Solutions Questions and Answers

250 mL of hard water having hardness due to Caso is passed through anion exchange re in R OH 2 and water coming out of resin required 20 mL of 0 001 M H2SO4 for its titration Thus hardness of water in ppm of CaSO4 is of Caso 136 g

9 How many number of molecules and atoms respectively are present in 2 8 litres of a diatomic gas at STP b a 6 023 x 10 75 x 10 6 023 x 10 15 x 1022 c 7 5 x 102 15 x 10 2 d 15 x 102 7 5 x 10 a b c d H 59 H

3 PbO is added to an acidified solution of KMnO4 4 Na O is added to boiling water At certain Hill station pure water boils at 99 72 C If K for water is 0 513 Ckgmol The boilin point of 0 69 m solution of urea will be 1 100 074 C 2 103 C 3 100 359 C 4 Un predictabl

Mark Tor Review Which of the following helps in flocculation of lyophobic colloids By adding opposite charge electrolyte Electrophoresis 01 2 hr Continuous dialysis All of these

3 w v aqueous solution of glucose would be isotonic with A 1 w v aqueous solution of urea B 1 w v aqueous solution of Benzoic acid 1 w v aqueous solution of CaCl D 1 w v aqueous solution of NaCl

Two liquids A and B are mixed at temperature T in a certain ratio to form an ideal solution It found that the partial pressure of A i e PA is equal to Ps the pressure of B for liquid mixture What is the total pressure of the liquid mixture in terms of P and P POP A AB P P 2P P P C B D 2P PR AB P P 2P B P P 4

A beam of light is passed through three containers containing three different mixtures The beam of light rays is not visible in the first container it is brightly visible in the second container and in t he third container faint beam of light is visible Identify the type of mixtures in the three container s Justify your answer with reason s

Total vapour pressure of mixture of 1 mole volatile component A PA 200 mm Hg and 3 mole of volatile component B P 160 mm of Hg is 180 mm of Hg such case There is positive deviation from Raoult s law O Force of attraction between A B is stronger than between A and A or B and B There is negative deviation from Raoult s law Enthalpy of mixing of these two liquids A B is negative

If the solution of CuSO4 in which copper rod is immersed is diluted to 10 times the reduct electrode potential E 0 34 V get Cu 2 Cu A Increases by 0 03V C Increases by 0 059V B Decreases by 0 03V D Decreases by 0 059V

Relative lowering in vapour pressure RLVP of acetone solution containing Nal is 0 2 How much acetone is further needed to be added to the ame solution to make the RLVP to 0 1 Initial solution contains 10 mole acetone assume 100 ionization of Nal and PAcetone 200 Torr at 300 22 5 mole 12 5 mole 10 mole

One mole I solid is added in 1 M 1 litre Kl solution Then 1 Osmotic pressure of solution increases 2 Freezing point of solution increases 3 Relative lowering in vapour pressure decreases 4 No change in boiling point of solution

A binary solution of liquid A and B PA POXA PO PO s shows large positive deviation from Raoult s law then select the correct statement s relationship s AV x 0 Boiling point of the solution must be less than boiling of liquid B Boiling point of the solution must be less than boiling point of liquid A

R shown below The overall yield of the major product R from P is 90 What is the amount in grams of R obtained from 18 6mL of P Use density of P 1 00 g mL 1 Molar mass of C 12 0 H 1 0 0 16 0 and N 14 0 g mol 1 NH 44 45 46 46 ConH SO4 ConHNO3 1 Zn HCI Q minor 2 HNO R

Dinary mixture containing two volatile liquids A and B is in equilibrium with its vapours Identify the incorrect statement s Sum of number of moles of A and B in vapour state is equal to the sum of number of moles of A and B in liquid state lya and ye are mole fractions of A and B in the vapour phase respectively P and Pg are vapour pressures of pure liquid A and pure liquid B respectively Ye PP P OP Ye Vapour pressure of the given binary mixture in 1 L container is 100 mm Hg If volume of container increases to 2 L then vapour pressure will become 50 mmHg at the same temperature 18 12 55 A 17

KINDLY PROVIDE A HANDWRITTEN SOLU TION and also explain why water is taken a s solution here volume of solution is taken as 500mL 31 5 g of HNO3 is added to 500 mL of wate r Then choose the correct option s A Strength of the solution is 31 5 g L 1 B Molarity 1 M C Molarity 1 5 M D Strength of the solution is 63 g L 1

70 An aqueous solution is 1 00 molal in KI Which change will cause the vapour pressure of the solution to increase ps pixsh 1 addition of NaCl 2 addition of Na SO4 3 addition of 1 00 molal KI 4 addition of water

What quantity in mL of a 45 acid solution of a mono protic strong acid must be mixed with a 20 solution of the same acid to produce 800 mL of a 29 875 acid solution Main Online April 9 2017 c 316 d 330 a 320 b 325

8 Calculate the mole fraction of toluene in phase which is in equilibrium with a solution o benzene and toluene having a mole fraction o toluene 0 5 The vapour pressure of pure Benzene is 119 torr and that of toluene is 37 torr at the same temperature 1 0 5 2 0 75 3 0 625

Calculate the molarity of a solution prepared by dissolving 12 50 grams of NaNO3 in 250 mL of solution The molar mass of NaNO3 is 85 00 g mol Write your answer with the correct units on the blank below

3 At room temperature a dilute solution of urea is prepared by dissolving 0 60 g of urea in 360 g of water If the vapour is 35 mm Hg pressure of pure water at this temperature lowering of vapour pressure will be Molar mass of urea 60 g mol 2019 Main 10 April I

Among 0 1 M solution of urea and Na3PO4 and aluminium sulphate the vapour pressure and freezing point are the highest for urea B the vapour pressure and freezing point are the lowest for urea the elevation in boiling point is the highest for Al2 SO4 3 Dthe depression in freezing point is the highest for Al SO

c 1500 3 3 An ideal solution was obtained by mixing methanol and ethanol If the partial vapour pressure of methanol and ethanol are 2 619 kPa and 4 556 kPa respectively the composition of vapour in terms of mole fraction will be a 0 635 MeOH 0 365 EtOH b 0 365 MeOH 0 635 EtOH c 0 574 MeOH 0 326 EtOH H0827 EtOH

If Ksp of the salt A3B is 2 7 x 10 11 then solubility of the salt in mol L will be 2 7 x 10 3 M 2 7 x 10 4 M 10 3 M 10 4 M

The osmotic pressure of 0 5 M aqueous solution of cane sugar at 300 K is R 0 0821 L atm K mol 0 123 atm 6 12 atm 1 23 atm hr m 12 3 atm

9 A mixture of toluene and benzene boils at 100 C Assuming ideal behaviour the mole fraction of toluene in the mixture is closest to Vapour pressures of pure toluene and pure benzene at 100 C are 0 742 and 1 800 bar respectively 1 atm 1 013 bar a 0 824 c 0 544 b 0 744 d 0 624

Which of the following is an example of positively charged colloidal solution M 1 100ml AgNO3 100ml KI 10 M 10 M 20 M 2 100ml 10 AgNO3 100ml KI M M 3 100ml AgNO3 100ml KI 20 10 4 100ml AgNO3 100ml M KI

Degree of dissociation of three binary electrolytes AB CD and EF are 60 20 and 100 in the solution having same mole fraction of water Ratio of lowering in vapour pressure of their solution is 1 0 8 0 6 1 3 0 3 0 5 0 2 2 0 2 0 4 0 1 4 1 2 0 5

1 Mn O 14 2 MhO 3 MnO 4 An aqueous solution of 6 3 g of oxalic acid dihydrate is made upto 250 ml The volume of 0 1 N NaOH required completely neutralise 10 mL of this solution is 1 40 ml 2 20 mL HO 18 3 10 mL 4 4 mL water oxygen radioactivity will be shown by which of the product

If x molar 400 ml oxalic acid solution completely oxidised with 160 ml 0 05 molar acidified KMnO4 solution Then what will be the pH of initial oxalic acid solution if it dissociate completely

CHEMISTRY The molarity of HNO in a sample which has a density 1 4g mL and mass percentage of 63 is Molecular Weight of HNO3 63 4 28 M 1 7M 2 14 M 3 2 1 M The de Broglie wavelength of an electron in the 3rd Bohr orbit is

The osmotic pressure of 0 1 M monobasic acid of pH 3 at 27 C is 27 C 0 1 M pH 3 o 45 Jos Options 1 2 42 atm 2 42 242 4 atm 242 4 J 60 6 atm 60 6 50 9 atm 50 9

Two sample of HI each of 5 g were taken separately into vessels of volume 5 and 10 litr respectively at 27 C The extent of dissociation of HI will be 1 More in 5 litre vessel 2 More in 10 litre vessel 3 Equal in both vessel 4 None of these Ans 3 10

A 250 mm B 140 mm C 26 4 Given at 350 K PA 300 torr and PB 800 torr the composition of the mixture having a normal boiling point of 350 K is A XA 0 08 B XA 0 06 C XA 0 04 D XA 0 02 Two liquids A and B have P A and P B in the ratio of 1 3 and the ratio of number of moles of A and B in se in equilibrium with the solution is equal

The following solution solvent has maximum vapour pressure a IM copper sulphate solution c 0 5M copper sulphate solution b page33 pure solvent water 2M copper sulphate solution d ure of solution containing dissolved no

52 0 1 M NaCl and 0 05 M BaCl solutions are separated by a semi permeable membrane in container For this system choose the correct answer 1 Water flows form BaCl soltion towards NaCl solution 2 There is no movement of any solution across the membrane 3 Osmotic pressure of 0 1 M NaCl is lower than the osmotic pressure of BaCl Assume complete dissociation 4 Water flows from NaCl solution towards BaCl solution

3 If 0 15 g of a solute dissolved in 15 g of solvent is boiled at a temperature higher by 0 216 C than tha of the pure solvent The molecular weight of the substance molal elevation constant for the solvent is 2 16 C is 1 100 2 80 3 10 4 1 001

1 g of non volatile solute AB2 is dissolved in 400 g of ethanol The depression in freezing point is found to be 0 5 C If molar mass of AB2 is 20 g mol If the degree of dissociation of AB2 is Kf of ethanol 2 K kg mol AB dissociate into A and B x The value of 10 x is

D Vapour pressure of a solution is 4 5 atm This solution has been separated from the solvent by semipermeable membrane If 5 2 atm external pressure is applied over the solution then 1 Osmosis will be stopped 2 Osmosis will be held in opposite direction 3 Solute molecules will start migrating 4 No effect on osmosis

LS0003 Liquids A and B form an ideal solution Calculate the mole fraction of A in the vapours above the liquid solution containing the liquids A and B in 2 3 mole ratio at equilibrium Given Po 0 4 atm P 0 8 atm

6 970 g of a non volatile solute is dissolved in 230 0 g of water The solute does not react with water nor dissociate in solution Assume that the resulting solution displays ideal Raoult s law behaviour At 60 C the vapour pressure of the solution is 147 48 torr The vapour pressure of pure water at 60 C is 149 40 torr Calculate the molar mass of the solute O121 g mol 30 g mol 42 g mol 78 g mol

For a solution if p 600 mm Hg p 840 mm Hg under atmospheric conditions and vapour pressure of solution is 1 atm then find X and XB i Composition of solution ii Composition of vapour in equilibrium with solution

73 Two solutions A and B each of 100 L was made by dissolving 4 g of NaOH and 9 8 g of H SO in wat respectively The pH of the resultant solution obtained from mixing 40 L of solution A and 10 L of solution B is 1 5 3 2 10 6 3 9 4 4 7 5 74 Which of the following complexe is used in cencer treatment

The vapour pressure of two pure liquids A and B that forms an ideal solution are 300 and 800 torr respectively at temperature T A mixture of the vapours of A and B for which the mole fraction of A is 0 25 is slowly compressed at temperature T The vapour pressure of this condensate on 100 condensation of vapour is measured to be P What is the value of 684 P

73 If 10 4dm 3 of water is introduced into a 1 0 dm flask at 300 K how many moles of water are in the vapour phase when equilibrium is established Given Vapour pressure of H O at 300 K is 3170 Pa R 8 314JK mol a 1 27x10 3 mol c 1 53x10 mol b 5 56 10 3 mol d 4 46x10 2 mol

2 marks A non ideal binary solution contains components A and B Explain in terms of molecular interactions when does this solution show this solution show i a positive deviation and ii a negative deviation from Raoult s law

30 It is more convenient to obtain the molecular weight of an unknown solute by measuring the freezing point depression than by measuring the boiling point elevation because 1 Freezing point depression is a colligative property whereas boiling point elevation is not 2 Freezing point depressions are larger than boiling point elevations for the same solution 3 Freezing point depressions are smaller than boiling point elevations for the same solution 4 Freezing point depression depends more on the amount of the solute than boiling point elevation TE 2 and 2 ba the throchold wavelength and wavelength of incident light the velocity of photoelectron 21

Q 7 For a Fajan s titration it was determined that a 15 mL solution of potassium chloride was 0 04 M in concentration The end point of the titration was observed at the burette reading of 16 3 mL What is the concentration of the standard silver solution used in this titration Max score 2 Neg score 0 5 0 1 M 0 04 M 0 037 M 0 0025 M

97 50 mL of 20 8 w V BaCl2 aq and 100 mL of 9 8 w V H SO4 aq solutions are mixed Molarity of Cl ions in the resulting solution is At mass of Ba 137 a 0 333 M b 0 666 M c 0 1 M 98 100 mL of 10 NaOH w is added to 100 ml of 10 IC an d 1 33 M m1

1 The Henry s law constant for the solubility of N 2 gas in water at 298 K is 1 0 x105 atm The mole fraction of N 2 in air is 0 8 The number of moles of N2 from air dissolved in 10 moles of water at 298 K and 5 atm pressure is a 4 0x10 4 c 5 0 10 4 b 4 0 10 5 d 4 0x10 6 idered to be completely

13 a 2g of benzoic acid dissolved in 25 g of benzene shows a depression in freezing point equals to 1 62K Molal depression constant of benzene is 4 9K Kgpermol What is percentage dissociation of molecule if it forms dimer b Explain reverse osmosis