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Syllabus

Q. Define-

i) Molal elevation constant.

ii) Molal Depression constant.0.2g sample of H2O2 required 10 ml of N KMnO4 in a tritation in the prisence of H2SO4 . Find the purity of H2O2 .

ans = 85%

what are the applications of Henry's law?For [CrCl3.xNH3] elevation in boiling point of 1 molal solution is double of one molal urea solution, hence what is the value of x if the complex is completely ionised??

which is more concentrated 1 molar or 1 molal?

What is a decimolar solution?

1) 0.01MNaCl

2) 0.005M C2H5OH

3) 0.005M MgI2

4) 0.01M MgSO4

A decimolar solution of potassium ferricyanide (K

_{4}[Fe(CN)_{6}]) is 50% dissociated at 300k. calculate the osmotic pressure of solution.The boiling point of C

_{6}H_{6}, CH_{3}OH, C_{6}H_{5}NH_{2}& C_{6}H_{5}NO_{2}are 80^{o}C,65^{o}C,184^{o}C &212^{o}C respectively.Which will show highest vapour pressure at room temp?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.}The mol. mass odf NaCl determined by studying freezing point depression of its 0.5% aq. sol. is 30 . The degree of dissociation of NaCl will be?

what are the differences btw ideal and non ideal solns?

1) 1M glucose. 2) 1M KCl. 3) 1M Al(NO3)3

4) 1M Na2SO4

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

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

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.

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

^{o}C benzene has a vapour pressure of 900 torr and toluene has a vapour pressure of 360 torr. What is the mole fraction of benzene in the mixture with toluene that will be boil at 88^{o}C at 1 atm pressure, benzene -toluene form an ideal solution.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?

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?What are the limitations of Henry's law?

What is the Van't Hoff Factor in K_{4}[Fe(CN)_{6}] and BaCl_{2}? AND How it is calculated here ?(a) 1 gm atom of C

(b) 1 / 2 moles of $C{H}_{4}$

(c) 10 ml of water

(d) $3.011\times {10}^{23}$atoms of oxygen.

equivalent mass of H3PO4 for the given reaction

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

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

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

At 40 degreee celcius the vapour pressure, in torr, of methyl aclohol-ethyl alcohol solutions is represented by P= 119x + 135 where x is the mole fraction of methyl alcohol. what are vapours pressures of the pure components at this tempreature?

why a person suffering from high blood pressure is advised to take minimum quantity of common salt?

Q.5. At 675K, ${H}_{2}\left(g\right)$ and$C{0}_{2}\left(g\right)$ react to form CO(g) and ${H}_{2}O\left(g\right)$, ${K}_{p}$ for the reaction is 0.16. If a mixture of 0.25 mole of ${H}_{2}\left(g\right)$ and 0.25 mol of $C{0}_{2}$ is heated at 675K, mole % of CO(g) in equilibrium mixture is -

(a) 7.14

(b) 14.28

(c) 28.57

(d) 33.33

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

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

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)?

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).The protron concentration in the resulting solution is

1. 1.25M 2. 1.5M 3. 2.5M 4. 0.75M

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

$\mathrm{M}-1.\mathrm{Two}\mathrm{solid}\mathrm{compounds}\mathrm{A}\mathrm{and}\mathrm{B}\mathrm{dissociate}\mathrm{into}\mathrm{gaseous}\mathrm{products}\mathrm{at}20\xb0\mathrm{C}\mathrm{as}\phantom{\rule{0ex}{0ex}}\left(\mathrm{i}\right)\mathrm{A}\left(\mathrm{s}\right)\rightleftharpoons \mathrm{A}\text{'}\left(\mathrm{g}\right)+{\mathrm{H}}_{2}\mathrm{S}\left(\mathrm{g}\right)\left(\mathrm{ii}\right)\mathrm{B}\left(\mathrm{s}\right)\rightleftharpoons \mathrm{B}\text{'}\left(\mathrm{g}\right)+{\mathrm{H}}_{2}\mathrm{S}\left(\mathrm{g}\right)\phantom{\rule{0ex}{0ex}}\mathrm{At}20\xb0\mathrm{C}\mathrm{pressure}\mathrm{over}\mathrm{excess}\mathrm{solid}\mathrm{A}\mathrm{is}50\mathrm{mm}\mathrm{and}\mathrm{that}\mathrm{over}\mathrm{excess}\mathrm{solid}\mathrm{B}\mathrm{is}68\mathrm{mm}\mathrm{find}:\phantom{\rule{0ex}{0ex}}\left(\mathrm{a}\right)\mathrm{The}\mathrm{dissociation}\mathrm{constant}\mathrm{of}\mathrm{A}\mathrm{and}\mathrm{B}\phantom{\rule{0ex}{0ex}}\left(\mathrm{b}\right)\mathrm{Relative}\mathrm{no}.\mathrm{of}\mathrm{moles}\mathrm{of}\mathrm{A}\text{'}\mathrm{and}\mathrm{B}\text{'}\mathrm{in}\mathrm{the}\mathrm{vapour}\mathrm{phase}\mathrm{over}\mathrm{a}\mathrm{mixture}\mathrm{of}\mathrm{solid}\mathrm{A}\mathrm{and}\mathrm{B}.\phantom{\rule{0ex}{0ex}}\left(\mathrm{c}\right)\mathrm{Show}\mathrm{that}\mathrm{the}\mathrm{total}\mathrm{pressure}\mathrm{of}\mathrm{the}\mathrm{gas}\mathrm{over}\mathrm{the}\mathrm{solid}\mathrm{mixture}\mathrm{would}\mathrm{be}84.4\mathrm{mm}\phantom{\rule{0ex}{0ex}}\mathrm{M}-2.\mathrm{When}\mathrm{NO}\mathrm{and}{\mathrm{NO}}_{2}\mathrm{are}\mathrm{mixed},\mathrm{the}\mathrm{following}\mathrm{equilibria}\mathrm{readily}\mathrm{obtained};\phantom{\rule{0ex}{0ex}}2{\mathrm{NO}}_{2}\rightleftharpoons {\mathrm{N}}_{2}{\mathrm{O}}_{4}{\mathrm{K}}_{\mathrm{p}}=6.8{\mathrm{atm}}^{-1}\phantom{\rule{0ex}{0ex}}\mathrm{NO}+{\mathrm{NO}}_{2}\rightleftharpoons {\mathrm{N}}_{2}{\mathrm{O}}_{3}{\mathrm{K}}_{\mathrm{p}}=?\phantom{\rule{0ex}{0ex}}\mathrm{In}\mathrm{an}\mathrm{experiment}\mathrm{when}\mathrm{NO}\mathrm{and}{\mathrm{NO}}_{2}\mathrm{are}\mathrm{mixed}\mathrm{in}\mathrm{the}\mathrm{ratio}\mathrm{of}1:2,\mathrm{the}\mathrm{total}\mathrm{final}\mathrm{pressure}\mathrm{was}5.05\mathrm{atm}\phantom{\rule{0ex}{0ex}}\mathrm{partial}\mathrm{pressure}\mathrm{of}{\mathrm{N}}_{2}{\mathrm{O}}_{4}\mathrm{was}1.7\mathrm{atm}.\mathrm{Calculate}\phantom{\rule{0ex}{0ex}}\left(\mathrm{a}\right)\mathrm{the}\mathrm{equilibrium}\mathrm{partial}\mathrm{pressure}\mathrm{of}\mathrm{NO}.\phantom{\rule{0ex}{0ex}}\left(\mathrm{b}\right){\mathrm{K}}_{\mathrm{p}}\mathrm{for}\mathrm{NO}+{\mathrm{NO}}_{2}\rightleftharpoons {\mathrm{N}}_{2}{\mathrm{O}}_{3}$

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

_{1}, T_{2}and T_{3}. Temperature will be in order(A) T

_{1}= T_{2}= T_{3 }(B) T_{1}< T_{2}< T_{3 }(C) T_{1}> T_{2}> T_{3 }(D) T_{1}> T_{2}= T_{3}what is Formality and normality??

a. decinormal Al

_{2}(SO_{4})3b. decinormal BaCl

_{2}c. decinormal Na

_{2}SO_{4}d. all of the above

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

a) 30

b) 60

c) 180

d) 120

Calculate the molality of 1M solution of sodium nitrate. The Density of the solution is 1.25g/ml.

104. The values of observed and calculated molecular weight of calcium nitrate are respectively 65.6 and 164. The degree of dissociate of calcium nitrate will be:

(1) 25% (2) 50%

(3) 75% (4) 60%

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 ?a-1M C12H22O11

b-1M CH3COOH

c- 1M CaCl2

d- 1M NaCl

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 }.O

_{2}is bubbled through water at 293K. Assuming that O_{2 }exerts a partial pressure of 0.98 bar, calculate the solubility of O_{2}in grams per litre. The value of Henry's Law constant (K_{H}) for O2 is 34.84 kbarif 0.5 mol of BaCl2 is mixed with 0.2 mol of Na3PO4.How many maximum moles of Ba3(PO4)2 can be formed?

_{B}= 0.3 M_{A }where M_{B}& M_{A}are molecular wts. of B & A resp, what is the weight ratio of solvent & solute?For determining the molecular mass of polymers, osmotic pressure is preferred to other Colligative properties. Why????????

Solve this:

4. If 100 moles of H

_{2}O_{2}decompose at 1 bar and 300 K, the work done (kJ) by one mole of ${O}_{2\left(g\right)}$ as it expends against 1 bar pressure is$2{H}_{2}{O}_{2\left(f\right)}\rightleftharpoons 2{H}_{2}{O}_{2\left(l\right)}+{O}_{2\left(g\right)}$

(R=8.3 J K

^{-1}mol^{-1})(a) 124.50 (b) 246.00

(c) 498.00 (d) 62.25

why is freezing point depression of 0.1 M NaCl solution nearly twice that of 0.1 M glucose solution?

How to calculate equivalent weight?

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?Which of the followind pair of solutions can be expected to be isotonic at the same temperature?

1) 0.1M urea and 0.1M NaCl

2) 0.1M NaCl and 0.1M Na2SO4

3) 0.1M Ca(NO3)2 and 0.1M Na2SO4

what is the n-factor for phosphoric acid?

ans = 9g/L

(iv) 1.0 M KNO3

What is the molecular mass of cane sugar?

^{–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.}sodium chloride solution freezes at lower temperature than water but boils at higher temperature than water , explain.

Arrange the following solutions in increasing order of their boiling points:

(i) 0.001 m NaCl (ii) 0.001 m Urea (iii) 0.001 m MgCl2 (iv) 0.01 m NaCl

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

what is normality?

The vapour pressure of a dilute aqueous solution of glucose is 750 mmHg.Calculate 1)The molefraction of solute 2)Molality. Vapour pressure of water is 760mm Hg.

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.If O2

is bubbled through water at 393 K, how many millimoles of O2

gas would be dissolved in 1L of water? Assume that O2

exerts a

pressure of 0.95 bar.

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

Q.8

8. The critical density of the gas CO

_{2}is 0.44 g cm^{-3}at a certain temperature. if r is the radius of the molecule, r^{3}in cm^{3}is approximately. ( N is Avogadro number).$\left(\mathrm{A}\right)\frac{25}{\mathrm{\pi N}}\left(\mathrm{B}\right)\frac{100}{\mathrm{\pi N}}\left(\mathrm{C}\right)\frac{6}{\mathrm{\pi N}}\left(\mathrm{D}\right)\frac{25}{4\mathrm{N\pi}}$

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(a) 1 mol AgCl

(b) 0.25 mol AgCl

(c) 2 mol AgCl

(d) 0.40 mol AgCl