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CBSE - XII Science - Chemistry - Solutions
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Asked by chetanrakshit06
5th May 2024,
2:51 PM
CBSE - XII Science - Chemistry - Solutions
The boiling point of benzene is 353.23k. When 1.80g of a non-volatile solute was dissolved in 90g of benzene , the boiling is raised to 345.11k. Calculate the molar mass of solute (kb=2.53kg mol-1)
Asked by varinder2149
10th December 2023,
8:21 PM
CBSE - XII Science - Chemistry - Solutions
Molal elevation constant for benzene is 2.5K/m. A solution of some organic substance in benzene boils at 0.126°C higher than benzene. What is the molality of solution?
Asked by goyalpavitarta
3rd May 2021,
1:27 PM
CBSE - XII Science - Chemistry - Solutions
Boiling point of water at 750mm of hg is 99.63°C. how much sucrose is to be added to 500g of water such that it boils at 100°C.
Asked by goyalpavitarta
3rd May 2021,
1:25 PM
CBSE - XII Science - Chemistry - Solutions
2.00g of non-electolyte solute dissolved in 100g of benzene, lowered the freezing point of benzene by 0.30K. find the molar mass of solute.
Asked by goyalpavitarta
3rd May 2021,
1:20 PM
CBSE - XII Science - Chemistry - Solutions
What is colligative property
Asked by sshashu993
25th July 2020,
8:02 AM
CBSE - XII Science - Chemistry - Solutions
Explain B.pt.elevation and F.pt.depression?
Asked by anukritisingh8103.bmps
15th July 2020,
5:52 PM
CBSE - XII Science - Chemistry - Solutions
To 500 cm3of water ,3×10^-3 of acetic acid is added .if 23 percent is dissociated what will be the depression in freezing pt given k1 is 1.86K kg /mol
Asked by sharmasherryal
25th May 2020,
9:54 AM
CBSE - XII Science - Chemistry - Solutions
two liquids a and b at 120C and 160C which of these liquids has at higher vapour pressure at 90C
Asked by panthpreet0221
6th May 2020,
10:41 AM
CBSE - XII Science - Chemistry - Solutions
calculate freezing point of a solution when 54g of glucose is dissolved in 250g of water
Asked by anamikadas355
14th February 2020,
11:28 AM
CBSE - XII Science - Chemistry - Solutions
Calculate the amount of CaCl2, which must be added to 2 kg water so that the freezing point is depressed by 61 K (Kf of H2O =1.86 K kg mol^-1, Atomic mass of Ca = 40, Cl = 35.5)
Asked by jusu20111
26th January 2020,
1:15 PM
CBSE - XII Science - Chemistry - Solutions
please answer this
Asked by Prashant DIGHE
5th January 2020,
9:20 PM
CBSE - XII Science - Chemistry - Solutions
12gram glucose ko 10 gm solution Ka kwathnank 100.34 c hai,molal unnayan sthirank batao
Asked by mishrasatyamcs12
17th September 2019,
3:15 AM
CBSE - XII Science - Chemistry - Solutions
Calculate freezing point lowering of a 5% solution of glucose in water
Asked by ddeeru333
17th July 2019,
7:47 PM
CBSE - XII Science - Chemistry - Solutions
Depression in freezing point is 6 K for NaCl solution if kf for water is 1.86 K/kg mol, amount of NaCl dissolved in 1 kg water is (a)3.42 (b)1.62 (c)3.24 (d)1.71
Asked by Balbir
17th July 2019,
4:43 PM
CBSE - XII Science - Chemistry - Solutions
Why ice cream seller add salt to ice around cones and not ice alon why ? I have searched a lot about the reason but I can't understand any reason? Why adding of salt makes water colder
Asked by govtsecschoolnayaganv051
12th June 2019,
11:01 AM
CBSE - XII Science - Chemistry - Solutions
Calculate the boiling point of a solution containing 0.45g of camphor (mol. wt. 152) dissolved in 35.4g of acetone (b.p. 56.3°C); Kb per 100 gm of acetone is 17.2°C. IN THIS QUESTION WE USE THE FORMULA = 100 Kb *w2/w1M2 I want to know how we derive this formula in which 100 is in numerator and not 1000 . I know Kb is per 100 g though I am not able to derive this relation
Asked by govtsecschoolnayaganv051
11th June 2019,
1:38 PM
CBSE - XII Science - Chemistry - Solutions
Please explain the paragraph given in pic How 100 is written in numerator
Asked by govtsecschoolnayaganv051
10th June 2019,
8:44 PM
CBSE - XII Science - Chemistry - Solutions
Please explain that what does it mean in the paragraph in the pic given and also explain that what it means that " the solution boils at a constant temperature and composition remains same"
Asked by govtsecschoolnayaganv051
20th May 2019,
1:57 PM
CBSE - XII Science - Chemistry - Solutions
when0.5g Nacl present in 1000g of water then calculate the freezing point of solution ? kf= 1.7k kg /mol
Asked by lakashitaparihar801
30th April 2019,
4:31 PM
CBSE - XII Science - Chemistry - Solutions
1.00 g of a non-electrolyte solute dissolved in 50 g of benzene lowered the freezing point of benzene by 0.40K. The freezing point depression constant of benzene is 5.12 K kg/mol. Find the molar mass of the solute
Asked by rockdeva663
17th April 2019,
9:58 AM
CBSE - XII Science - Chemistry - Solutions
18g glucose is added to 178.2g water the vapour pressure of water for this aqueous solution at 100calsias is
Asked by araj02582
8th April 2019,
12:56 PM
CBSE - XII Science - Chemistry - Solutions
HI SIR GOOD MORNING....SIR I HAVE A DOUBT IN ELEVATION OF BOILING POINT.....
Asked by sinkudad9
5th October 2018,
7:57 AM
CBSE - XII Science - Chemistry - Solutions
The mole fractions of two components X and Y were found to be same in a binary solution. Will their mole fractions in vapour phase be the same or different?
Asked by lekhakarthikeyan
27th August 2018,
1:05 PM
CBSE - XII Science - Chemistry - Solutions
How many grams of KCL should be added to 1 kg of water to lower its boiling point to -8 degree celsius(kf of water=1.86)?
Asked by lekhakarthikeyan
25th August 2018,
9:04 PM
CBSE - XII Science - Chemistry - Solutions
Density of 1M of a non-electrolyte aqueous solute of molecular weight 100 is 2 g/mL. If Kf(H2O) is 1.86°C kg mol–1, then solution will freeze at
Asked by Yogesh
5th August 2018,
12:11 PM
CBSE - XII Science - Chemistry - Solutions
Calculate molal elevation constant of water given that 0•1molal aq solution of a substance boiled at 100•052°C
Asked by Ut9827893119
8th June 2018,
9:06 AM
CBSE - XII Science - Chemistry - Solutions
How COLLIGATIVE PROPERTIES are useful in measuring molecular weight ?
Asked by pardeepkumar2281
15th May 2018,
12:14 AM
CBSE - XII Science - Chemistry - Solutions
A SOLUTION OF 1.25g OF NON ELECTROLYTE IN 20g OF WATERFREEZESAT 271.94K.IF Kf=1.86 THEN MOLECULAR WEIGHT OF SOLUTION WILL BE..?????
Asked by aks51114vvit
16th April 2018,
11:37 PM
CBSE - XII Science - Chemistry - Solutions
Calculate the freezing point of a solution containing 60 g of glucose (Molar mass = 180g mol-1) in 250 g of water. (Kf of water = 1.86 K kg mol-1)
Asked by raul.chintakindi14
14th March 2018,
11:44 AM
CBSE - XII Science - Chemistry - Solutions
Please give answer of the following
Asked by Balbir
5th January 2018,
11:39 AM
CBSE - XII Science - Chemistry - Solutions
A solution X is prepared by mixing ethanol and water. The mole fraction of ethanol in the mixture is 0.8, then depression in freezing point of solution X is. ( Kf water = 1.86 and Kf ethanol = 2.0 )
1. 4.34 K
2. 10.86 K
3. 5.434 K
4. 1.35 K
Asked by rajeshtitu
17th July 2016,
8:53 PM
CBSE - XII Science - Chemistry - Solutions
find how many grams of KCL should be added to 1 kg of water to lower its freezing point to -8 degree celsius( kf =1.86 K Kg/ mol) pls explain each and every step
Asked by ppratim02
10th July 2016,
7:27 PM
CBSE - XII Science - Chemistry - Solutions
what would be the freezing point of aq. sol. containg 17 g of C2H5OH in 1000g of water Kf=1.86Kmolality^-
Asked by sarvaterahul
1st July 2016,
10:48 AM
CBSE - XII Science - Chemistry - Solutions
Q. the molal freezing point constant of watr is 1.86 K molality ^-1 if 342 g of can sugar (C6H22O11) are dissolved in 1000g water the solution will freezze at
Q. molal depression of freezing point of water is 1.86 degree per 1000g water . 0002 mole of urea dissolved in 100g of water will produce a lowering of temp. of
Asked by sarvaterahul
1st July 2016,
8:36 AM
CBSE - XII Science - Chemistry - Solutions
the freezing pointof a 0.05 molal solution of a non electrolyte in water is
Asked by sarvaterahul
1st July 2016,
8:25 AM
CBSE - XII Science - Chemistry - Solutions
Calculate the temperature at which a solution containing 54 g of glucose, (C6 H12 O6), in 250 g of water will freeze. (Kf for water = 1.86 K mol-1 kg)
Asked by Topperlearning User
20th June 2016,
3:47 PM
CBSE - XII Science - Chemistry - Solutions
What is molal elevation constant? What are its units?
Asked by Topperlearning User
20th June 2016,
3:47 PM
CBSE - XII Science - Chemistry - Solutions
Plz explain me in detail how with addition of a non-volatile solute depression in freezing point occurs alongwith its graph. plz explain this using concept of variation in vapour pressure and temperature.
Asked by upmaniousagarika
8th May 2016,
12:38 AM
CBSE - XII Science - Chemistry - Solutions
pls sir explain OSTWALD WALKER DYNAMIC METHOD in details?
Asked by ayushi
30th April 2016,
12:58 PM
CBSE - XII Science - Chemistry - Solutions
show that relative lowering of vapour pressure is a colligative property.( for 3 marks)
Asked by Manisha Marwaha
15th February 2016,
7:29 AM
CBSE - XII Science - Chemistry - Solutions
What is the mass of iodine to be dissolved in 100g of benzene to obtain a solution that freezes at 2.94 degree C ? Freezing point of benzene is 5.5 degree C and Kf=5.12Km-1
Asked by Pratik
10th October 2015,
12:14 PM
CBSE - XII Science - Chemistry - Solutions
the molar volume of liquid benzene(density=0.867gm/ml)increased by a factor of 2750 at 20 degree celsius and that of liquid toluene(density=0.867gm/ml)increases by a factor of 7720 at 20 degree celsius . a solution of benzene and toluene at 20 degree celsius has a vapour pressure of 46 torr . find the mole fraction of benzene in the vapour above the solution.
Asked by vt6722
26th July 2015,
1:32 PM
CBSE - XII Science - Chemistry - Solutions
100g of a non-electrolyte solute is dissolved is 50g of benzene lowers the freezing point of benzene by 0.4K. find the molar mass of solute. Kf for benzene is 5.12Kkg/mol.
100g of a non-electrolyte solute is dissolved is 50g of benzene lowers the freezing point of benzene by 0.4K. find the molar mass of solute. Kf for benzene is 5.12Kkg/mol.
Asked by Dave Agresha
20th July 2015,
8:45 AM
CBSE - XII Science - Chemistry - Solutions
the vapour pressure of pure benzene at a certain temperature is 640mmhg a non volatile solute of mass 2.175*10-3 kg is added to 39.0*10-3 kg of benzene . the vapour pressure of the solution is 600mmhg.whatis the molar mass of the solute?
Asked by maitridesai429
2nd March 2015,
1:05 PM
CBSE - XII Science - Chemistry - Solutions
Molal enthalpy of fusion of water at 273 K is 6.02.Calculate molal depression constant of wat.er
Asked by Akshya Achu
1st July 2014,
9:13 PM
CBSE - XII Science - Chemistry - Solutions
A solution prepared by dissolving 1.25 g of oil of winter green (methyl salicylate) in 99.0 g of benzene has a boiling point of 80.310C and Kb for benzene = 2.530C kg mol-1. Calculate the molar mass of solute.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Chemistry - Solutions
A solution prepared by dissolving 1.25 g of oil of winter green (methyl salicylate) in 99.0 g of benzene has a boiling point of 80.310C and Kb for benzene = 2.530C kg mol-1.Calculate the molar mass of winter green?
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Chemistry - Solutions
An aqueous solution contains 5% by mass of urea and 10% by mass of glucose. If molal depression constant of water is 1.86 K kg mol -1. Calculate freezing point of solution.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Chemistry - Solutions
A 5% aqueous solution of cane sugar has a freezing point of 271K. Calculate freezing point of 5 % aqueous solution of glucose. The freezing point of pure water is 273.15K.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Chemistry - Solutions
The freezing depression of 0.1M sodium chloride solution is nearly twice that of 0.1 M glucose solution. Explain?
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Chemistry - Solutions
Dissolution of 10 g of a non-volatile solute in 100g of benzene raises its boiling point by 1oC. Calculate the molar mass of solute. (Kb for benzene 2.53 Km-1)
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Chemistry - Solutions
The boiling point of pure water is 373K. Calculate the boiling point of an aqueous solution containing 18g of glucose in 100g of water. Molal elevation constant of water is 0.52 K.kg mol-1.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Chemistry - Solutions
The boiling point of a solution of 0.105 g of a substance in 15.84 g of ether was found to be 0.1000C higher than that of pure ether. What is the molecular mass of the substance? (Molal elevation constant for ether per 100g is 21.6)
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Chemistry - Solutions
The depression in freezing point is a colligative property. Explain.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Chemistry - Solutions
The boiling points of 0.05 m NaCl and 0.05 m BaCl2 will be same or different?
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Chemistry - Solutions
Give one practical application of depression of freezing point in automobiles?
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Chemistry - Solutions
sir please give all steps for doing numericals on these topics .please sir give examples and formula"s on this topics ...and steps of doing numericals ..
Asked by Hemandra Singh
19th May 2014,
4:51 PM
CBSE - XII Science - Chemistry - Solutions
a metal M 96 g/mol reacts with fluorine to form MFx.in order to determine x a 9.18 grams of a sample ofa salt is dissolved in 100 grams of water and its boiling point was determined to be 374.38k .what is the chemical formula of the salt assuming complete dissociation .Kb =.529(x=4)
Asked by PratibhaPandey
19th May 2014,
3:04 PM
CBSE - XII Science - Chemistry - Solutions
A and B liquids on mixing produved warm solution.which type of deviation is there and why?
Asked by
29th February 2008,
8:19 AM
