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JEEMAIN and NEET
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At $100^{\large\circ}C$ and 1 atm , if the density of liquid water is 1.0g $cm^{-3}$ and that of water vapour is $0.0006gcm^{-3}$ , then the volume occupied by water molecules in 1 litre of stream at that temperature is :
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
liquifaction-of-gases
easy
q19
asked
Feb 13, 2014
by
sharmaaparna1
1
answer
Current in the $3\: ohm$ resistor is
jeemain
physics
current-electricity
cbse
class12
ch5
kirchoffs-law
medium
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
The equivalent resistance between the points A and B is:
jeemain
physics
current-electricity
cbse
class12
ch5
equivalent-resistance
difficult
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
A 5.0 molal aqueous solution of methyl alcohol,$CH_3OH$ is supplied.What is the mole fraction of methyl alcohol in the solution?
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
composition-of-a-solution
easy
asked
Feb 13, 2014
by
sreemathi.v
1
answer
The rms velocity of hydrogen is $\sqrt7$ times the rms velocity of nitrogen. If T is the temperature of the gas, then
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
liquid-state
easy
q18
asked
Feb 13, 2014
by
sharmaaparna1
1
answer
Ethylene glycol is used as an antifreeze in a cold climate.How much mass of ethylene glycol should be added to $5\;kg$ of water to prevent it form freezing at -$6^{\large\circ}C$ will be : $(K_t$ for water =$1.86Kkg mol^{-1}$ and molar mass of ethylene glycol=$62g mol^{-1})$
colligative-properties
depression-of-freezing-point
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
medium
asked
Feb 13, 2014
by
sreemathi.v
1
answer
The compressibility of gas is less than unity at S.T.P .Therefore
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
ideal-gas-equation
easy
q17
asked
Feb 13, 2014
by
sharmaaparna1
1
answer
A gas will approach ideal behaviour at :
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
gas-laws
easy
q16
asked
Feb 13, 2014
by
sharmaaparna1
1
answer
On mixing ,heptane and octane form an ideal solution.At 373K,the vapour pressures of the two liquid components (heptane and octane) are 105kPa and 45kPa respectively.Vapour pressure of the solution obtained by mixing 25g of heptane and 35g of octane will be (molar mass of heptane=100g $mol^{-1}$ and octane=114g$mol^{-1}$)
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
colligative-properties
lowering-vapour-pressure difficult
asked
Feb 13, 2014
by
sreemathi.v
1
answer
According to Graham's law , at a given temperature , the ratio of rates of diffusion $\large\frac{r_A}{r_B}$ of gases A and B is given by:
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
gas-laws
easy
q15
asked
Feb 13, 2014
by
sharmaaparna1
1
answer
If sodium sulphate is considered to be completely dissociated into cations and anions in aqueous solution, what is the change in freezing point of water$(\Delta T_f)$,when 0.02mol of sodium sulphate is dissolved in 1kg of water,is $(K_f=1.86Kkgmol^{-1})$?
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
colligative-properties
depression-of-freezing-point
easy
asked
Feb 13, 2014
by
sreemathi.v
1
answer
The Compressibility factor for an ideal gas is
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
ideal-gas-equation
easy
q14
asked
Feb 13, 2014
by
sharmaaparna1
1
answer
A binary liquid solution is prepared by mixing n-heptane and ethanol.Which one of the following statements is correct regarding the behaviour of the solution?
jeemain
chemistry
class12
unit2
solutions
q46
medium
asked
Feb 13, 2014
by
sreemathi.v
1
answer
X mL of $H_2$ gas effuses through a hole in a container is 5 Second. The time taken for the effusion of the same Volume of the gas Specified below under identical conditions is
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
ideal-gas-equation
easy
q13
asked
Feb 13, 2014
by
sharmaaparna1
1
answer
If 200 mL of 0.1 M urea solution is mixed with 300 mL of 0.2 M Glucose solutions at 300 K calculate osmotic pressure.
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
colligative-properties
osmotic-pressure
easy
asked
Feb 13, 2014
by
sreemathi.v
1
answer
The curve represents the distribution of potential along the straight line joining the two charges $\;Q_{1}\;$ and $\;Q_{2}\;$ (separated by a distance r ) then which of the following are correct 1. $\;|Q_{1}| > |Q_{2}|\;$ 2. $\;Q_{1}\;is\;+ve\;$ 3. $\;A\;$ and $\;B\;$ are equibrium points 4. $\;C\;$ is point of unstable equilibrium
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
difficult
asked
Feb 13, 2014
by
yamini.v
1
answer
Which of the following solutions will freeze at the lowest temperature?
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
colligative-properties
depression-of-freezing-point
easy
asked
Feb 13, 2014
by
sreemathi.v
1
answer
Which of the following solution boils at the highest temperature?
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
colligative-properties
elevation-of-boiling-point
easy
asked
Feb 13, 2014
by
sreemathi.v
1
answer
Which of the following aqueous solutions posses zero as Van't Hoff coefficient?
jeemain
chemistry
class12
unit2
solutions
q42
medium
asked
Feb 13, 2014
by
sreemathi.v
1
answer
The Van't Hoff factor of $BaCl_2$ is
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
colligative-properties
vant-hoff
basics
easy
asked
Feb 13, 2014
by
sreemathi.v
1
answer
Which one of the following solutions will have the lowest freezing point?
jeemain
chemistry
class12
ch2
solutions
q40
medium
colligative-properties
depression-of-freezing-point
asked
Feb 13, 2014
by
sreemathi.v
1
answer
If $i= 3 \sin tw$ and $i_2= 4 \cos wt$ find $i_3$
jeemain
physics
class12
ch5
current-electricity
kirchoffs-law
easy
asked
Feb 13, 2014
by
meena.p
1
answer
When a substance is dissolved in a solvent,the vapour pressure of the solvent is decreased.This result in
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
colligative-properties
basics
easy
asked
Feb 13, 2014
by
sreemathi.v
1
answer
The osmotic pressures of equimolar solutions of glucose, potassium chloride and Barium chloride will be in the order
jeemain
chemistry
class12
unit2
solutions
q38
medium
asked
Feb 13, 2014
by
sreemathi.v
1
answer
Which of the following is the correct expression for van't Hoff factor?
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
colligative-properties
vant-hoff
basics
easy
asked
Feb 13, 2014
by
sreemathi.v
1
answer
A pin is placed $10 cm$ in front of a convex lens of focal length $20 cm$ made of a material having refractive index $1.5$. The surface of lens is further away from P in is silvered and has a radius of curvature $22 \;cm$ Then position of final image will be :
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
difficult
asked
Feb 13, 2014
by
meena.p
1
answer
When a solute is dissolved in a solvent,the elevation of boiling point of solution is
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
colligative-properties
elevation-of-boiling-point
basics
easy
asked
Feb 13, 2014
by
sreemathi.v
1
answer
Which one of the following aqueous solution will exhibit abnormal osmotic pressure?
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
colligative-properties
osmotic-pressure
easy
basics
asked
Feb 13, 2014
by
sreemathi.v
1
answer
The focal length of a Plano convex lens when curved surface is silvered and object is in front of plane surface is :-
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
difficult
asked
Feb 13, 2014
by
meena.p
1
answer
A 2% solution of non electrolyte X is isotonic with 1% of urea(mol.wt.60),the molecular weight of X is
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
colligative-properties
osmotic-pressure
easy
asked
Feb 13, 2014
by
sreemathi.v
1
answer
A 0.3%(w/v) solution of urea (mol.wt.60) would be isotonic with
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
colligative-properties
osmotic-pressure
medium
asked
Feb 13, 2014
by
sreemathi.v
1
answer
The focal length of a Plano convex lens when plane surface is silvered and object is in front of curved surface is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
difficult
asked
Feb 13, 2014
by
meena.p
1
answer
Which one of the following pair of solutions are expected to be isotonic at the same temperature?
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
easy
colligative-properties
osmotic-pressure
asked
Feb 13, 2014
by
sreemathi.v
1
answer
Calculate osmotic pressure of a solutions having $0.1\; M\;NaCl$ and $0.2\; M\; Na_2SO_4$ and $0.5 M\; HA$. (Given: Weak acid is 20% dissociated at $300^{\circ}K$)
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
colligative-properties
osmotic-pressure
easy
asked
Feb 13, 2014
by
sreemathi.v
1
answer
Osmotic pressure of a dilute solution is
jeemain
chemistry
class12
ch2
solutions
q30
easy
colligative-properties
osmotic-pressure
basics
asked
Feb 13, 2014
by
sreemathi.v
1
answer
Isotonic solutions have the same
colligative-properties
osmotic-pressure
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
basics
easy
asked
Feb 13, 2014
by
sreemathi.v
1
answer
Lets say you enter a Chess tournament. The probability of winning a game against half the players is 0.3, the probability of winning against one quarter of them is 0.4 and the probability of winning against the remaining one quarter is 0.5. Let's say you play against a randomly chosen opponent. What is your probability of winning?
jeemain
math
probability
cbse
easy
sec-a
class12
multiplication theorem
ch13
additionalproblem
mock
asked
Feb 12, 2014
by
balaji.thirumalai
1
answer
Two convex lenses of focal length 20 cm are placed co axially with separation of 60 cm between them. Find image of distant object.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
difficult
asked
Feb 12, 2014
by
meena.p
1
answer
Convex lens of 10 cm focal length is combined with a concave lens of 6 cm focal length. Find focal length of combination.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
easy
asked
Feb 12, 2014
by
meena.p
1
answer
Find the electric field caused by a disc of radius "a" with a uniform charge density $\;\sigma\;$ , at a point along the axis of the disc a distance x from its centre .
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
difficult
asked
Feb 12, 2014
by
yamini.v
1
answer
A lens has a power of +5 diopters in air. What will be power if completely immersed in water? $_a \mu_w =\large\frac{4}{3}$ and $_a \mu_g =\large\frac{3}{2}$
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
difficult
asked
Feb 12, 2014
by
meena.p
1
answer
Which one of the following statement is incorrect about osmotic pressure?
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
easy
basics
colligative-properties
osmotic-pressure
asked
Feb 12, 2014
by
sreemathi.v
1
answer
A convergent lens of 6 diopters is combined with a diverging lens of -2 diopters.Then the power and focal length is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
easy
asked
Feb 12, 2014
by
meena.p
1
answer
Consider a spherical surface of radius 4m centred at the origin . Point +q and -2q are fixed at points $\;A (2m , 0 , 0)\;$ and $\;B (8m , 0 ,0)\;$ respectively . The potential on the surface of sphere is
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
difficult
asked
Feb 12, 2014
by
yamini.v
1
answer
Two liquids X and Y are separated by a semipermeable membrane and if liquid flows from X to Y,it indicates that
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
composition-of-a-solution
basics
asked
Feb 12, 2014
by
sreemathi.v
1
answer
Osmotic pressure of a solution can be measured quickly and accurately by
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
basics
easy
colligative-properties
osmotic-pressure
asked
Feb 12, 2014
by
sreemathi.v
1
answer
Two aqueous solution X and Y are separated by a semipermeable membrane.If the vapour pressure of solution X is greater than the vapour pressure of solution Y,then the solvent water
jeemain
chemistry
class12
unit2
solutions
q25
easy
asked
Feb 12, 2014
by
sreemathi.v
1
answer
An object is placed at an of 45 cm from a converging lens of focal length 30 cm . A mirror of radius of curvature 40 cm is to be placed on other side of lens so that the object coincides with its image. Find the distance of mirror from lens if mirror is convex.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
difficult
asked
Feb 12, 2014
by
meena.p
1
answer
Which one of the following completely dissociated salt solutions will give the lowering of vapour pressure double from its theoretical value?
colligative-properties
lowering-vapour-pressure
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
easy
basics
asked
Feb 12, 2014
by
sreemathi.v
1
answer
The relative lowering of vapour pressure is equal to the molar fraction.This law is known as
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
colligative-properties
lowering-vapour-pressure
basics
easy
asked
Feb 12, 2014
by
sreemathi.v
1
answer
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