Select Board & Class
Q. Define-
i) Molal elevation constant.
ii) Molal Depression constant.
what are the applications of Henry's law?
which is more concentrated 1 molar or 1 molal?
What is a decimolar solution?
A decimolar solution of potassium ferricyanide (K4[Fe(CN)6]) is 50% dissociated at 300k. calculate the osmotic pressure of solution.
what is the n-factor for phosphoric acid?
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.
In which of the following liquids are the Van der Waals forces of attraction between the molecules weakest?
A. Xe B. Kr C. Ar D. Ne E. He
what are the differences btw ideal and non ideal solns?
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 ??
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?
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.
which one is greater molality or molarity? why?
1. NaCl or CaCl2 is used to clear snow from roads. why
2. 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.
why does sea water freeze below [0] zero degree celsius?
Q- What is meant by semimolar and decimolar solutions?
What is the significance of Henry's Law constant KH?
FeCl3 on reaction with potassium ferrocyanide in aqueous solution gives blue colour.When 0.01M of FeCl3 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.
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?
why a person suffering from high blood pressure is advised to take minimum quantity of common salt?
What are the limitations of Henry's law?
11.1g of CaCl2 is present in 100ml of aqueous solution . the chloride ion concentration is
1. 1m 2. 2M 3. 0.5M 4. 0.2M
What is the Van't Hoff Factor in K4[Fe(CN)6] and BaCl2 ? AND How it is calculated here ?
equivalent mass of H3PO4 for the given reaction
H3PO4 +Ca(OH)2 --> CaHPO4 + 2H2O
Calculate the osmotic pressure of a solution obtained by mixing 100cm3 of 1.5% solution of urea (molar mass =60) and 100cm3 of 3.42 % solution of cane sugar (molar mass=342) at 20oC (R=0.082litre atm/degree/mol).
Why KMnO4 cannot be passed through filter paper?
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
what is expected value of van,t Hoff factor for K3 [Fe(CN)6] in dilute solutions?
1 mole urea and 1 mole NaCl are added to water.Kf = 1.86, Kb = 0.52(in K kg/mole) , determine the ratio of deltaTb v/s deltaTf for the solution (urea : NaCl)
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
The vapour pressure of pure benzene at a certain temperature is 0.850 bar. A non-volatile, non-electrolyte solid weighing 0.5 g when added to 39.0 g of benzene (molar mass 78 g mol -1). Vapour pressure of the solution, then, is 0.845 bar. What is the molar mass of the solid substance?
Q.1 What happens if a patient is given hypertonic solution of glucose? (1 mark)
Q.4 Why the boiling point of a liquid get raised on dissolution of non volatile solute in it ? (1 mark)
Q.6 What will happen to the boiling point of the solution on mixing two miscible liquids showing negative deviation from Raoult 's law? (1 mark)
how can we calculate vant hoff factor of an polymer plzzzzz explain
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 soln .
Henry Law Constant For CO2 In Water Is 1.67x108 Pa At 298 K.Calculate The Quantity Of CO2 In 500 ml Of Soda Water When Packed Under 2.5 atm CO2 Pressure At 298 K ?
what is Formality and normality??
Calculate the molality of 1M solution of sodium nitrate. The Density of the solution is 1.25g/ml.
what are the values of delta V mix for solutions showing positive and negative deviations from raoult's law?
the mole fraction of water in a sulphuric acid solution is 085.calculate the molality of the solution
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 happens when blood cells are placed in pure water?
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?
For determining the molecular mass of polymers, osmotic pressure is preferred to other Colligative properties. Why????????
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?
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
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?
(iv) 1.0 M KNO3
how is
m= w2/m2 // w1/1000
?
how did it come?
What is the molecular mass of cane sugar?
Calculate the solubility of carbon dioxide in water at 0 °C and a pressure of 3.00 atm. The solubility of carbon
sodium chloride solution freezes at lower temperature than water but boils at higher temperature than water , explain.
. What type of interactions exists between Cl2 and CCl4
What is the van't Hoff factor for a compound which undergoes tetramerization in an organic solvent ?
1.If we have 10 molal urea solution, calculate the mole fraction of urea and also calculate the w/w % of urea?
An x molal solution of a compound in benzene has a molefraction =0.2.what is the value of x?
in a solvent 50% of benzoic acid dimerises while the rest ionises. determine molar mass of acid which is observed and also its van't hoff factor.
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
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
E.g: 9876543210, 01112345678
We will give you a call shortly, Thank You
Office hours: 9:00 am to 9:00 pm IST (7 days a week)
Syllabus
Q. Define-
i) Molal elevation constant.
ii) Molal Depression constant.
39. 2 m aqueous solution of H2SO4 contains
(1) 49 g of H2SO4 per 250 g of solution
(2) 98 g of H2SO4 per 250 g of solvent
(3) 49 g of H2SO4 per 250 g of solvent
(4) 98 g of H2SO4 per 250 g of solution
what are the applications of Henry's law?
38. A degree of dissociation of Al2(SO4)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 = x experimental freezing point
which is more concentrated 1 molar or 1 molal?
What is a decimolar solution?
(a)C
(b)B
(c)Al
(d)Si
(d)
A decimolar solution of potassium ferricyanide (K4[Fe(CN)6]) is 50% dissociated at 300k. calculate the osmotic pressure of solution.
what is the n-factor for phosphoric acid?
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.
In which of the following liquids are the Van der Waals forces of attraction between the molecules weakest?
A. Xe
B. Kr
C. Ar
D. Ne
E. He
what are the differences btw ideal and non ideal solns?
NH3
Nitric acid
Sulphuric acid.
Sodium carbonate
Alcl3
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 ??
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?
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.
which one is greater molality or molarity? why?
1. NaCl or CaCl2 is used to clear snow from roads. why
2. 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.
why does sea water freeze below [0] zero degree celsius?
Q- What is meant by semimolar and decimolar solutions?
7. Raoult's law is not valid in.
(1) Non- ideal solution showing positive deviation.
(2) Non-ideal solution showing negative deviation.
(3) Mixture of two immiscible liquid.
(4) all of these
What is the significance of Henry's Law constant KH?
FeCl3 on reaction with potassium ferrocyanide in aqueous solution gives blue colour.When 0.01M of FeCl3 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.
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?
(1) Increases
(2) First increases then decreases
(3) Decreases
(4) First decreases then increases
why a person suffering from high blood pressure is advised to take minimum quantity of common salt?
What are the limitations of Henry's law?
11.1g of CaCl2 is present in 100ml of aqueous solution . the chloride ion concentration is
1. 1m 2. 2M 3. 0.5M 4. 0.2M
What is the Van't Hoff Factor in K4[Fe(CN)6] and BaCl2 ? AND How it is calculated here ?
(1) 18100 (2) 2200 (3) 82273 (4) 18132
equivalent mass of H3PO4 for the given reaction
H3PO4 +Ca(OH)2 --> CaHPO4 + 2H2O
(A) NH3 (B) PH3 (C) AsH3 (D) SbH3.
75. Which of the following is least basic?
(A) NF3 (B) NH3 (C) NCl3 (D) NI3
Calculate the osmotic pressure of a solution obtained by mixing 100cm3 of 1.5% solution of urea (molar mass =60) and 100cm3 of 3.42 % solution of cane sugar (molar mass=342) at 20oC (R=0.082litre atm/degree/mol).
Why KMnO4 cannot be passed through filter paper?
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
what is expected value of van,t Hoff factor for K3 [Fe(CN)6] in dilute solutions?
1 mole urea and 1 mole NaCl are added to water.Kf = 1.86, Kb = 0.52(in K kg/mole) , determine the ratio of deltaTb v/s deltaTf for the solution (urea : NaCl)
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
The vapour pressure of pure benzene at a certain temperature is 0.850 bar. A non-volatile, non-electrolyte solid weighing 0.5 g when added to 39.0 g of benzene (molar mass 78 g mol -1). Vapour pressure of the solution, then, is 0.845 bar. What is the molar mass of the solid substance?
Q.1 What happens if a patient is given hypertonic solution of glucose? (1 mark)
Q.4 Why the boiling point of a liquid get raised on dissolution of non volatile solute in it ? (1 mark)
Q.6 What will happen to the boiling point of the solution on mixing two miscible liquids showing negative deviation from Raoult 's law? (1 mark)
1)MOLe Fraction of NaOH
2)Molality of NaOH
3)Molarity of NaOH
Density of NaOH solution is 1.038g/cm3
how can we calculate vant hoff factor of an polymer plzzzzz explain
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 soln .
Henry Law Constant For CO2 In Water Is 1.67x108 Pa At 298 K.Calculate The Quantity Of CO2 In 500 ml Of Soda Water When Packed Under 2.5 atm CO2 Pressure At 298 K ?
what is Formality and normality??
i)0.1 m urea
ii)0.04m Al2(SO4)3
iii)0.05 m CaCl2
(iv)0.005 NaCl
The correct statement regarding the above solutions is:
a)freezing point will be the lowest in solution (i)
b) freezing point will be the highest in solution (iv)
c) vapour pressure will be the highest in solution (ii)
d)osmotic pressure will be the highest in solution (iii) ANS IS (b) pls explain how
Calculate the molality of 1M solution of sodium nitrate. The Density of the solution is 1.25g/ml.
what are the values of delta V mix for solutions showing positive and negative deviations from raoult's law?
the mole fraction of water in a sulphuric acid solution is 085.calculate the molality of the solution
(a) .044 atm
(b) .065 atm
(c) 1.50 atm
(d) 0.208 atm
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 happens when blood cells are placed in pure water?
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?
(Kb=5KKgmol-1 )(1m=1M)
1 3.2*10-11
2 3.2*10-10
3 3.2*10-9
4 3.2*10-12
For determining the molecular mass of polymers, osmotic pressure is preferred to other Colligative properties. Why????????
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?
(i)0.5% NaCl solution (ii) 1% NaCl solution ? Explain.
(1) X
(2) X2
(3) X4
(4) X8
Kindly answer sir/mam.
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%
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
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?
(iv) 1.0 M KNO3
how is
m= w2/m2 // w1/1000
?
how did it come?
What is the molecular mass of cane sugar?
Calculate the solubility of carbon dioxide in water at 0 °C and a pressure of 3.00 atm. The solubility of carbon
sodium chloride solution freezes at lower temperature than water but boils at higher temperature than water , explain.
. What type of interactions exists between Cl2 and CCl4
What is the van't Hoff factor for a compound which undergoes tetramerization in an organic solvent ?
1.If we have 10 molal urea solution, calculate the mole fraction of urea and also calculate the w/w % of urea?
An x molal solution of a compound in benzene has a molefraction =0.2.what is the value of x?
in a solvent 50% of benzoic acid dimerises while the rest ionises. determine molar mass of acid which is observed and also its van't hoff factor.
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
? Clean a small piece of scrap aluminium with steel?
wool and cut it into very small pieces. Aluminium?
foil may be taken instead of scrap aluminium.
? Put the small pieces of scrap aluminium or?
aluminium foil(about 1.00g) into a conical flask and?
add about 50 ml of 4 M KOH solution to dissolve?
the aluminium.?
? The flask may be heated gently in order to facilitate?
dissolution. Since during this step hydrogen gas is?
evolved this step must be done in a well ventilated?
area.?
? Continue heating until all of the aluminium reacts.
? Filter the solution to remove any insoluble?
impurities and reduce the volume to about 25 ml by?
heating. ? ? ? ? ? Allow the filtrate to cool. Now add slowly 6 M?
H2SO4 until insoluble Al(OH)3 just forms in the?
solution.
? Gently heat the mixture until the Al(OH)3?
precipitate dissolves.?
? Cool the resulting solution in an ice-bath for about?
30 minutes whereby alum crystals should separate?
out. For better results the solution may be left?
overnight for crystallization to continue.?
? In case crystals do not form the solution may be?
further concentrated and cooled again.
? Filter the crystals from the solution using vacuum
pump, wash the crystals with 50/50 ethanol-water?
mixture. ? Continue applying the vacuum until the crystals?
appear dry.
? Determine the mass of alum crystals. ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?#Respected experts please tell me 1)how shall i make 50 ml of 4M KOH solution ? If i add 11.22 gram of KOH pellets in 50ml of water will it do ? If not please elaborate each step clearly on how i can make it . ? ? ? 2) after filtering the solution of aluminium and koh how am i supposed to reduce it to?25.ml?... am i supposed to reduce it by heating ? ?3) how shall i make 6 M of h2so4 solution .... the procedure doesn't provide me with the amount of solution to be prepared in milli literes . Please tell me how i can make it . ? ? ? Last time i followed this procedure my crystals were not formed . I have to make this investigatory project as soon as possible so please help . My teacher said the koh pellets are very expensive , i have wasted them once and i need them to be perfect this time . Also how long am i supposed to keep the solution fir it to make the crystals ?