Solutions Questions and Answers

25 On addition of one ml solution of 10 Naci to 10 ml gold sol in the presence of 0 25 gm of starch the coagulation is just prevented Starch has the following gold number

x 2 A solution of ethanol in water is 10 by volume If the solution and pure ethanol have densities of 0 9866 g cc and 0 785 g cc respectively find the per cent by weight

4 Two bottles of A and B contains 1M and 1m aqueous solution d 1gmL of sulphuric acid respectively 1 A is more concentrated than B 2 B is more concentrated than A 3 Concentration of A concentration of B

137 What is the percentage hydrolysis of NaCN in N 80 solution when the dissoelation constant for HCN in 1 3 109 and Kw IC 1 0 10 14 1 2 48 3 8 2 2 5 26 4 9 6 1

The mole fraction of a solute in a solution is 0 1 At 298 K molarity of this solution is the same as its molality Density of this solution at 298 K is 2 0 g cm The ratio of the molecular weights of the solute is JEE Advanced 2016 3 124 and solvent MWsolute MWsolvent

1 A solution of sodium sulphate contains 92 g of Nations per kilogram of water The molality of Nations in that solution in mol kg is a 16 b 4 c 132 2019 Main 9 Jan I d 8

0 5 molal aqueous solution of a weak acid HX is 20 ionised If K for water is 1 86 K kg mol the lowering in freezing point of the solution is 1 0 56 K 2 1 12 K 3 0 56 K 4 1 12 K

c 21 Which of the following statements about the composition of the vapour over an ideal 1 1 molar mixture of benzene and toluene is correct Assume that the temperature is constant at 25 C Given vapour pressure data at 25 C benzene 2016 12 8 kPa toluene 3 85 kPa a Not enough information is given to make a prediction b The vapour will contain a higher percentage of benzene c The vapour will contain a higher percentage of toluene d The vapour will contain equal amounts of benzene and toluene

100 mL of 0 1N I oxidizes Na S O in 50 ml solution to Na S O The normality of this hypo soluti against KMnO which oxidizes it to Na SO would be A 0 1 B 0 2 C 1 0 D 16

5 Calculate the pH of a buffer solution prepared by dissolving 30g of Na CO in 500 mL of an aqueous solution containing 150 mL of 1M HCl Ka for 3 133 109 150 HCO 5 63 x 10 11 log 1 8 197 3 10 197 0 05 2 9 197 4 11 197

On adding 1mL solution of 10 NaCl to 10 mL 89 gold sol in presence of 0 25 g starch so that coagulation is just prevented what will be gold number of starch 1 0 25 2 2 5 3 250 4 0 025

21 Calculate the mass percentage of benzene C6H and carbon tetrachloride CCL if 22 g of benzene is dissolved in 122 g of carbon tetrachloride 22 Calculate the mole fraction of benzene in solution containing 30 by mass in carbon tetrachloride 2 3 Calculate the molarity of each of the following solutions a 30 g of Co NO3 2 6H O in 4 3 L of solution b 30 mL of 0 5 M H SO4 diluted to 500 mL 2 4 Calculate the mass of urea NH CONH required in making 2 5 kg of 0 25 molal aqueous solution 2 5 Calculate a molality b molarity and c mole fraction of KI if the density of 20 mass mass aqueous KI is 1 202 g mL

An ideal solution was obtained by mixing methanol and ethanol If the partial vapour pressure of methanol and ethanol are 2 619 K Pa and 4 556 K Pa respectively the composition of vapour in terms of mole fraction will be 1 0 635 MeOH 0 365 EtOH 2 0 365 MeOH 0 635 EtOH 3 0 574 MeOH 0 326 EtOH 4 0 173 MeOH 0 827 EtOH

8 How many g of dibasic acid mol wt 200 should be present in 100 ml of its aqueous solution to give 2003 decinormal strength a 1 g 10g b 2 g d 20 g

20 Decomposition of a non volatile solute A into another non volatile solute B and C when dissolved in water follow first order kinetics as A 2B C When one mole of A is dissolved in 180 g of water and left for decomposition vapour pres sure after 12 hours was found to be 20 69 mm of Hg Determine V P of the solution after 30 hours Assume constant temperature through out to be 27 C and V P of pure water at 27 C is 24 mm of Hg

a total pressure of I atm The system N O4 2 NO maintained in a closed vessel at 60 C a pressure of 5 atm 2 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

6 A detergent C12H25SO Na solution becomes a colloidal sol at a concentration of 10 3 M On an 100 average 1013 colloidal particles are present in 1 mm The average number of ions which are contained by one colloidal particle micelle is Given N 6 x 10 11

The difference between elevated boiling point and depressed freezing point of an aqueous solution is 102 C The molality of the solution if it contains non volatile and non electrolyte solute will be 2 1 K Kb 3 K K 3 102 2 K K 3 4 K K

Two bottles of A and B contains 1M and 1m aqueous solution d 1g mL of sulphuric acid respectively 1 A is more concentrated than B 2 B is more concentrated than A 3 Concentration of A conc of Bed 4 It is not possible to compare the entration

200 ml of a sample of water required 2 94 mg of K Cr O eq wt 49 in the presence of H SO for the oxidation of dissolved organic matter in it The COD of the water sample is a 2 4 ppm b 4 8 ppm c 9 6 ppm d 16 ppm

AIMS 2017 0 5g of an unknown solute is dissolved in 295 g solvent If molarity and density of solution are 47 0 05 M and 1 5 g cc respectively The molecular weight of unknown solute is 1 375 2 425 3 400 The depression in freezing poi Molality 4 500

The mass of glucose that should be dissolved in 50 g of water in order to produce the same lowering of vapour pressure as is produced by dissolving 1 g of urea in the same quantity of water is a 1 g c 6 g b 3g d 18 g 2006

10 ml of HCl solution gave 0 1435 gm of AgCl when treated with excess of AgNO3 The normality of the HCl solution is 1 0 1 2 3 3 0 3 4 0 2

Solvent which is better to be used during ebullioscopic measurement has 1 High K 3 K K 2 Low K 4 Unpredictable

26 The molecular weight of benzoic acid in benzene as determined by depression in freezing point method corresponds to 1 Ionisation of benzoic acid 2 Dimerization of benzoic acid 3 Trimerization of benzoic acid 4 Solvation of benzoic acid

Single The vapour pressure of pure benzene at 25 C is 639 7 mm Hg and the vapour pressure of solution of solute in benzene at 25 C is 631 9 mm Hg The molality of the solution is 7 Types A 0 156 C 0 518 B 0 108 D 0 815

10 101 ei nijulpe to jaio emilion The cryoscopic constant for acetic acid is 3 6 K kg mol A solution of 1 g of a hydrocarbon in 100 g of acetic acid freezes at 16 14 C instead of the usual 16 60 C The hydrocarbon contains ositib 0 C01 di noitu 92 3 carbon What is the molecular formula 10120 0 70m

On adding a non volatile solute to a solvent the vapour pressure of solvent decreases and becomes z x vapour pressure of solvent where z is 1 mole fraction of solvent 2 mole fraction of solute 3 molality 4 molarity

separate 1 Chloroform and Aniline 2 Ether and Toluene 3 Hexane and Toluene

A 0 0020 m aqueous solution of an ionic compound Co NH3 5 NO CI freezes at 0 00732 C Number of moles of ions which 1mol of ionic compound produces on being dissolved in water will be K 1 86 C m 1 1 2 2 3 3 4 4

1 00g of a non electrolyte solute molar mass 250g mol was dissolved in 51 2g of benzene If the freezing point depression constant K of benzene is 5 12 K kg mol 1 the freezing point of benzene will be lowered by 2 0 3 K 4 0 2 K 1 0 4 K 3 0 5 K

ed K for benzene 5 12 kg mol K The molar volume of liquid benzene density 0 877 g ml increases by a factor of 2750 as it vaporizes at 20 C and that of liquid toluene density 0 867gml increases by a factor of 7720 at 20 C A Solution of benzene toluene has a vapour pressure of 46 0 torr Find the mole fraction of benzene in the vapour above the solution orallol glectrodes of cross section area 4cm

Cane sugar underoges the inversion as follow C 2H 2O11 H O CH O CH 2O6 12 6 12 If solution of 0 025 moles of sugar in 200 gm of water show depresion in freezing point 0 37 then what sucrose has inverted K H O 1 86 K kg mol

and mole fraction of solute Calculate the amount of ice that will separate out of cooling a solution containing 50g of ethylene glycol in 200 g water to 9 3 C K for water 1 86 K mol kg A solution of crab hemocyanin a pigmented protein extracted from crabs was prepared by dissolving

The density of 3 M solution of NaCl is 1 25 g ml Calculate molality of the 1 solution

molecular formula K H O 0 52 K mol kg A complex is represented as CoCl xNH It s 0 1 molal solution in a solution show AT 0 558 C K for H O is 1 86 K mol kg Assuming 100 ionisation of complex an coordination no of Co is six calculate formula of complex Agolution containin

3 2 mol of A is mixed with 3 mol of B to form an ideal solution such that the total vapour pressure over the solution becomes 500 mm Hg If 1 mol of B is further added vapour pressure becomes 450 mm Hg What is the vapour pressure of pure component B 1 675 mm Hg 2 950 mm Hg 3 200 mm Hg 4 575 mm Hg

8 For an ideal solution with pAP which of the following is 02 to no aki elom ons o true gh to mm 05 at onderong of a XA liquid X4 vapour XA vapour b XA liquid XA liquid XA vapour 193 c d XA liquid and X with each other sdu 201 2018i0022s fonod noitulos Amih ati automaad an do not bear any relationship rob si 1 2 onesned 502 1 4 CF 0 XA vapour vapour Tom

The freezing point of an aqueous solution of KCN containing 0 1892 mol Kg was 0 74 C On adding 0 095 mol of Hg CN the freezing point of solution was 0 53 C Assuming that complex is formed according to the equation Hg CN mCN Hg CN 2 The value of m is X then what is 2X 3

In cold climate water freezes causing damage to the car radiator Ethylene glycol is used as antifreeze agent Calculate the amount of ethylene glycol to be added to 4 kg of water to prev it from freezing at 8 C K H O 1 86 K kg mot

50 50 mL of 1 M oxalic acid is shaken with 0 5 g wood charcoal The final concentration of the solution after adsorption is 0 5 M What is the amount of oxalic acid adsorbed per gram of carbon b a 3 15 g c 6 30 g b 3 45 g d none of these vbmil Se

Artificial rain is caused by spraying a opposite charged collidal dust over a cloud b same charged collidal dust over a cloud c both d none of these

0 7 g of Na CO xH O is dissolved in 100 ml 20 ml of which required 19 8 ml of 0 1 NHCI The value of x is 1 4 2 3 3 2 4 1 diluted bu

The number of unit cells in a cube shaped ideal crystal of NaCl is 512 The number of unit cell along each edge of the ideal crystal is

2 Benzene and naphthalene form an ideal solution at room temperature For this process the true statement s is are a AG is positive b AS is positive system c AS surroundings 0 d AH 0 2013 Adv

28 When mercuric Iodide is added to the aqueous solution of potassium iodide 1 The boiling point does not change 2 Freezing point is raised 3 The freezing point is lowered 4 Freezing point does not change SOE

Which of the gas will not follow Henry s law HCI 2 He 3 0 2

N 3 15 g of ice 4 Same in all 37 Concentrated aqueous sulphuric acid is 98 H SO4 w v and has a density of 1 80 gmL 1 Molarity of solution 1 1 M 2 1 8 M 3 10 M 4 1 5 M 38 An element X has the following isotopic composition 56X 90 57X 8 59X 2 0 The hic mass of the naturally 45 The numb 1 8 3 7 46 Mole frac NaOH 1 0 16 3 0 25 Imp fo Ass

2 What is correct relation between mole fraction in vapour phase YA of A in terms of X If mole fraction in solution of A is X If PA is vapour pressure of A in pure state 1 1 XA PA 3 1 XAPO Y XA PA 2 1 XA 4 POXA

The Henry s law constant for solubility of gas A in water at 25 C is 10 atm The by volume of gas A 50 in gaseous mixture The number of moles of A dissolved in 100 mol of water at 10 atm pressure 298 K is A 5 104 B 10 x 104 C 5 10 D 10 x 10