Solutions Questions and Answers

S E 22 M m m nim n m 20x 80 00 40x 2000 20x600 30x20000 40 x 30 30x60 2X4x4x 12 36 108 x 10 6 12 18 X 105 43 333 gram Answer 23 46 Answer rated as Satisfied Contact Tutor option is selected sir why did we have square in nume dear student this is actually a formula for polymers four kind of average molecular weight number average weight average viscosity average atc are thoro ach have different

The enthalpy of vaporization for water is 186 5 kJ mol the entropy of its vaporization will be 1 0 5 kJK mol 3 1 5 kJ K mole 2 1 0 kJK mole 8 4 2 0 kJK mole

The inactivation of a viral preparation in a chemical bath is found to be a first order reaction The rate constant for the viral inactivation if the beginning 1 5 of the virus is inactivated per minute is Given In 100 0 01511 AAJ KA TOPPER 98 5 2 2 5 10 sec 1 1 25x10 sec 3 5 10 sec 4 2 5x10 min Consider the following standard electrode potentials in volts in aqueous solution

29 How many g of dibasic acid mol weight 200 should be present in 100 ml of the aqueous solution to give strength of 0 1 N 1 10 g 3 19 2 2 g 4 20 g

Which among the following statements is false 1 The correct order of osmotic pressure for 0 01 M aqueous solution of each compound is BaCl KCI CH COOH Sucrose 2 The osmotic pressure of a solution is given by the equation MRT where M is the molarity of the solution 3 Raoult s law states that the vapour pressure of a component over a solution is proportional to it s mole fraction 4 Two sucrose solutions of the same molaltiy prepared in different solvents will have the same freezing point depression

n M Which phenomenon occurs when an electric field is applied to a colloidal solution and electrophoresis is prevented by some suitable means Reverse osmosis takes place Electrosmosis takes place Dispersion medium begins to move Dispersion medium becomes stationary

A semipermeable membrane separates a 0 2 M glucose solution from a 0 4 M glucose solution The solvent water will flow from the solution to the solution The volume of the 0 4 M solution will 0 4 M 0 2 M decrease 0 2 M 0 4 M decrease 0 2 M 0 4 M increase Click the answer you think is right Do you know the answer

A certain amount of a metal whose equivalent m is 28 displaces 0 7 L of H at S T P from an hence mass of the element is 1 1 75 g 2 0 875 g 3 3 50 g 4 7 00 g Number of Fe atoms in 100 g Haemoglobin

Id The rate constant for the second order reaction 2NO g 2NO g O g is 0 54 M s at 300 C How long in seconds would it take for the concentration of NO to de 0 62 M to 0 28 M 3 pts

48 If the osmotic pressure of a 0 010 M aqueous solution of sucrose at 27 C is 0 25 atm then the osmotic pressure of a 0 010 M aqueous solution of NaCl at 27 C is 3 0 25 atm 1 0 062 atm 2 0 12 atm 4 0 50 atm

4 Acetone chloroform 490 Benzene and toluene form nearly ideal solutions At 20 C the vapour pressure of benzene is 75 torr and that of toluene is 22 torr The partial pressure of benzene at 20 C for a solution containing 78 g of benzene and 46 g of toluene in torr is 1 25 3 53 5 2 50 4 37 5 ans

How many times more soluble is AgCl when added to a solution of NaCN A colorless complex ion Ag CN 2 results from this addition Ksp for AgCl is 1 8 x 10 10 and Kf for Ag CN 2 is 1 0 x 1021 A 8 1 x 10 7 B 1 0 x 1021 C 1 8 x 10 10 D 1 8 x 1011 O A B A

A solution of acetone in ethanol 1 Obeys Raoult s law 2 Shows a negative deviation from Raoult s law 3 Shows a positive deviation from Raoult s law 4 Behaves like a near ideal solution HO OH incomplete

The system N O 2 NO maintained in a closed vessel at 60 C a pressure of 5 atm has an average i e observed molecular weight of 69 calculate K At what pressure at the same temperature would the observed molecular weight be 230 3

When 5 litres of a gas mixture of methane a propane is perfectly combusted at 0 C ar 1 atmosphere 16 litre of oxygen at the san temperature and pressure is consumed TI amount of heat released from this combustion in AH comb CH 890 kJ mot AH comb C h 2220 kJ mol is 1 32 3 317 2 38 4 477

1 1 1 1 2 1 2 3 3 3 2 1 01 3 1 At a constant temperature which of the following aqueous solutions will have the maximum vapour pressure Mol wt NaCl 58 5 H SO 98 0 g mol 3 1 molal H SO aq 1 1 molal NaCl aq 2 1 molar NaCl aq 4 1 molar H SO aq When two reactants A and B are mixed to give products C and D the reaction quotient Q at

An azeotropic solution of two liquids has boiling point lower than either of them when i 1 shows negative deviation from Raoult s law 2 shows no deviation from Raoult s law 3 shows negative deviation from Raoult s law 4 is saturated

Latent heat of vaporization of water is 9 72 kcal mol at 373 15 K calculate molal boiling point elevation constant of water a 5 2 c 52 2 b 0 052 d 0 52

3 At a temperature under high pressure Kw H O 1x10 10 A solution of pH 5 4 under these conditions is said to b a acidic c neutral b basic d amphoteric 12

The molality of a sulphuric acid solution is 0 2 mol kg The total weight of the solution containing 1 mol H SO4 O 1000g O 1098 g O 5000 g O 5098 g

14 What is the pH of 10 6 M HCI at 25 C NCERT 1 6 3 60H eil 2 7 4 7 beng ins

The total number of electrons present in 18 mL of water 1 6 02 x 1022 2 6 02 x 1023 3 6 02 x 1024 4 6

21 Ammonia gas is passed into water yielding a solution of density 0 93 g cm and containing 18 6 NH by weight The mass of NH3 per cc of the solution is 1 0 17 g cm 3 0 51 g cm 2 0 34 g cm 4 0 68 g cm

Estimate the lowering of vapour pressure due to the solute glucose in a 1 0 M aqueous solution at 100 C a 10 torr b 18 torr c 13 45 torr d 24 torr

1 An aqueous solution of 6 3g of oxalic acid dihydrate is made 13 upto 250 mL The volume of 0 1 N NaOH required to completely neutralise 100mL of this solution is 2 20mL 4 4mL 1 40mL 3 10mL 1

34 When Hgl is added in KI solution The freezing point of solution 1 increases 2 decreases 3 Remains unchanged 4 Can t predict wol sv

451 P The vapour pressure of pure A is 10 torr and the same temperature when 1 g of B is dissolved in 20 gm of A its vapour pressure is reduced to 9 0 torr If the molecular mass of A is 200 amu then the molecular mass of B is 1 100 amu 3 75 amu 2 90 amu 4 120 amu

At 300 K the two solutions of glucose A and B with respective concentrations 0 1 M and 0 01 M are separated by semipermeable membrane How much external pressure need to be applied and on which solution so as to preven osmosis 1 0 2463 atm pressure is applied on solution B 2 2 217 atm pressure is applied on solution A 3 0 0246 atm pressure is applied on solution B 4 0 0217 atm pressure is applied on solution A

A mixture contains 1 mole of volatile liquid A P 100 mm Hg and 3 moles of volatile liquid B P 80 mm Hg If solution behaves ideally the total vapour pressure of the distillate is a 85 mm Hg c 90 mm Hg b b 85 88 mm Hg d 92 mm Hg

8 The amount of energy released when 10 2 atoms of Cl vapours are converted to CI ions according to the equation Cl g e Cl g is 58 10 10 J Calculate the AH of Cl atom in kJ mol and eV atom a 0 036 eV atom b 3 48 eV atom e 0 038 eV atom d 0 361 eV atom

37 The lowering of vapour pressure of a solvent by addition of a non volatile solute to it is directly proportional to 1 The strength of the solution 2 The nature of the solute in the solution 3 The atmospheric pressure 4 All

The indicator phenol red is half in the ionic form when pH is 7 2 If the ratio of the undissociated form to the ionic form is 1 5 find the pH of the solution With the same pH for solution if indicator is altered such that the ratio of undissociated form to dissociated form becomes 1 4 find the pH when 50 of the new indicator is in ionic form

solut mole fraction of M the following figure Here XL and XM represent mole fractions of L and M respectively in the solution The correct statement s applicable to this system is are c PL 1 Z 0 the deviath XM A Attractive intermolecular interactions between L L in pure liquid L and M M in pure liquid M are stronger than those between L M when mixed in solution B The point Z represents vapour pressure of pure liquid M and Raoult s law is obeyed when XL O C The point Z represents vapour pressure of pure liquid L and Raoult s law is obeyed when XL 1 D The point Z represents vapour pressure of pure liquid M and Raoult s law is obeyed from 2017 XL 0 to XL 1 019

Gold number of gum arabic is 0 15 The amount of gum arabic required to protect 100 ml of gold sol from coagulation by 10 ml of 10 NaCl solution is A 0 15 millimoles B 0 15 mg C 1 5 millimoles D 1 5 mg

Equimolar solutions of KCl and compound X in H O show depressions in freezing point in the ratio of 4 1 Assuming KCl to be completely ionized the compound X in solution must A Dissociate to the extent of 50 B Hydrolyse to the extent of 80 C Dimerize to the extent of 50 mi of D Trimerize to the extent of 75

An element X of atomic mass 25 g exists as X4 in benzene to the extent of 100 When 10 30 g of saturated solution of X in benzene is added to 20 0 g of benzene the depression in freezing point of the resulting solution is 0 51 K IfK of benzene is 5 1 K kg mol the solubility of X in 100 g of benzene will be A 2 9 g B 3 0 gute eet brom C 0 7 g bD 0 3 g

Partial pressure needed to dissolve 21 mg of CO in 100 g of H O at 298 K is K of CO is 2 937 K Pa m mol 1 14 0 kpa 2 7 0 kpa DE THE OPT 3 121 0 kpa S 4 79 0 kpa

The vapour pressure of pure benzene at 50 C is 268 Torr How many moles of non volatile solute per mol of benzene is required to prepare a solution of benzene having a vapour pressure of 167 Torr at 50 C A 0 377 pe C 0 623 D 0 395 B 0 605 29705110CESIA

At 47 C the vapour pressure of pure ethyl bromide C H Br is 10 Torr and that of pure ethyl chloride C H Cl is 40 Torro Assuming ideal behaviour mole fraction of C H Cl in the liquid state is A 0 20 D 0 25 OUE EN B 0 50 and liathy A C 0 75

The freezing point of a dilute solution of acetamide in glacial acetic acid is 298 K This is the value when crystals of 1 ice first appears acetic acid first appears 2 acetamide first appears 4 both appear together

When mercuric iodide is added to the aqueous solution of potassium iodide then Freezing point is increased Boiling point is increased 3 Freezing point does not change 4 Boiling point does not change

11 Methanol and C H OH form an ideal solution Solution is prepared by mixing 32 gm of CH C and 23 gm of C H OH at 300K At 300K Po 90 mm of Hg and Po 51 mm of Calculate methanol ethanol S i partial vapour pressure of its constitutents and total vapour pressure of solution ii Mole fraction of each component in vapour phase

An aqueous solution contains an unknown concentration of Ba When 50 mL of a 1 M solution of Na SO4 is added BaSO4 just begins to precipitate The final volume is 500 mL The solubilit product of BaSO is 1 x 10 What is the original concentration of Ba 10 M 1 1 0 10 10 3 2 10 M 2 5 x 10 M 4 1 1 x 109 M MAINS 2018

etermine What is the boiling point of 1 molal aqueous solution of NaCl K 0 52 K molal 1 99 48 C 2 98 96 C 3 100 52 C 4 101 04 C

Which of the following solutions will have pH A 2 0 g of NaOH in 500 cm solution C 100 cm solution of 0 1 N Ca OH 13 assuming complete dissociation B 100 cm solution of 0 05 M Ca OH D 4 0 g of NaOH in 500 cm solution

For a dilute solution containing 2 5 g of a non volatile non electrolyte solute in 100 g of water the elevation in boiling point at 1 atm pressure is 2 C Assuming concentration of solute is much lower than the concentration of solvent the vapour pressure mm of Hg of the solution is take K 0 76 K kg mol A 724 C 736 B 740 D 718 2012 Fe CN Mol Wt 329 in 100 g of

S rhombic O g SO g AH 297 5 kJ S monoclinic O g SO g AH 300 kJ The above data can predict that 1 Rhombic sulphur is yellow in colour 2 Monoclinic sulphur has metallic lustre 3 Monoclinic sulphur is more stable 4 AH Transition process of S R to S M is endothermic

4 Solute flows from low concentration to high concentration 1 mole glucose is added to 1 L of water K H O 0 512 K kg mole 1 boiling point of 1 373 512 C 3 99 488 C 2 100 512 C 4 372 488 C tion will be nivod If solution has vapour pressure 340 mm Hg

18 Liquids A p 360 mm Hg and B pg 320 mm Hg are mixed If solution has vapour pressure 340 mm mole fraction of B in the solution will be 1 3 33 34 2 34 1 4

A sample of steel weighing 0 30 g was subjected to a chemical reaction to convert its sulphur impurity to H S g The evolved gas required 2 40 ml 0 02 N iodine solution Which of the following statement s is are true A B C A lodine is reduced to iodide B H S is oxidized to S C Steel contain 0 256 of S by weight D The reaction of H S with I is a precipitation reaction rather than a redox reaction