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Recent questions tagged chemistry
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To $500cm^3$ of water $3.0\times 10^{-3}$kg of acetic acid is added .If 2.3% of acetic acid is dissociated.What will be the depression of freezing point?$K_f$ and density of water are $1.86$K kg/mol and $0.997g/cm^3$ respectively.
cbse
class12
chemistry
ch2
solutions
sec-c
medium
additionalproblem
q12
asked
Aug 6, 2014
by
sreemathi.v
1
answer
When mercuric iodide is added to an aqueous solution of potassium iodide, the
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
elevation-of-boiling- point
colligative-properties
elevation-of-boiling-point
medium
asked
Aug 6, 2014
by
meena.p
1
answer
The freezing point of a solution containing 0.2g of acetic acid in 20.0g benzene is lowered by $0.45^{\large\circ}$C.Calculate the degree of association of acetic acid in benzene.Assume acetic acid dimerises in benzene.$K_f$ for benzene =$5.12Kmol^{-1}Kg$
cbse
class12
chemistry
ch2
solutions
sec-b
medium
additionalproblem
q11
asked
Aug 6, 2014
by
sreemathi.v
1
answer
The elevation of boiling point of water produced by dissolving $1.17 g$ sodium chloride in $100 g$ water $K_b=0.512\;K\;kg\;mol^{-1})$ is
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
elevation-of-boiling- point
colligative-properties
elevation-of-boiling-point
medium
asked
Aug 6, 2014
by
meena.p
1
answer
If boiling point of an aqueous solution is 100.1$^{\large\circ}C$,what is its freezing point.Given,latent heat of fusion and vaporization of water as $80cal g^{-1}$ and $540cal g^{-1}$ respectively.
cbse
class12
chemistry
ch2
solutions
sec-b
medium
additionalproblem
q10
asked
Aug 6, 2014
by
sreemathi.v
1
answer
The boiling point of water at $735$Torr is $99.07^{\circ}C$ . The mass of $NaCl$ added in $100\;g$ water $(K_b=0.51\;K\;kg\;mol^{-1})$ to make its boiling point $100^{\circ}C$ is
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
elevation-of-boiling- point
colligative-properties
elevation-of-boiling-point
medium
asked
Aug 6, 2014
by
meena.p
1
answer
For an ideal solution containing a nonvolatile solute, Which of the following expression is correctly represented ?
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
elevation-of-boiling- point
colligative-properties
elevation-of-boiling-point
easy
asked
Aug 6, 2014
by
meena.p
1
answer
A very small amount of a non-volatile solute (that does not dissociate) is dissolved in $56.8cm^3$ of benzene (density $=0.889gcm^{-3}$).At room temperature vapour pressure of this solution is 98.88mm Hg while that of benzene is 100 mm Hg.Find the molality of this solution.If the freezing temperature of this solution is 0.73 degree lower than that of benzene .What is the value of $K_f$ for benzene?
cbse
class12
chemistry
ch2
solutions
sec-b
medium
additionalproblem
q9
asked
Aug 6, 2014
by
sreemathi.v
1
answer
Which of the following solvents has the largest value of $K_f$?
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
freezing-point
colligative-properties
depression-of-freezing-point
medium
asked
Aug 6, 2014
by
meena.p
1
answer
The molar mass and the freezing point of camphor are $152.2\;g\;mol^{-1} $ and $178.4^{\circ} C $ respectively . The cryoscopic constant of camphor is $ 37.7\;K\;kg\;mol^{-1}$, the molar enthalpy of fusion of camphor is about
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
freezing-point
colligative-properties
depression-of-freezing-point
medium
asked
Aug 6, 2014
by
meena.p
1
answer
Find the molality of a solution containing a non-volatile solute if the vapour pressure is 2% below the vapour pressure of pure water.
cbse
class12
chemistry
ch2
solutions
sec-b
medium
additionalproblem
q8
asked
Aug 6, 2014
by
sreemathi.v
1
answer
A 5% solution (wt/volume) of cane sugar is isotonic with 0.877% (wt/volume) of urea solution.Find the molecular weight of urea,if molecular weight of sugar is 342.
cbse
class12
chemistry
ch2
solutions
sec-b
easy
additionalproblem
q7
asked
Aug 6, 2014
by
sreemathi.v
1
answer
The Henry's law constant for oxygen dissolved in water is $4.34\times 10^4$ atm at $25^{\large\circ}$C.If the partial pressure of oxygen in air is 0.2atm,under atmospheric conditions,calculate the concentration (in moles per litre) of dissolve oxygen in water in equilibrium with air at $25^{\large\circ}$C.
cbse
class12
chemistry
ch2
solutions
sec-c
easy
additionalproblem
q6
asked
Aug 6, 2014
by
sreemathi.v
1
answer
The solubility of oxygen in water is $2.43\times 10^{-3}$ mole/litre at $25^{\large\circ}$C and 1.0atm pressure.Calculate the concentration of oxygen at $25^{\large\circ}$C and 0.2atm pressure.
cbse
class12
chemistry
ch2
solutions
sec-b
medium
additionalproblem
q5
asked
Aug 6, 2014
by
sreemathi.v
1
answer
Calculate the molarity of water if its density is $1000g/m^3$
cbse
class12
chemistry
ch2
solutions
sec-a
easy
additionalproblem
q4
asked
Aug 6, 2014
by
sreemathi.v
1
answer
A sample of sulphuric acid is 98% $H_2SO_4$ by weight (density =$1.10gmL^{-1})$.Calculate normality
cbse
class12
chemistry
ch2
solutions
sec-b
medium
additionalproblem
q3-ii
asked
Aug 6, 2014
by
sreemathi.v
1
answer
If the freezing point depression constant of a solvent is $20.0\;K\;kg\;mol^{-1}$. If its $\Delta_{fus} H^0_m=2.74\;kJ\;mol^{-1}$ and its molar mass is $84.2\;g\;mol^{-1}$ the normal freezing point of the solvent would be about
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
freezing-point
colligative-properties
depression-of-freezing-point
medium
asked
Aug 6, 2014
by
meena.p
1
answer
A sample of sulphuric acid is 98% $H_2SO_4$ by weight (density =$1.10gmL^{-1})$.Calculate Molarity
cbse
class12
chemistry
ch2
solutions
sec-b
medium
additionalproblem
q3-i
asked
Aug 6, 2014
by
sreemathi.v
1
answer
For water , $ \Delta _{fus} H^3_m=2.74 \;kJ\;mol^{-1}$ and its molar mass is $ 84.2\;g \;mol^{-1} $ the normal freezing point depression constant at 1 atm pressure would be about
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
freezing-point
colligative-properties
depression-of-freezing-point
medium
asked
Aug 6, 2014
by
meena.p
1
answer
1.8g of glucose (molar mass =180) are dissolved in 60g of water.Calculate the mole fraction of glucose and water
cbse
class12
chemistry
ch2
solutions
sec-a
easy
additionalproblem
q2-b
asked
Aug 6, 2014
by
sreemathi.v
1
answer
1.8g of glucose (molar mass =180) are dissolved in 60g of water.Calculate the molality
cbse
class12
chemistry
ch2
solutions
sec-a
easy
additionalproblem
q2-a
asked
Aug 6, 2014
by
sreemathi.v
1
answer
1.23g of sodium hydroxide (molar mass =40) are dissolved in water and the solution is made to $100cm^3$.Calculate the molarity of solution.
cbse
class12
chemistry
ch2
solutions
sec-b
medium
additionalproblem
q1
asked
Aug 6, 2014
by
sreemathi.v
1
answer
When $20\;g$ of naphthoic acid $(C_{11}H_gO_2)$ is dissolved in $50 \;g$ of benzene $(K_t =1.72\;K\;kg\;mol^{-1}).$, a freezing point depression of $2 K$ is observe. The van't Hoff factor (i) is
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
freezing-point
colligative-properties
depression-of-freezing-point
medium
asked
Aug 6, 2014
by
meena.p
1
answer
Determine the osmotic pressure of a solution prepared by dissolving 25 mg of $K_2SO_4$ in 2 litre of water at 25$^{\large\circ}$ C, assuming that it is completely dissociated.
cbse
class12
chemistry
ch2
solutions
sec-b
medium
bookproblem
q2.41
asked
Aug 6, 2014
by
sreemathi.v
1
answer
The unit of freezing point depression constant is
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
freezing-point
colligative-properties
depression-of-freezing-point
medium
asked
Aug 6, 2014
by
meena.p
1
answer
The freezing point of a $0.05$ molal solution of a nonelectrolyte in water is
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
freezing-point
colligative-properties
depression-of-freezing-point
medium
asked
Aug 6, 2014
by
meena.p
1
answer
Determine the amount of $CaCl_2$ (i = 2.47) dissolved in 2.5 litre of water such that its osmotic pressure is 0.75 atm at 27$^{\large\circ}$ C.
cbse
class12
chemistry
ch2
solutions
sec-b
medium
bookproblem
q2.40
asked
Aug 6, 2014
by
sreemathi.v
1
answer
The molar mass of acetic acid dissolved in benzene determined from the depression in freezing point is found to be
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
freezing-point
colligative-properties
depression-of-freezing-point
medium
asked
Aug 6, 2014
by
meena.p
1
answer
The freezing point of equimolal solution will be lowest for
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
freezing-point
colligative-properties
depression-of-freezing-point
difficult
asked
Aug 6, 2014
by
meena.p
1
answer
Which of the following exhibits the greater freezing - point lowering ?
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
freezing-point
colligative-properties
depression-of-freezing-point
difficult
asked
Aug 6, 2014
by
meena.p
1
answer
The air is a mixture of a number of gases. The major components are oxygen and nitrogen with approximate proportion of 20% is to 79% by volume at 298 K. The water is in equilibrium with air at a pressure of 10 atm. At 298 K if the Henry’s law constants for oxygen and nitrogen at 298 K are $3.30 \times 10^7$ mm and $6.51 \times 10^7$ mm respectively, calculate the composition of these gases in water.
cbse
class12
chemistry
ch2
solutions
sec-c
easy
bookproblem
q2.39
asked
Aug 6, 2014
by
sreemathi.v
1
answer
When a sugar- solution is slowly frozen, the first solid which separates out is
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
freezing-point
colligative-properties
depression-of-freezing-point
difficult
asked
Aug 6, 2014
by
meena.p
1
answer
Benzene and toluene form ideal solution over the entire range of composition. The vapour pressure of pure benzene and toluene at 300 K are 50.71 mm Hg and 32.06 mm Hg respectively. Calculate the mole fraction of benzene in vapour phase if 80 g of benzene is mixed with 100 g of toluene.
cbse
class12
chemistry
ch2
solutions
sec-c
medium
bookproblem
q2.38
asked
Aug 6, 2014
by
sreemathi.v
1
answer
Vapour pressures of pure acetone and chloroform at 328 K are 741.8 mm Hg and 632.8 mm Hg respectively. Assuming that they form ideal solution over the entire range of composition, plot $p_{total}, p_{chloroform}$, and $p_{acetone}$ as a function of $x_{acetone}$. The experimental data observed for different compositions of mixture is:
cbse
class12
chemistry
ch2
solutions
sec-b
medium
bookproblem
q2.37
asked
Aug 6, 2014
by
sreemathi.v
1
answer
100 g of liquid A (molar mass $140 g mol^{–1}$) was dissolved in 1000 g of liquid B (molar mass $180 g mol^{–1}$). The vapour pressure of pure liquid B was found to be 500 torr. Calculate the vapour pressure of pure liquid A and its vapour pressure in the solution if the total vapour pressure of the solution is 475 torr.
cbse
class12
chemistry
ch2
solutions
sec-c
medium
bookproblem
q2.36
asked
Aug 6, 2014
by
sreemathi.v
1
answer
Henry’s law constant for the molality of methane in benzene at 298 K is $4.27 \times 10^5$ mm Hg. Calculate the solubility of methane in benzene at 298 K under 760 mm Hg.
cbse
class12
chemistry
ch2
solutions
sec-a
easy
bookproblem
q2.35
asked
Aug 6, 2014
by
sreemathi.v
1
answer
Pure Benzene freezes at $5.4 ^{\circ}\;C$. A solution of $0.223 \;g$ of phenyl acetic acid $(C_6 H_5 CH_2 COOH)$ in $4.4\;g$ benzene $(K_f =5.12 K\; Kg\;mol^{-1}) $ freezes at $4.47 ^{\circ}$ . From this observation , one can conclude that
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
freezing-point
colligative-properties
depression-of-freezing-point
difficult
asked
Aug 5, 2014
by
meena.p
1
answer
Assuming $ 100\%$ ionization , the increasing order of the freezing point of the solution will be
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
freezing-point
colligative-properties
depression-of-freezing-point
easy
asked
Aug 5, 2014
by
meena.p
1
answer
A solution contains $0.1 \; mol$ of acetamide in 1L of glacial acetic acid . When the solution is cooled , the first crystals that appeared at the freezing point contain the molecules of
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
freezing-point
colligative-properties
depression-of-freezing-point
easy
asked
Aug 5, 2014
by
meena.p
1
answer
For an ideal solution containing a nonvolatile solute, Which of the following expression is correctly represented?
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
freezing-point
colligative-properties
depression-of-freezing-point
easy
asked
Aug 5, 2014
by
meena.p
1
answer
The freezing point of equimolal aqueous solution will be highest for
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
freezing-point
colligative-properties
depression-of-freezing-point
easy
asked
Aug 5, 2014
by
meena.p
1
answer
Vapour pressure of water at 293 K is 17.535 mm Hg. Calculate the vapour pressure of water at 293 K when 25 g of glucose is dissolved in 450 g of water.
cbse
class12
chemistry
ch2
solutions
sec-c
easy
bookproblem
q2.34
asked
Aug 5, 2014
by
sreemathi.v
1
answer
Which of the following $0.1 \;M$ aqueous solution will have the lowest freezing point ?
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
freezing-point
colligative-properties
depression-of-freezing-point
easy
asked
Aug 5, 2014
by
meena.p
1
answer
When mercuric iodide is added to an aqueous solution of potassium iodide the
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
freezing-point
colligative-properties
depression-of-freezing-point
medium
asked
Aug 5, 2014
by
meena.p
1
answer
$5 g$ of a nonvolatile compound (molar mass $50\; g \;mol^{-1}$) is added to 100 g of water . If the decrease of pressure is $11.31$ Torr, the vapour pressure of water will be
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
vapour-pressure
colligative-properties
lowering-vapour-pressure
medium
asked
Aug 5, 2014
by
meena.p
1
answer
19.5 g of $CH_2FCOOH$ is dissolved in 500 g of water. The depression in the freezing point of water observed is 1.00$^{\large\circ}$ C. Calculate the van’t Hoff factor and dissociation constant of fluoroacetic acid.
cbse
class12
chemistry
ch2
solutions
sec-c
medium
bookproblem
q2.33
asked
Aug 5, 2014
by
sreemathi.v
1
answer
Calculate the depression in the freezing point of water when 10 g of $CH_3CH_2CHClCOOH$ is added to 250 g of water. $K_a = 1.4 \times 10^{–3}, K_f = 1.86 K kg mol^{–1}$.
cbse
class12
chemistry
ch2
solutions
sec-c
easy
bookproblem
q2.32
asked
Aug 5, 2014
by
sreemathi.v
1
answer
The vapour pressure of a solvent is found to be $400 mm$ Hg at $300 K$ When a certain amount of nonvolatile solute added to $50\;mol$ of the solvent its vapour pressure decreases to $360\;mm Hg$. The amount of solute added is:
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
vapour-pressure
colligative-properties
lowering-vapour-pressure
medium
asked
Aug 5, 2014
by
meena.p
1
answer
The depression in freezing point of water observed for the same amount of acetic acid, trichloroacetic acid and trifluoroacetic acid increases in the order given above. Explain briefly.
cbse
class12
chemistry
ch2
solutions
sec-b
easy
bookproblem
q2.31
asked
Aug 5, 2014
by
sreemathi.v
1
answer
Calculate the amount of benzoic acid $(C_6H_5COOH)$ required for preparing 250 mL of 0.15 M solution in methanol.
cbse
class12
chemistry
ch2
solutions
sec-b
medium
bookproblem
q2.30
asked
Aug 5, 2014
by
sreemathi.v
1
answer
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