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Syllabus

Q. Define-

i) Molal elevation constant.

ii) Molal Depression constant.The vapour pressure of pure ether (molar mass 74 g/mol) at 293k is 588 m bar. A 10% (w/w) solutions of benzoic acid (molar mass=122 g/mol) was prepared in ether at 1293k. What will be the vapour pressure of solutions?

what are the applications of Henry's law?how can we calculate vant hoff factor of an polymer plzzzzz explain

which is more concentrated 1 molar or 1 molal?

0.15 gm of weak polybasic acid required 20 ml of.01M NaOH for complete neutralization.In a separate exp. 3.88 gm of sodium salt of this acid was dissolved in 100 gm of water and the solution was subjected to cryoscopic analysis ,frezzing pt. of the sol. was found to be -.93 degree celcius .K

_{f}for water is 1.8.6 KKg/mole.deduce formula of salt and molar mass of acid?What is a decimolar solution?

A decimolar solution of potassium ferricyanide (K

_{4}[Fe(CN)_{6}]) is 50% dissociated at 300k. calculate the osmotic pressure of solution.Resistance of a conductivity cell filled with 0.1 M is 100 ohm. If the resistance of the same cell when filled with 0.02 M KCl solution is 520 ohms, calculate the conductivity and molar conductivity of the 0.02 M KCl solution. Conductivity of 0.1 M KCl solution is 1.29*10

^{-2}S cm^{-1.}what are the differences btw ideal and non ideal solns?

find boiling point of solution containing 0.52g of glucose dissolved in 80.2 g of water. kb=0.52 Kkg/m.is the answer=373.132???

the concentration of NO3 ions when equal volumes of 0.1 M AgNO3 and 0.1 M Nacl are mixed together is ?

what is the mole fraction of the solute in 2.5 m aqueous solution ??

1.partial pressure of benzene and toluene

2.total vapour pressure

vapour pressure of chloroform and dichloromethane at 298 k are 200mm of hg and 415mm of hg respectively.

1)calculate the vapour pressure of solution prepared by mixing 25.5 g of chloroform and 40g of dichloromethane at 298K.

2)mole fraction of each component in vapour phase.

An aqueous solution of NaCl freezes below 273K. Explain the lowering in freezing point of water with the help of suitable diagram..

why aquatic species are more comfortable in cold water than warm water?

R-COOH dimerises in benzene upto 50% and it ionises upto 10% in water.Detrmine the ratio of Van't hoff factors in dimerisation v/s ionisation?

If N2 gas is bubbled through water at 293 K, how many millimoles of N2 gas would dissolve in 1 litre of water. Assume that N2 exerts a partial pressure of 0.987 bar. Given that Henrys law constant for N2 at 293 K is 76.48 kbar.

1. NaCl or CaCl

_{2}is used to clear snow from roads. why2. what is an antifreeze?

3. what is de icing agent?

4. what is vant hoff factor for a factor which undergoes tetramerisation in an organic compound.

Q- What is meant by semimolar and decimolar solutions?

Why KMnO

_{4}cannot be passed through filter paper?a motor radiator is 8l to which 2 litres of CH3OH(d=0.8g/ml)is added.calculate the lowest temperature at which water in the radiator of vehicle will not freeze.Kf of water=1.86Kg/mol

What is the significance of Henry's Law constant KH?

A solution of glucose in water is labelled as 10% w/w, what would be the molality and mole fraction of each component in the solution? If the density of solution is 1.2 g mL

^{−1}, then what shall be the molarity of the solution?_{2 ,}1M urea, 1M FeCL_{3 ,}1m naclwhy a person suffering from high blood pressure is advised to take minimum quantity of common salt?

how is

m= w2/m2 // w1/1000

?

how did it come?

What are the limitations of Henry's law?

If k

_{f}for water is 1.86 K kg mol^{1}, what is the freezing point of 0.1 molal solution of a substance which undergoes no dissociation or association of solute?What is the Van't Hoff Factor in K_{4}[Fe(CN)_{6}] and BaCl_{2}? AND How it is calculated here ?what is delta

_{mix}H and delta_{mix}V for non ideal solutions...and why pls explain_{}as soon as possible.........

equivalent mass of H3PO4 for the given reaction

H3PO4 +Ca(OH)2 --> CaHPO4 + 2H2O

Calculate the osmotic pressure of a solution obtained by mixing 100cm

^{3}of 1.5% solution of urea (molar mass =60) and 100cm^{3 }of 3.42 % solution of cane sugar (molar mass=342) at 20^{o}C (R=0.082litre atm/degree/mol).what is anoxia?

the density of a solution prepared by dissolving 120g of urea in 1000g of water is 1.15g/ml .The molarity of soltuion is:

1.78M

1.02 M

2.05 M

0.5 M

Two liquids A and B on mixing produce a warm solution. Which type of deviation from Raoult's law does it show?

what is expected value of van,t Hoff factor for K3 [Fe(CN)6] in dilute solutions?

calculate the amount of KCL which must be added to 1Kg of water so that the freezing point is depressed by 2K.(Kf for water =1.86 K Kg/mol)?

Two liquids A and B boil at 145 C and 190 C respectively.Which of them has higher vapour pressure at 80 C.Give reason..-

Pre board question

Plz help.What will be the answer

Thevapour pressure of pure benzene at a certain temperature is 0.850 bar. A non-volatile, non-electrolyte solid weighing 0.5 g whenaddedto 39.0 g of benzene (molar mass 78 g mol -1). Vapour pressureofthe solution, then, is 0.845 bar. What is the molar mass of thesolidsubstance?1)MOLe Fraction of NaOH

2)Molality of NaOH

3)Molarity of NaOH

Density of NaOH solution is 1.038g/cm3

a 2g of benzoic acid dissolve in 25g of benzene shows a depression in freezing point of 1.62 k.

molal depression constant for benzene is 4.9 KKg/mol. what is the % of association of acid.

if it forms a dimer in sol

^{n }.1.70 g of AgNO

_{3}reacts with 100 mL of 0.1 M HCl to produce 1.435 g of AgCl and 0.63 g of HNO_{3}.HERE ANSWER GIVEN IS Total mass of reactants = 1.70 + (100×0.1×10

^{-3}×36.5) = 2.065gI DIDNT GET THE PART GIVEN IN BRACKET CAN U ELABORATE IT ?DOES IT MEAN THATTHE ACTUAL MASS OF A GIVEN ELEMENT IS EQUAL TO THE PRODUCT OF ITS VOLUME,MOLARITY AND MOLECULAR WEIGHT? IF YES,HOW?

Henry Law Constant For CO

_{2}In Water Is 1.67x10^{8}Pa At 298 K.Calculate The Quantity Of CO_{2 }In 500 ml Of Soda Water When Packed Under 2.5 atm CO_{2 }Pressure At 298 K ?what is Formality and normality??

A solution is prepared by dissolving 11g glucose in 200 cm

^{3}water at 30^{0}c. What is the mass percentage of glucose in solution ? The density of water at 30^{0}c is 0.996g /cm^{3}?Calculate the molality of 1M solution of sodium nitrate. The Density of the solution is 1.25g/ml.

38. A degree of dissociation of Al

_{2}(SO_{4})_{3}is 25% in a sclvent, then(1) Normal boiling point = experimental boiling point

(2) Normal osmotic pressure = 2 x experimental osmotic pressure

(3) NormaI molecular weight = 2 x experimental molecular weight

(4) Normal freezing point = $\frac{1}{4}$ x experimental freezing point

the mole fraction of water in a sulphuric acid solution is 085.calculate the molality of the solution

(1) 30% (2) 60% (3) 10% (4) 70%

if 0.5 mol of BaCl2 is mixed with 0.2 mol of Na3PO4.How many maximum moles of Ba3(PO4)2 can be formed?

What are the criteria for two liquids to be:

a) completely miscible

b) partially miscible

The partial pressure of ethane over a solution containing 6.56 × 10

^{−3}g of ethane is 1 bar. If the solution contains 5.00 × 10^{−2}g of ethane, then what shall be the partial pressure of the gas?what is the n-factor for phosphoric acid?

^{o}C . Calculate the dissociation of NaCl (Na = 23 , Cl = 35.5 , K_{f}for water is 1.87 K/mol).Please answer it with full explanation within today as quick as possible.For determining the molecular mass of polymers, osmotic pressure is preferred to other Colligative properties. Why????????

^{3 N /C EXISTS I in the region}Q.(i) 5.0 g of substance with molecular weight 200 is dissolved in 50 g of a solvent with molecular weight 60 and vapour pressure 40 cm Hg at 27$\xb0$C. Calculate vapour pressure of the solution at this temperature.

^{–1}) in 100 g of CS_{2}(vapour pressure = 854 torr) is 848.9 torr. The molecular formula of the solute is:-(1) X

(2) X

_{2}(3) X

_{4}(4) X

_{8 Kindly answer sir/mam.}0.7g of a sample of Na2CO3.xH2O were dissoled in water and the volume made up to 100ml . 20ml of this solution

required 19.8ml of 0.1 N HCl for complete neutralization . Find the value of x .

ans = ~2

In 10 L water 1 mole of Ca(OH)

_{2}is added with 1 mole of H_{2}SO_{4}.Determine van't hoff factor of final solution?why is freezing point depression of 0.1 M NaCl solution nearly twice that of 0.1 M glucose solution?

What is the molecular mass of cane sugar?

How to calculate equivalent weight?

How I3- behaves

(iv) 1.0 M KNO3

^{–1}. Lowest molecular mass of protein is(1) 18100 (2) 2200 (3) 82273 (4) 18132

FeCl

_{3}on reaction with potassium ferrocyanide in aqueous solution gives blue colour.When 0.01M of FeCl_{3}and 0.1M potassium ferrocyanide are placed in a beaker and seperated by a semi permeable membrane, identify whether there will be an appearance of blue colour on potassium ferrocyanide side due to osmosis.E xplain your answer.how many grams og KCl should be added to 1kg of water to lower its freezing point to -8.0c [kf= 1.86Kkg/mol?

Wht should be the max. concentration of solute in case a solution is to be ideal?

sodium chloride solution freezes at lower temperature than water but boils at higher temperature than water , explain.

What is the van't Hoff factor for a compound which undergoes tetramerization in an organic solvent ?

An x molal solution of a compound in benzene has a molefraction =0.2.what is the value of x?

Menthol is a crystalline substance with peppermint taste. A 6.2% solution of menthol in cyclohexane freezes at -1.95 ° C. Determine the molar mass of menthol. The freezing point and molal depression constant of cyclohexane is 6.5 °C and 20.2 K/m respectively.

Why is vapour pressure of solution of glucose in water lower than water?

A solution containing 30g of non-volatile solute exactly in 90g of water has a vapour pressure of 2.8 kpa at 298 k. further, 18g of water is then added to the solution & the new vapour pressure becomes 2.9 kpa at 298 k. Calculate.a. Molar mass of the solute b. Vapour pressure of water at 298k