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The van't Hoff factor of $CH_3COOH$ is less than unity. It indicates that the acetic acid
jeemain
chemistry
class12
ch2
solutions
q88
colligative-properties
vant-hoff
easy
asked
Feb 14, 2014
by
sreemathi.v
1
answer
The 2.56gm of sulphur in 100gm of $CS_2$ has depression in freezing point of $0.010^{\large\circ}$C. $K_f=0.1^{\large\circ}C$/molal. Hence atomicity of sulphur in $CS_2$
jeemain
chemistry
class12
ch2
solutions
q87
colligative-properties
depression-of-freezing-point
medium
asked
Feb 14, 2014
by
sreemathi.v
1
answer
Which of the following has the maximum osmotic at temperature T?
jeemain
chemistry
class12
ch2
solutions
q86
osmotic-pressure
colligative-properties
easy
asked
Feb 14, 2014
by
sreemathi.v
1
answer
Two identical charged spheres are suspended by strings of equal length . The strings make an angle of $\;60^{0}\;$ with each other . When suspended in a liquid of density $\;0.5 g/cc,\;$ the angle remains the same . The dielectric constant of the liquid is [density of material of sphere is $\;1.5 g/cc\;$]
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
difficult
asked
Feb 14, 2014
by
yamini.v
2
answers
A lens has a power of +5 diopter in air what will be its power if completely immersed in water ? $ \mu_g =\large\frac{3}{2};$$ \mu_w=\large\frac{4}{3}$
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
medium
asked
Feb 14, 2014
by
meena.p
1
answer
Mole fraction of the component 'A' in vapour phase is X and mol fraction of component 'A' in liquid mixture is Y $(P_A^0$=vapour pressure of pure A,$P_A^0$=vapour pressure of pure B) then total vapour of the liquid mixture is
jeemain
chemistry
class12
unit2
solutions
q85
difficult
asked
Feb 14, 2014
by
sreemathi.v
1
answer
pH of a 0.1M monobasic acid is found to be 2.Hence its osmotic pressure at a given temp T is
jeemain
chemistry
class12
unit2
solutions
q84
difficult
asked
Feb 14, 2014
by
sreemathi.v
1
answer
At room temperature $25^{\large\circ}C$,the vapour pressure of pure methyl alcohol is 92 torr.Mol fraction of $CH_3OH$ in a solution in which vapour pressure of $CH_3OH$ is 24 torr at $25^{\large\circ}$ is ?
jeemain
chemistry
class12
unit2
solutions
q83
difficult
asked
Feb 14, 2014
by
sreemathi.v
1
answer
A point source of light is placed at the bottom of a tank containing a liquid $(R.I= \mu)$ upto a depth $h$. A bright circular spot is seen on the surface of the liquid. Then the radius of this bright spot.:
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
total-internal-reflection
difficult
asked
Feb 14, 2014
by
meena.p
1
answer
At room temperature $25^{\large\circ}C$,the vapour pressure of pure methyl alcohol is 90 torr.Mol fraction of $CH_3OH$ in a solution in which vapour pressure of $CH_3OH$ is 20 torr at $25^{\large\circ}$ is ?
jeemain
chemistry
class12
unit2
solutions
q82
difficult
asked
Feb 14, 2014
by
sreemathi.v
1
answer
In the figure shown for an angle of incidence i at the top surface , What is the minimum refractive index needed for total internal reflection at vertical face ?
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
total-internal-reflection
difficult
asked
Feb 14, 2014
by
meena.p
1
answer
Most likely the following mixtures to be an ideal solution is
jeemain
chemistry
class12
unit2
solutions
q81
difficult
asked
Feb 14, 2014
by
sreemathi.v
1
answer
$20 dm^3$ of $SO_2$ diffuses through a porous partition in 60 Seconds. What Volume be $O_2$ will diffuse under similiar conditions in 30 second?
chemistry
jeemain
physical-chemistry
class11
states-of-matter
gas-laws
easy
q30
asked
Feb 14, 2014
by
sharmaaparna1
1
answer
At room temperature $25^{\large\circ}C$,the expression for total pressure of mixture of methanol and ethanol solution is given by P(in torr)$=135+120X$ where $X$ is mol fraction of methanol,Hence
jeemain
chemistry
class12
unit2
solutions
q80
difficult
asked
Feb 14, 2014
by
sreemathi.v
1
answer
A particle of mass m and charge +q is projected from the origin with a speed v at an angle $\;30^{0}\;$ with the horizontal into an electric field of intensity E directed downward . Equation of trajectory of particle is . Neglect gravity
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
difficult
asked
Feb 14, 2014
by
yamini.v
1
answer
A gaseous mixture of $O_2 and N_2$ are in the ratio of 1:4 by weight . Calculate their ratio of molecules.
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
gas-laws
easy
q29
asked
Feb 14, 2014
by
sharmaaparna1
1
answer
Calculate the total pressure in a mixture of 4g $O_2\;and \;2g\;H_2$ confined in a bulb of 1 litre at $0^{\large\circ}C$
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
ideal-gas-equation
easy
q28
asked
Feb 14, 2014
by
sharmaaparna1
1
answer
When mercuric iodide is added to the aqueous solution of potassium iodide,the
jeemain
chemistry
class12
unit2
solutions
q79
difficult
asked
Feb 14, 2014
by
sreemathi.v
3
answers
Mixture of volatile components A and B has total vapour pressure (in torr) P=$250-115X_A$ where $X_A$ is mol fraction of 'A' in mixture.Hence $P_A^0$ and $P_B^0$ respectively are (in torr)
jeemain
chemistry
class12
unit2
solutions
q78
difficult
asked
Feb 14, 2014
by
sreemathi.v
1
answer
Two gases A and B having molecular weights 60 and 45 respectively are enclosed in a vessel . The weight of A is 0.50g and that of B is 0.2g. The total pressure of the mixture is 750mm. Calculate partial pressure of the two gases.
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
ideal-gas-equation
easy
q27
asked
Feb 14, 2014
by
sharmaaparna1
1
answer
Which of the following azeotropic solutions has the boiling point less than the boiling point of the constituents
jeemain
chemistry
class12
unit2
solutions
q77
difficult
asked
Feb 14, 2014
by
sreemathi.v
1
answer
An azeotropic solution of two liquids has a boiling point lower than either of them when it
jeemain
chemistry
class12
unit2
solutions
q76
difficult
asked
Feb 14, 2014
by
sreemathi.v
2
answers
$20\% N_2O_4$ molecules are dissociated in a sample of gas $27^{\large\circ}$ and 760 torr. Calculate the density of the equilibrium mixture.
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
ideal-gas-equation
easy
q26
asked
Feb 14, 2014
by
sharmaaparna1
1
answer
Which is true about enthalpy of solution containing benzene and toluene?
jeemain
chemistry
class12
unit2
solutions
q75
difficult
asked
Feb 14, 2014
by
sreemathi.v
1
answer
The degree of dissociation $'\alpha'$ of a weak electrolyte is (N is number of ions given by 1 mol of the electrolyte)
jeemain
chemistry
class12
unit2
solutions
q74
difficult
asked
Feb 14, 2014
by
sreemathi.v
1
answer
If $10^{-4} dm^3$ of water is introduced into a $1.0dm^3$ flask to 300K. How many moles of water are in the vapour phase when equilibrium is established? (Given Vapour pressure of $H_2O$ at 300K is 3170 Pa ; $R = 8.314JK^{-1}mol^{-1}$
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
liquifaction-of-gases
easy
q25
asked
Feb 14, 2014
by
sharmaaparna1
1
answer
Which of the following has maximum freezing point for 1 molal solution, assuming equal ionisation in each case?
jeemain
chemistry
class12
unit2
solutions
q73
difficult
asked
Feb 14, 2014
by
sreemathi.v
1
answer
The ratio of the rate of diffusion of helium and methane under identical conditions of pressure and temperature is
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
liquifaction-of-gases
easy
q24
asked
Feb 14, 2014
by
sharmaaparna1
1
answer
The root mean square speed of one mole of a monoatomic gas having molecular mass M is $U_{rms}$. The relation between the average kinetic energy (E) of the gas and $U_{rms}$ is:
jeemain
chemistry
physical-chemistry
class11
states-of-matter
kinetic-molecular-theory-of-gases
easy
q23
asked
Feb 14, 2014
by
sharmaaparna1
1
answer
One mole each of the following solutes are taken in 1000g of water
jeemain
chemistry
class12
unit2
solutions
q72
difficult
asked
Feb 14, 2014
by
sreemathi.v
1
answer
Positive deviations from ideal gas behaviour takes place because
jeemain
chemistry
physical-chemistry
class11
states-of-matter
ideal-gas-equation
easy
q22
asked
Feb 14, 2014
by
sharmaaparna1
1
answer
Lowering of vapour pressure due to a solute in 1 molal aqueous solutions at $100^{\large\circ}C$ is
jeemain
chemistry
class12
unit2
solutions
q71
difficult
asked
Feb 14, 2014
by
sreemathi.v
1
answer
A particle of charge -q and mass m moves in a circle of radius r arround an infinitely long line charge of linear density $\;+\lambda\;$ . Then time period will be
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
continuous-charge-distribution
difficult
asked
Feb 14, 2014
by
yamini.v
1
answer
When the temperature is increased surface tension of water
jeemain
chemistry
physical-chemistry
class11
states-of-matter
liquid-state
easy
q21
asked
Feb 14, 2014
by
sharmaaparna1
1
answer
Match the column-I with column-II ,which are true for 20% w/w aqueous KI solution (density of KI solution is 1.20g/ml & M.wt of KI is 166 g/mol)
jeemain
chemistry
class12
unit2
solutions
q70
medium
asked
Feb 14, 2014
by
sreemathi.v
1
answer
Three concentric spherical metallic shells A , B and C of radii a , b and c $\;(a < b < c)\;$ have charge densities $\;\sigma , - \sigma \; and \; \sigma\;$ respectively . If the shells A and C are at the same potential then the relation between a , b and c is
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
difficult
asked
Feb 14, 2014
by
yamini.v
1
answer
Match the column-I and column-II
jeemain
chemistry
class12
unit2
solutions
q69
medium
asked
Feb 14, 2014
by
sreemathi.v
1
answer
Which is true about ideal solutions?
jeemain
chemistry
class12
unit2
solutions
q68
medium
asked
Feb 14, 2014
by
sreemathi.v
1
answer
Total vapour pressure of mixture of 1 mole $X(P_x^0=150torr)$ and 2 mol Y$(P_y^0=240torr)$ is 210mm.In this case
jeemain
chemistry
class12
unit2
solutions
q67
medium
asked
Feb 14, 2014
by
sreemathi.v
1
answer
Mole fraction of the benzene in the vapour phase which is in equilibrium with a solution of benzene $(p^0=120torr)$ and toluene$(p^0=80torr)$ having 4.0mole of benzene and 6 mole of toluene in solution.
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
composition-of-a-solution
medium
asked
Feb 14, 2014
by
sreemathi.v
1
answer
A 10.0 Kg block carrying a charge 100 $\;\mu C\;$ is connected to a spring for which $\;K=100 N/m\;$ . The block lies on a frictionless horizontal track , and the system is immersed in a uniform electric field $\;E=5\times10^{5}\;V/m\;$ , directed as shown in figure . If the block is released from rest when the spring is amount does the spring expand
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
difficult
asked
Feb 14, 2014
by
yamini.v
1
answer
Mole fraction of the benzene in the vapour phase which is in equilibrium with a solution of benzene $(p^0=120torr)$ and toluene$(p^0=80torr)$ having 2.0mole of each is
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
composition-of-a-solution
medium
asked
Feb 14, 2014
by
sreemathi.v
1
answer
Mole fraction of the toluene in the vapour phase which is in equilibrium with a solution of benzene $(p^0=120torr)$ and toluene$(p^0=80torr)$ having 2.0mole of each is
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
composition-of-a-solution
medium
asked
Feb 14, 2014
by
sreemathi.v
1
answer
A point charge q is placed on the top of a cone of serni-vertex angle $\;\theta\; $ Find the electric flux through the base of the cone
jeemain
physics
class12
electric-charges-and-fields
electrostatics
gausss-law
difficult
asked
Feb 14, 2014
by
yamini.v
1
answer
The current in the primary circuit of a potentiometer is $0.2 A$. The specific resistance and cross-section of the potentiometer wire are $4 \times 10^{-7} ohm $ meter and $8 \times 10^{-7} \: m^2$ respectively. The potential gradient will be equal to:
jeemain
physics
current-electricity
cbse
class12
ch5
meter-bridge-potentiometer-and-instrumentation
easy
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
If $400ohms $ of resistance is made by adding four $ 100 \: ohm $ resistances of tolerance 5%, then the tolerance of the combination is:
jeemain
physics
current-electricity
cbse
class12
ch5
electric-current-concepts
easy
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
Time constant of a $RC$ circuit is $2/ln(2) s$. Capacitor is discharged at time $ t = 0$. The ratio of charge on the capacitor at time $t = 2s$ and $t = 6s$ is
jeemain
physics
electromagnetic-induction
cbse
class12
ch3
q98
easy
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
The potential difference across the terminals of the battery (with $2\;ohms$ internal resistance) is
jeemain
physics
current-electricity
cbse
class12
ch5
electric-current-concepts
easy
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
The current passing through the $ 3\Omega$ resistor is
jeemain
physics
current-electricity
cbse
class12
ch5
electric-current-concepts
easy
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
Under what conditions, can the current passing through the resistance R be increased? r1 and r2 are the internal resistances of the two batteries.
jeemain
physics
current-electricity
cbse
class12
ch3
cells-emf-and-internal-resistance
medium
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
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