Solutions Questions and Answers

View In English The boiling point of an aqueous solution of a non volatilo solute is 100 15 C What is the froozing point of an aqueous solution obtained by diluting the above solution with an equal volume of water for water Kb 0 512 Kf 186 1 4 Correct Answer 3 Your Answer 1 Status incorrect 0 544 C 0 512 C 0 272 C 1 86 C Add to Bookmark List D

20 mL 5M NaNO2 solution is mixed with 100mL 2M HNO2 solution to prepare a buffer solution of pH 5 7 The K of HNO2 is 10 6 10 5 4 x 10 6 4 x 10 5 Marks 4 1

15 Given that the rms of a helium atom at a certain temperature is 1350 m s determine the rms of an oxygen molecule at this temperature Ans 477 36 m s 16 The volume 80 m cylinder contains oxygen gas at a temperature of 280 K and a pressure of 300 kPa Determine the a mass of oxygen in the cylinder b the number

The resistance of a cell is 250 ohm which is filled with 0 02 M Cal2 solution having cell constant 0 9 cm1 then calculate its molar conductivity B C D 90 S cm mol 1 180 S cm mol 1 30 S cm eq 120 S cm eq

3 2 10 atm 4 2 10 atm The volume strength is 11 2 V and density is 1 05 g mL 78 for 500 mL H O solution then what is the W W weight percentage of H O solution 1 6 69 2 6 48 3 3 35 4 3 24 If 25 ml of 0 25 M NaCl solution is diluted with 79 1 7 7 x 10 atm 3 2 10 atm 500 f H O 1 1 6 69 3 3 35 ufa 25 ml 2 0 25 2 7 7 x 10 atm 4 2 10 atm E A CIRCE HER 11 2 V H O facra ff 2 6 48 4 3 24

5 Lead II bromide is prepared using the following reaction Pb NO3 2 aq KNO3 aq unbalanced KBr aq 7 PbBr s How many milliliters of 1 25 M Lead II nitrate Pb NO3 2 are needed to prepare 150 grams of PbBr in excess potassium bromide solution Assume you have 100 yield a Fill in the stoichiometric flowchart below with the information from this problem

4 Fe H O C1 3H O If relative lowering in vapour pressure is 0 5 for 90 fenfu face award sufees 2447 aqueous solution of urea then 0 5 am 1 m 0 5 2 W W 30 39 3 Xolute 1 4 M 0 5 100 1 m 0 5 W 30 2 x 100 39 W 3 Xfrm 1 AY M E

1 A 25mL 0 05M HCL solution was mixed with 75 00mL 0 01M KOH solution 20mL of the resulting sol ution was titrated for neutralizatio n using a standard Ba OH 2 soluti on and its 25mL was required Th e polarity of Ba OH 2 solution is a 0 004M b 0 002M c 0 001M d 0 02M

At 75 C the vapor pressures of HNO3 and H O are respectively 4670 Pa and 11500 Pa on a nitric acid solution whose mass fraction in HNO3 is 0 650 Knowing that P HNO3 71990 Pa and P H O 38540 Pa Calculate the partial pressure Pi of each component for the ideal solution total pressure for the ideal and the real solution and the mole fractions of each component in the vapor x vapor for the ideal and actual solution

8 Following limiting molar conductivities are given x Scm mol 2 m H SO4 20 m K SO4 y Scm mol m CH COOK z Scm mol 2 in S cm mol for CH3COOH will be 1 x y 2z 2 x y z x y 3 X V Z 4

The vapour pressure of a solution containing 2 moles of a solute in 2 moles of water vapour pressure of pure water 24 mm Hg is a 24 mm Hg c 48 mm Hg b 32 mm Hg A 12 mm Hg iv

Mole fraction of a component A in vapour phase is X and the mole fraction of component A in liquid mixture is X2 then P P are vapour pressure of pure A B The tota vapour pressure of liquid mixture is a D 0

The vapour pressure of solution at give n temperature contain 72 gram of solut e in thousand gram of water is 600 4 5 Newton per metre square while that of pure water is 614 point 8 Newton per m etre square at the same temperature ca Iculate the molar weight of solute

21 Which has maximum potential for the half cell reaction 2H 2e H 1 1 0 M HCI 3 Pure water 2 Consider the following 2 A solution having pH 4 4 1 0 M NaOH

6 00 g of NaOH are dissolved in water to make 5 00 L of solution What is the concentration of hydronium ions H O in this solution Express your answer with the appropriate units View Available Hint s H O A Value Units

2 5 mole of KCl is added to one Kg of water at 1 atm At what temperature in kelvin unit will the water boil of the degree of dissociation of KCl is 0 8 Kb of H O 0 52 K kg mol Give answer in nearest integer value

Physics The vapour pressure of a solution having solid as solute and liquid as solvent is Options Directly proportional to mole fraction of the solvent Question Palette inversely proportional to mole fraction of the solvent Directly proportional to mole fraction of the solute Inversely proportional to mole fraction of the

Amount of ice that will separate out on cooling a solution containing 31 g ethylene glycol in 200 gm water to 9 3 C will be Kf water 1 86 K kg mol O 90 g O 100 g hr m O 110 g

Select an incorrect statement among the following O Solubility depends on the nature of solute and solvent O Solubility of a gases in liquid increases with decrease of temperature O Aquatic species are more comfortable in warm waters than in cold waters O Higher the value of KH the lower is the solubility of the gas in the liquid

mm 4 At 25 C a 0 1 molal solution of CH COOH is 1 35 dissociated in an aqueous solution Calculate freezing point and osmotic pressure of the solution assuming molality and molarity to be identical 0 189 C 2 48 atm

The solution prepared by dissolving 6 06 g of triphenyl methane C6H5 CH in 1000 g of benzene which has a cryoscopic constant of 5 12 Kkg mol is cooled at 0 221 C below the freezing point of pure benzene a Mass of crystallized benzene b Molality of the solution in equilibrium with the crystals

For a cell to work spontaneously which of the following option should be correct AG 0 Ecell 0 AG 0 Ecell 0 AG 0 Ecell 0 AG 0 Ecell 0

If the freezing point of a 0 01 molal aqueous solution of a cobalt III chloride ammonia complex which behaves as a strong electrolyte is 0 0558 C the number of chloride s in the coordination sphere of the complex is Kf of water 1 86 K kg mol Answer 0 01 02 03 04 05 06 07 08 09 0 01 02 03 04 05 06 07

An elevation of 0 70K was observed in a solution containing 12 5 g of non electrolyte substance in 175 g of water Calculate the molar mass of the substance Molal elevation constant Kb for water is 0 52 K kg mol 1 53 2 65 3 84 4 79 85 12 5 9412 Kb 1 5 2 E 3 4 7

Which of the following aqueous solutions shows maximum electrical conductivity 0 2 M HCN 0 2 M CH3COOH 0 2 M H CO3 hr min 0 2 M H SO4

2 An aqueous solution of a certain organic compound has a density of 1 063 gmL an osmotic pressure of 12 16 atm at 25 C and a freezing point of 1 03 C What is the molar mass of the compound 334 g mol

Vapour pressure of binary solution of two miscible 1 and volatile liquids when half of the liquid solution goes into vapour phase 2 Vapour pressure of two binary miscible and 2 volatile liquids R Vapour pressure of binary solution of two 3 immiscible and volatile liquids 5 Vapour pressure of binary solution having non 4 volatile solute P P P Po Po pop Po Pg XA Pg A B B V List II A B XB

4 a What is the molarity of a solution prepared by dissolving 10 00 g of NH4 3PO4 in water to make 1 25 L of solution PDy TAY 10 00 NPD 10 0 671 m 149 NH I 0 71 mol Nhu Du NH 1 200 M 140g mol Volume 1 254 Mass 10 00g NH ePO4 0 58688M b What is the molarity of the ammonium ions in the solution described in part a

Consider Henry s Law constant for some gases in water Gas Temperature KKH Kbar Ar 298 CO 298 IHCHO 298 CH4 298 40 3 1 67 1 83 x 10 5 0 413 Arrange these gases in increasing order of solubility in water CO Ar HCHO CH4 Ar CO HCHO CH4 CO Ar CH4 HCHO Ar CO CH4 HCHO

Consider a ternary mixture in which 10 g acetic acid MW 60 and 18 g glucose MW 180 is dissolved in 90 g of water What is the mole fraction of acetic acid in mixture 6 155 5 158 4 155 9 160

2 A sample of gas has a pressure of 0 27 atm and 54 3 mL The container is then compressed at constant temperature until the volume is reduced to 12 6 mL WHAT is the new pressure of the gas in the container

2 If the concentration of the herbicide atrazine commonly used in corn production in a water sample is 0 140 mg L how many parts per billion by volume are present 3 The current EPA maximum contaminant level of herbicide atrazine is 3 0 ppb by mass What is the maximum mass of atrazine allowed by the EPA per 1 0 kg of drinking water 4 The regulatory limit set by the EPA for the lead contaminant level is 15 parts per billion by mass What is the maximum mass in grams of lead in 2 0 gallon of drinking water that still satisfies the EPA regulatory limit The density of drinking water is 0 997 g mL

v Cryoscopic constant depends on nature of solvent b nature of solute c nature of solution A number of solvent molecules

Identify the correct order of solubility in aqueous medium 1 ZnS Na S CuS Sol Answer 3 NEET 2013 2 Na S CuS ZnS 3 Na S ZnS CuS 4 CuS ZnS Na S

The vapour pressure of a solvent decreased by 10 mm of mercury 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 the vapour pressure is to be 20 mm of mercury 1998 a 0 8 c 0 4 b d 0 6 0 2

Pressure cooker reduces cooking time for food because a boiling point of water involved in cooking is increased b heat is more evenly distributed in the cooking space c the higher pressure inside the cooker crushes the food material vi d cooking involves chemical changes helped by a rise in temperatura ix TX Mx X RHI

nish the table below which is Table 1 in your procedure to find the concentration of Fe ndard in solutions A F after the dilutions Standard Blank A B C D E F Fe standard soln 0 00ml 0 00ml 0 50ml 1 00ml 2 00ml 5 00 ml 10 00ml Fe std 0 mg L

8 Fish generally needs O concentration in water at least 3 8 mg L for survival What partial pressure of O above the water is needed for the survival of fish Given the solubility of O in water at 0 C and 1 atm partial pressure is 2 2 x 10 mol L 0 054 atm

vii A living cell contains a solution which is isotonic with 0 3 M sugar solution x 05 What osmotic pressure develops when 20 the cell is placed in 0 1 M KCl solution at body temperature al a 5 08 atm b 2 54 atm d 2 46 atm viii The osmotic pressure of blood is 7 65 MRT olxo 082 4 92 atm

Ez explain all the options al solution to FeCl solution 18 Dimer of acetic acid in benzene is in equilibrium with acetic acid at a particular condition of temperature and pressure If half of the dimer molecules are hypothetically separated out then 1 Osmotic pressure of the solution reduces 2 Freezing point of the solution reduces 3 Boiling point of the solution reduces 4 Vapour pressure of the solution reduces All th

v The osmotic pressure of CaCl and urea solutions of the same concentration at the same temperature are respectively 0 605 atm and 0 245 atm Calculate van t Hoff factor for CaCl 2 469

yetha viii The osmotic pressure of blood is 7 65 atm at 310 K An aqueous solution of glucose isotonic with blood has the percentage by volume a 5 41 c 4 53 b 3 54 d 53 4

Q 55 Phenol associates in benzene to a certain extent to form a dimer A solution containing 20 x 103 kg of phenol in 1 0 kg of benzene has its freezing point depressed by 0 69 K The fraction of phenol that has dimerised is K for benzene 5 12 K kg mol

38 What is true for solutions showing negative deviation from ideal behavior 1 Point the vapour pressure of individual O components in solution is higher than pure components the vapoure pressure of individual component in solution is lower than pure component the boiling point of the azeotrope is lower than either of the individual component The vapour pressure of the less volatile component is higher than the more volatile component

Solid Hgl is gradually added to KI solution in Nessler s test Which of the following statements is wrong A B C D Freezing point increases and then becomes constant Freezing point decreases constantly Boiling point decreases and then becomes constant Vapour pressure increases to a constant value Correct Answer Your Answer

According to Henry s law the partial pressure of the gas in vapour phase p is proportional to the mole fraction of the gas x in the solution For different gases the correct statement about Henry s constant is Question Type Single Correct Type 1 2 3 4 Higher the value of KH at a given pressure higher is the solubility of the gas Higher the value of KH at a given pressure lower is the solubility of the gas KH is not a function of nature of gas KH value for all gases is same at a given pressure

36 If 0 25 molar aqueous solution of Na2SO4 is isotonic with 7 5 w v solutio of non electrolyte and non volatile solute at 298 K then molar mass in g mol 1 of solute is 1 10 2 100 3 90 4 400

Chem This section contains 35 SINGLE CORRECT TYPE questions Each question has 4 choices 1 2 Read More The protecting power of lyophilic colloidal sol is expressed in terms of O Critical micelle concentration O Oxidation number O Coagulation value

Which of the following statements are correct 1 The increasing order of osmotic pressure of 0 1 M aqueous solution containing different electrolyte is as follows 0 1 M Glucose 0 1 M NaCl 0 1 MgCl 2 Density of a solution is independent of temperature 3 Camphor has comparatively larger value of Kf as compared to other common solvents 4 Limiting value of van t Hoff factor of K4Fe CN 6 is 11 a Only 1 and 2 c Only 1 2 and 4 b Only 1 and 3 d All of these

2 Colligative properties are a dependent only on the concentration of the solute and independent of the solvent s and solute s identity b dependent only on the identity of the solute and the concentration of the solute and independent of the solvent s identity c dependent on the identity of the solvent and solute and thus on the concentration of the solute d dependent only on the identity of the solvent and the concentration of the solute and independent of the solute s identity