 10 8 c 5 x 10 11 d 5 10 2 40 If degree of dissociation is 0 01 of decimolar solution of weak acid HA then pK of acid is

The reaction A s 2B g is in equilibrium at 4 atm and 27 C If the volume of system is increased at constant temperature then at new equilibrium relative to initial equilibrium A Moles of A s decreases B Moles of B g increases C Molar concentration of A s decreases D Molar concentration of B g decreases

At 25 C in one saturated solution of silver oxalate K 1 6x10 0 1 moles of Na C O a added If 1 60 Scm mol 140Scm mol 2 1 2 Na 50Scm mol 1 then select correct co statement A B C Conductance of given solution is nearly 24x10 S Conductivity of given solution is nearly 24 10 Scm If cr is 50 Scm mol then 120Scm mol AgC1 Solubility of Ag C 0 in presence of Na C O is

38 A weak base MOH of 0 1 N concentration shows a pH value of 9 What is the percentage degree of dissociation of the acid b 0 001 a 0 01 c 0 1 d 0 02 39 0 01 M HA aq is 2 dissociated OH of solution is

Calculate the carbonate ion concentration CO3 2 in a 0 10 M solution of the weak acid carbonic acid H CO3 The dissociation constants of carbonic acid are Ka 4 5 x 10 7 and Ka 4 7 x 10 11 Question Type Single Correct Type 14 7 10 11 M 2 1 0 107 M 3 4 5 x 10 7 M

Calculate CH3COO concentration in aqueous solution of 0 01 M acetic acid containing 0 1 M HCI Given K for CH3COOH 1 8 x 10 1 O 1 8 x 10 5 mol L 1 O 1 8 x 10 6 mol L 1 O 3 6 x 10 3 mol L 1 O 5 4 x 10 5 mol L 1

15 A hand book states that the solubility of RNH g in water at 1 atm and 0 C is 22 41 volumes of RNH g per volume of water pK of RNH 4 Find the max pOH that can be attained by dissolving RNH in water a 1 b 2 c 4 d 6

ligh levels of ozone 03 make rubber deteriorate green plants turn brown and cause people to have ifficulty breathing Calculate AG at 298 K for the formation of 1 mole of Os from O in urban smog here 0 0 210 atm and 03 5 00 x 107 atm kJ mol

M a 40 If degree of dissociation is 0 01 of decimolar solution of weak acid HA then pK of acid is a 2 b 3 Jes 5 d 7 41 What concentration of HCOO is present in 1 8 x 107 a solution of 0 01 M HCOOH Ka

Calculate the enthalpy change on fusion of 1 mol of ice at 5 C to water at 5 C Given AH 6 03 kJ mol at 0 C Cp H O 0 75 3J mol K Cp H O s 36 8 Jmol K 1 6 59 kJ mol 6 59 kJ mol 3 ALLI 3 29 kl mol

37 A 0 10 M solution of HF is 8 0 dissociated What is the K a 6 4 x 10 4 b 8 8 x 10 4 c 6 95 x 10 d 7 6 x 10 38 A weak base MOH of 0 1 N concentration shows a pH value of 9 What is the p

61 The following equilibrium are given N 3H 2NH3 K N 0 K H 1 1 20 2 H O K The equilibrium constant of the reaction 2NO 3H O in terms 2NH3 5 2 0 of K K and K is K K A K 2NO B 2 K K K C K K3 K D K K K 1 1

a 2 30 b 1 50 11 70 29 At 90 C pure water has H 106 M If 100 mL of 0 2 M HCl is added to 200 mL of 0 1 M KOH at 90 C then pH of the resulting solution will be a 5 B 6 c 7 Ho d None of these for the following reaction if the hypochlorous acid solution is diluted will no

1 Consider the following reaction at 200 C 2CO g O g 2C0 g An equilibrium mixture contains 0 200 mol CO 1 30 mol O and 0 300 mol CO in a 500 ml reactor At a certain instant a valve is opened and 0 100 mol of CO is added to the reactor 1 1 Determine the value of Ke at 200 C

The value of K for self ionization of formic acid is 10 4 at room temperature What percentage of formic acid is converted to formate ion Given d coo 1 22 g cc A 0 004 B 0 0045 C 0 025 SD 0 037

162 The reaction 2A g B g 3C g D g is start with the concentrations of A and B both at an initial value of 1 00 M When equilibrium is reached the concentration of D is measured and found to be 0 25 M The value for the equilibrium constant for this reaction is given by the expression A 0 75 0 25 0 50 0 75 B 0 75 0 25 0 50 0 25 C 0 75 0 25 0 75 0 25 D 0 75 0 25 1 00 1 00

For the reaction H g 1 8 2HI g the standard free energy is AG 0 The equilibrium constant K would be a K 0 c K 1 b K 1 d K 1

When the following reaction come to equilibrium N g 2H g N H g K 7 4 1026 the equilibrium a Mostly products b Mostly reactants mixture contains c It can not be predicted d Some times reactants and sometimes products

The incorrect statement s about Haber s process is are 1 Actually process is performed at high temperature and pressure Il The yield will increase by increasing temperature III Both yield and rate will increase high temperatures IV Both yield and rate will decrease at high temperatures

If bond enthalpies of N N H H and N H bonds are x x2 and x3 respectively AH for NH3 will be Question Type Single Correct Type 1 2 3 A X1 3x2 6x3 1 2x1 3 2x2 3x3 3x3 1 2x13 2x2 6Y Y 3x0

If the value of an equilibrium constant for a particular reaction is 1 6 x 10 2 then at equilibrium the system will contain 2015 a Mostly reactants b Mostly products c Similar amounts of reactants and products d All reactants

The equilibrium constants of the following are N 3H 2NH K K N 0 2NO H 0 H O K The equilibrium constant K of the reaction 2NH 0 2NO 3H O will be a KK K c K K K b K K K d K K K 2017

10 4 6 10 23 a v 42 SO Cl 9 SO g Cl g K 2 9 10 atm atm SO Cl f 1 a 1 1 87 3 17 2 13 4 29 1 XX XV A cita 1 3 50 37 CO LAX

The solubility product of BaCl2 is 4 10 what will be solubility in mol litre Question Type Single Correct Type 1 2 3 4 4 x 10 3 3 2 10 9 1 x 10 3 1 10

Value of dissociation constant of acetic acid is 10 where as dissociation constant of formic acid is 10 Which of the following will be the value of pK acetic acid pK formic acid 1 10 2 1 3 10 4 1

a 10 b 10 5 35 What is the percent dissociation a of a 0 01 M HA solution K 104 c 10 d 10 0 a d 17 a 9 5 b 1 c 10 5 36 Given the two concentration of HCN K 10 are 0 1 M and 0 001 M respectiv

3 Acetic acid K 1 8 x 10 4 Benzoic acid K 6 5 10 The pH of 0 1 M monobasic acid is 4 50 The acidity constant of the monobasic acid is 1 1 0 x 10 7 2 1 0 x 10 3 1 0 104 4 1 0 10

c 5 4 x 10 5 4 x 10 23 pH of 10 6 M HCl aq is a just less than 6 c just greater than 6 Med d 8 1 x 10 3 8 1 x 107 3 b exactly equal to 6 d just less than 7 24 10 5 M NaOH solution at 25 C is diluted 1000 times The pH of the resultant solutio

Which of the following is the weakest acid 1 Phenol K 1 3x10 0 3 Acetic acid K 1 8 x 10 2 Hydrocyanic acid K 4 9x10 0 4 Benzoic acid K 6 5 x 10

x y S xy 3 K x y S 4 K x y S The molar solubility of silver sulphate is 1 5 x 102 mol L The solubility product of the salt will b 1 2 25 x 104 2 1 35 x 10 5 3 1 7 x 10 4 3 0 x 10

d we can not predict 31 Given K values of 5 76 x 10 10 and 4 8 x 10 10 for NH4 and HCN respectively What is the equilibrium constant for the following reaction NH aq CN aq 1 2 32 a 0 83 Which in th NH3 aq HCN aq c 8 0 x 10 11 27 6 x 10 10

For a chemical reaction A product the mechanism of the reaction postulated was as follows A 8 k g 3B k2 are Elai a1 If the reaction occured with individual rate constants k k and k3 determine activation energy for the overall reaction if the activation energies associated with these rate constants 1 70 KJ k3 2 10 KJ R D S 3 310 KJ Cg 180 kJ mol E2 90 kJ

a 3 11 c 12 d 13 28 What is the pH of a solution in which 10 0 mL of 0 010 M Sr OH is added to 10 0 mL of 0 010 M HCl a 2 30 b 1 50 11 70 d 7 00 29 At 90 C pure water has H 106 M If 100 mL of 0 2 M HCl is added to 200 ml of 01

For the reaction equilibrium mixture contained 3 moles each of PC15 PCl3 and Cl If the total pressure is 3 atm What is the value of Kp decomposition of gaseous PC15 A 1 B 3 C 4 D 6 for the

126 Which of the following is most soluble in water a Ba3 PO4 2 Kp 6 10 3 c Fe OH 3 Kp 6 x 10 38 b ZnS Kp 7x10 16 sp d Ag 3 PO4 Ksp 1 8 x 10 18 127 Silver ions are added to a solution with Br 1 1 1 CO 1 JAS 0 1 01

is not 5 For which electrolyte the evaluation of A possible by extrapolation of A vs c curves to zero concentration a KCI c NaCl b NH4OH d K SO4 otus in which electrical energy is converted