Solutions Questions and Answers

A 6 solution of urea is isotonic with a 0 05 M solution of glucose b 6 solution of glucose c 25 solution of glucose d 1 M solution of glucose 2009

The freezing point depression constant for water is 1 86 C m If 5 00 g Na SO4 is dissolved in 45 0 g H O the freezing point is changed by 3 82 C Calculate the van t Hoff factor for Na SO4 a 2 63 c 0 381 b 3 11 d 2 05

The boiling point of 0 2 mol kg solution of X in water is greater than equimolal solution of Y in water Which one of the following statement is true in this case A B C D Molecular mass of X is less than the molecular mass of Y Y is undergoing while X undergoes no change X is undergoing dissociation in water dissociation in water while y undergoing no change Molecular mass of X is greater than the molecular mass of Y

At 48 C the vapour pressure of pure CS is 850 torr A solution of 2 0 g of sulphur in 100 g of CS has a vapour pressure 844 9 torr Determine the atomicity of sulphur molecule

The vapour pressure of a solvent decreases by 10 mm of Hg when a non volatile solute was added to the solvent The mole fraction of the solute in the solution is 0 2 What should be the mole fraction of the solvent if the decrease in vapour pressure is to be 20 mm of Hg 1 0 2 2 0 4 luni 4 0 8 3 0 6 sealurit

For the coagulation of 500 mL of arsenious sulphide sol 2 mL of 1 M NaCl is required What is the flocculation value of NaCl

The freezing point of a 4 aqueous solution of A is equal to the freezing point of 10 aqueoust solution of B If the molecular mass of A is 60 then the molecular mass of B will be

Depression on freezing point of 0 01 molal aqueous HCOOH solution is 0 02046 1 molal aqueous urea solution freezes at 1 86 C Assuming molality equal to molarity pH of HCOOH solution is

of 200 mL of 1 M KOH is added to 200 mL of 1 M HCl and the mixture is well shaken This rise in temperature T is noted The experiment is repeated by using 100 mL of each solution and increase in temperature T is again noted Which of the following is correct diw sao s a T T ogmat cab driw 292651n d 2 b T is twice as large as T d belostieny amma 0 2 1 POOL 2 c T is twice as large as T betoibsn od tonnes b d T is four times as large as T of formation of Car On

The freezing point of a solution of acetic acid in benzene is 277 4 K Acetic acid partially dimeris Melting point of benzene is 278 4 K AusionH 10 042 kJ mole mass fraction of acetic acid in solution is 0 015 The initial moles of acetic acid in solution before dimerisation is x The degree of dissociation of dimerisation of CH3COOH in solution is y Then x y is

phase will be always rich in the component which is more vo The vopour pressure of pure benzene at a certain temperature is 0 850 bar A non volatile non electrolyte solid weighing 0 5g when added to 39 0 g of benzene molar mass 78g mol vapour pressure of the solution then is 0 845 bar what is the molar mass of the solid substance

20 gm of binary electrolyte mol wt 100 was dissolved in 500 gm water Freezing point of solution was found to be 0 74 C K 1 86 K molality What is the degree of dissociation of the electrolyte

glucose solu 2 If mole fraction of the solvent in solution decreas then 1 Vapour pressure of solution increases 2 B P decreases 3 Osmotic pressure increases 4 All are correct IS00

A solid substance A is soluble in water to the extent of 10 mg mL of water at 250C and 100mg mL of water at 1000C You have a sample that contains 100 mg of A and 25 mg of an impurity B A and B have the same solubility behavior If one 10mL portion of water was used for the recrystallization what was the recovery of A A cannot be determined B 90 C 70 D 0

The mole fraction of ethanol in water is 0 08 Its molality is A 6 32 mol kg B 4 83 mol kg SR 0 08 2 B 4 83 mol kg A 6 32 mol kg C 3 82 mol kg 493 faft 2 C 3 82 mol kg D 2 84 mol kg D 2 84 mol kg

10 1 00 g of a non electrolyte solute dissolved in 50g of benzene lowered the freezng point of benzene by 0 40K The freezing point depression constant of benzene is 5 12K kg mol Find the molar mass of the solute

The standard additions method was used to determine nitrite in a soil sample A 1 00 mL portion of the sample was mixed with 24 00 mL of a colorimetric reagent and the nitrite was converted to a colored product that produced an absorbance of 0 300 To 50 mL of the original sample 1 00 mL of a standard 1 00 x 10 3 M nitrite solution was added The same color formation procedure was carried out and the absorbance obtained was 0 530 What was the nitrite concentration in the original undiluted sample

In a titration of Vinegar the average volume of 0 1 M NaOH used after three titrations is 4 26 mL If the density of vinegar acetic acid is 1 006 g ml and the molecular mass of CH3COOH is 60 05 g mol The mass percent m v of the vinegar is 1 5x10 5 2 5x10 4 3 0 5 4 5x10 3

On dissolving 0 6 g of urea molar mass 60 g mol and 1 8 g of glucose molar mass 180 g mol in 100 mL of water at 27 C The osmotic pressure of the solutionis R 0 08206 L atmk mol O O O 8 2 atm 2 46 atm 4 92 atm 1 64 atm

in the following diagram point X represents Vapour Pressure X A Boiling point of solution B Freezing point of solvent C Boiling point of solvent D Freezing point of solution 115 851 Temperature

A cylinder contains nitrogen gas and some liquid water at the temperature of 25 C The total pressure found in the cylinder is 600 mm The piston is moved into the cylinder till the volume is halved keeping the temperature constant If aqueous tension at 25 C is 23 8 mm Calculate the final total pressure in the cylinder

que ven below using the formula Po Ps Ps molality Molar mass of solvent 1 100 0 Calculate the mass of a non volatile solute molar mass 40 g mol which should be dissolved in 114g octane to reduce its vapour pressure to 80 b 20 g 10 g d 0 1 g a c 30 g

Forwarded What is the amount of phosphate buffer o pH 6 8 required to maintain the pH of the distilled water equals to its own pH when 100L of distilled water of pH 8 5 is present 10 46 pr

The vapor pressure of benzene is expressed by the following formula 3884 K In P torr 17 63 T Calculate the boiling temperature of benzene when the atmospheric pressure is 500 torr A 340 2 K B 34 2 K C 273 15 K D 278 15 K

72 The osmotic pressure of a solution of NaCl is 0 10 atm and that of a glucose solution is 0 20 atm The osmotic pressure of a solution formed by mixing 1 L of the sodium chloride solution with 2 L of the glucose solution is x x 10 3 atm z is nearest integer

This section consists of 24 multiple choice questions with overall choice to attempt any 20 questions In case more than desirable number of questions are attempted ONLY first 20 will be considered for evaluation 26 The vapour pressure of pure solvent A is 0 8 mm of Hg at a particular temperature On addition of a non volatile solute B the vapour pressure of solution becomes 0 6 mm of Hg What is the mole fraction of component B in the solution a 0 25 c 0 50 b 0 75 d 0 35 0 2 of

At a certain temperature the vapor pressure of pure thiophene C4H4S is measured to be 207 mmHg Suppose a solution is prepared by mixing 102 g of thiophene and 74 1 g of benzene C6H6 Calculate the partial pressure of thiophene vapor above this solution Round your answer to 3 significant digits Note for advanced students you may assume the solution is ideal

A solution of 120 g acetic acid M W 60 in 2 kg water has the depression of reezing point equal to ATf Molal depression constant of water is Kf Ionisation constant of acetic acid is Assume molarity to be equal to molality AT K k 2 A C AT K k k kw AT K B D 2 kw k AT K Kw

At 25 C the osmotic pressure of a blood sample due to presence of various solutes in it is 7 65 atm Assuming that molarity equals molality calculate the freezing point of the blood sample K 1 86 K kg mol and R 0 0821 litre atm K mol LO 5

Select the correct statement s based on following graph at constant pressure for an ideal liquid binary solution B is more volatile than A 100 A Gas Pure A can be obtained in final distillate liquid Composition 100 B Vapour pressure of solution will be 160 mm Hg if it contain 20 A by moles PO 200 mm Hg P 150 mm Hg A Boiling point of the mixture is always in between boiling points of pure A pure B

a Determine the normal boiling point of benzene C6H6 given that its vapour pressure is 20 0 kPa at 35 C and 50 0 kPa at 58 8 C b When 12 2 g nonvolatile compound is dissolved in 54 g of benzene at 58 8 0 C the vapor pressure fell to 45 kPa Calculate the molar mass of the compound pression

Phenol associates in benzene to a certain extent to form dimer A solution con taining 2 0 x 10 2 kg of phenol in 1 0 kg of benzene has its freezing point decreased by 0 69 K The degree of association of phenol is K for benzene 5 12 K kg mol

Calcium lactate is a salt of a weak organic acid and represented as Ca Lac A saturated solution of Ca Lac contains 0 13 mol of this salt in 0 50 litre solution The pOH of this solution is 5 60 Assuming a complete dissociation of the salt calculate K of lactic acid

1 kg of aqueous sugar solution is made by dissolving 200 g sugar in water This solution is then divided into two parts A and B in the ratio of 2 3 respectively If 20 water is evaporated from both A and B parts of the solution then choose the correct option s A Concentration of solution B 17 B C Concentration of solution A B Concentration of solution A 25

There are two aqueous HCI solutions kept in different vessel How much solution 2 should be added to solution I in order to make 2 5 M HCI solution 100 ml 200 ml 500 ml E2M 500 ml3 2 litre 5M 5 litre

Example 2 4 Two solutions of ethanol marked as Xand Y have been labbled as 25 ethanol by mass and 25 ethanol by volume respectively If density of ethanol is 0 789 g mL 1 and that of solution X is 0 968 g mL then point out which solution has higher molarity

12 1 kg of aqueous sugar solution is made by dissolving 200 g sugar in water This solution is then divided into parts A and B in the ratio of 2 3 respectively If 20 water is evaporated from both A and B parts of the solution then choose the correct option s One More Correct Answer s A Concentration of solution B 17 B 0 D Concentration of solution AB Concentration of solution A 25 Concentration of both the solutions become equal

Example 2 3 Calculate the resulting molarity of the solution that is obtained by adding 5 g of NaOH to 200 cm of M 4 NaOH solution density 1 05 g cm 3 The density of resulting solution is 1 08 g cm

8 g of helium and 4 g of hydrogen gas are present in a closed vessel at 127 C If pressure exerted by the gas mixture is 4 1 atm then the volume of the container is NCERT Pg 145 1 32 L 3 40 L 2 16 L 4 24 L

The solubility of a specific non volatile salt is 4 g in 100g of water at 25 C If 2 0 g8 4 0 6 0 g of the salt g and added of 100 g of water at 25 C in system X Y and 2 The vapour pressure would be in the order A X Y Z C Z X Y B X Y Z D X Y Z

Trial a b C Vol of HCI mL Initial mass g 3 00 3 00 3 00 99 43 99 54 99 48 Mass at endpoint g 104 12 104 23 104 16 NaOH was titrated with 0 1035 M HCI by a scientist The NaOH solution was used in the amount of 15 mL for all trials The scientist wants to know the average concentration and molarity of the NaOH solution across all trials

A patient received 6 0 gg of NaClNaCl in 8 hours You may want to reference Page Section 9 4 while completing this problem How many milliliters of a 0 60 m v NaCINaCl saline solution were delivered Express the volume in milliliters to two significant figures

NEED RIGHT ANSWER ONLY DO IF CONFIDENT YOU CAN GET IT A solution contains 1 08x102 M manganese II acetate and 6 47 10 3 M copper II nitrate Solid sodium sulfide is added slowly to this mixture A What is the formula of the substance that precipitates first formula B What is the concentration of sulfide ion when this precipitation first begins S M

Two liquids Afp 100mm and B P 200 mm are mixed together in a molar ratio of 2 1 and kept in a cylinder with a piston at such pressure that no vapour is formed initially the piston in now withdrawn slowly while keeping the temperature constant What is the pressure when 1 4 the moles of liquid have vaporized in mm

How many phases are there in NaCl solutio n I know as per the definition of homogene ous mixtures it would have single phase but sir if we change our perspective and observ e it microscopically then I think it would hav e 2 phases as the salt is solid and water is li quid and both have their own properties the n why we call it single phase So by this way I think there is no such thing as homogeneo us mixture if we talk about it on the basis of Phase because any mixture would surely ha ve atleast 2 phases so sir kindly clarify my c onfusion

Pls give detailed solution A 0 5 dm flask contains gas A and 2 dm3 flask contains gas B at the same temperature If density of A 4 g dm that of B 2 g dm and molar mass of A is half of that of B then the ratio of pressure exerted by gas is PA Pa PA 2 Pa P 0 5 11 4

Q33 Assume three samples of juices A B and C have glucose as the only sugar present in them The concentration of sample A B and C are 0 1 M 0 5 M and 0 2 M respectively Freezing point will be highest for the fruit juice have same freezing point a A b B c C d all Q41 Molecule following r a 2 Brom Q42 A compou

Which of the following statements are correct I Apure substance has fixed melting and boiling points II If a liquid is impure it will boil over a range of temperatures but will freeze at a fixed temperature III If the pressure acting on a liquid is increased the boiling point will increase IV A pure orange juice will have a fixed boiling point A I and III only B I and II only C III and IV only D I II and IV only

A 30 L container is found to have 20 L acetone 1 at 780 mm of Hg pressure If 2 L of liquid acetone is taken out then calculate the total gaseous pressure approx inside the container Vapour pressure of acetone at given condition is 400 mm of Hg

The concentration in the chemical solution mixing problems at anytime t is equal to O the concentration of both the incoming and outgoing solutions O the concentration of the outgoing solution O the concentration of the incoming solution none of the choices