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Questions asked by sharmaaparna1
Questions
282
questions
0
answers selected
Four particles have speed 2,3,4 and 5 cm/sec respectively. Their RMS speed is
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
kinetic-molecular-theory-of-gases
medium
q114
asked
Mar 2, 2014
1
answer
Average velocity of the molecules of a gas in a container moving in one dimension is
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
kinetic-molecular-theory-of-gases
medium
q113
asked
Mar 2, 2014
1
answer
If P is the pressure of gas, then the kinetic energy per unit volume of the gas is
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
kinetic-molecular-theory-of-gases
medium
q112
asked
Mar 2, 2014
1
answer
Densities of air in chandigarh was found to be $1.156kgm^{-3}$. The temperature and pressure were recorded as $20^{\large\circ}C$ and $100.142\; KPa$. The average molecular mass of the air at that place in $g \;mol^{-1}$ is
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
ideal-gas-equation
medium
q111
asked
Mar 2, 2014
1
answer
Assume the centre of sun to consists of gases whose average molecular mass is $2.0\;u$. The density and the pressure of the gas are respectively, $1.3g\;cm^{-3} and\; 1.12\times10^9$ atm. What is the approximate temperature of the Sun?
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
ideal-gas-equation
medium
q110
asked
Mar 1, 2014
1
answer
An LPG cylinder contain 15kg of butane gas at $27^{\large\circ}C$ and 10 bar pressure. The cylinder linked and it was found that after 4 days , the mass of the gas left in cylinder was only 10 kg. How much drop in pressure was occured in each day?
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
gas-laws
medium
q109
asked
Mar 1, 2014
1
answer
Densities of two gases of same molecular weight are in the ratio 1:2 and their temperature are in the ratio 2:1 then the ratio of their respective pressures is
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
ideal-gas-equation
medium
q108
asked
Mar 1, 2014
1
answer
The density of a gas at STP is 2.68g/L . The gas may be
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
ideal-gas-equation
medium
q107
asked
Mar 1, 2014
1
answer
If the pressure of $N_2/H_2$ mixture in a closed vessel is 100 atm and 20% of the mixture then reacts , the pressure at the same temperature would be
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
ideal-gas-equation
medium
q106
asked
Mar 1, 2014
1
answer
A gas is heated through $1^{\large\circ}C$ in a closed vessel and so the pressure increases by $0.4\%$ . The initial temperature of the gas was
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
ideal-gas-equation
medium
q105
asked
Mar 1, 2014
1
answer
Volume coefficient according to charle's law is
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
gas-laws
medium
q104
asked
Mar 1, 2014
1
answer
To expel half the mass of air from a large flask at $27^{\large\circ}C$ , it must be heated to
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
ideal-gas-equation
medium
q103
asked
Mar 1, 2014
1
answer
The concentration of $O_2$ and $CO_2$ is variable but on the average , $100\;mL$ blood contains 0.02g of $O_2$ and $0.08\;g$ of $CO_2$. Calculate the Volume of $O_2$ and $CO_2$ at $1\; atm$ and body temperature $37^{\large\circ}C$ assuming $10$ litre blood in human body.
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
ideal-gas-equation
medium
q102
asked
Mar 1, 2014
1
answer
A gas in an open container is heated from $27^{\large\circ}C$ to $127^{\large\circ}C$. The fraction of the original amount of gas remaining in the container will be
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
ideal-gas-equation
medium
q101
asked
Feb 28, 2014
1
answer
Boyle's law may be represented as
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
gas-laws
medium
q100
asked
Feb 28, 2014
1
answer
An alloy of Copper , Silver and Gold is found to have Copper constituting the C.C.P lattice. If Silver atoms occupy the edge centres and Gold is present at body centre , the alloy will have the formula:
jeemain
chemistry
class12
ch1
states-of-matter
solid-state
packing-in-crystalline-solids
medium
asked
Feb 28, 2014
1
answer
The compound formed by elements X and Y crystallizes in cubic structure in which X atoms are at the corners of the cube and Y atoms are at the face centre . The formula of the compound is
jeemain
chemistry
class12
ch1
states-of-matter
solid-state
packing-in-crystalline-solids
easy
asked
Feb 28, 2014
1
answer
In a face centred cubic arrangement of A and B atoms whose A atoms are at the corner of the unit cell and B atoms at the face centered. One of the A atom is missing from one corner in unit cell. The simplest formula of compound is
jeemain
chemistry
class12
ch1
states-of-matter
solid-state
packing-in-crystalline-solids
easy
asked
Feb 28, 2014
1
answer
The ratio of closed packed atoms to tetrahedral holes in cubic close packing is
jeemain
chemistry
class12
ch1
states-of-matter
solid-state
packing-in-crystalline-solids
easy
asked
Feb 28, 2014
1
answer
The Vacant space in body centered cubic lattice b.c.c unit cell is about
sat
chemistry
liquids-solids-and-phase-change
jeemain
class12
ch1
states-of-matter
solid-state
packing-in-crystalline-solids
easy
asked
Feb 27, 2014
2
answers
Vanadium crystallises with a body centered cubic structure with a unit cell of side length $3.011A^{\large\circ}$. Calculate the atomic radius and density (V = 50.94)
jeemain
chemistry
class12
ch1
states-of-matter
solid-state
calculations-involving-unit-cell-dimensions
medium
asked
Feb 27, 2014
1
answer
The densities of NaCl crystal as measured by Spectrometer and X - ray method are $2.165\times10^3 kgm^{-3}$ and $2.178\times10^3 kgm^{-3}$, respectively . The fraction of unoccupied sites in sodium chloride crystal is
jeemain
chemistry
class12
ch1
states-of-matter
solid-state
calculations-involving-unit-cell-dimensions
easy
asked
Feb 27, 2014
1
answer
$CsBr$ crystallises in a body centered cubic lattice. The unit cell length is $436.6\; pm$ . Given that the atomic mass of $Cs = 133$ and of $Br = 80\; amu$. Avogadro's number being $6.02\times10^{23}mol^{-1}$ The density of $CsBr$ is
jeemain
chemistry
class12
ch1
states-of-matter
solid-state
calculations-involving-unit-cell-dimensions
medium
asked
Feb 27, 2014
1
answer
Silver (atomic weight = $107.88$) crystallises with f.c.c lattice for which the side length of the unit cell is $4.0774\overset{\circ}{A}$. Density of $Ag$ is $10.53\; g\;cm^{-3}$. Calculate the Avogadro's number.
jeemain
chemistry
class12
ch1
states-of-matter
solid-state
calculations-involving-unit-cell-dimensions
easy
asked
Feb 27, 2014
1
answer
A match box exhibits :
jeemain
chemistry
physical-chemistry
class12
unit1
states-of-matter
solid-state
crystal-lattices-and-unit-cells
easy
q90
asked
Feb 27, 2014
1
answer
The angle at which first order reflection will occur when X-ray of wavelength $1.54A^{\large\circ}$ are diffracted by the atoms of a crystal ; the interplanar distance is $4.04A^{\large\circ}$
jeemain
chemistry
class12
ch1
states-of-matter
solid-state
medium
q89
asked
Feb 27, 2014
1
answer
CsBr has b.c.c structure with edge length $4.3 A^{\large\circ}$. The shortest inter ionic distance between $Cs^+$ and $Br^-$ is
jeemain
chemistry
class12
ch1
states-of-matter
solid-state
calculations-involving-unit-cell-dimensions
easy
asked
Feb 27, 2014
1
answer
A metal M(at.wt = 40.0) depending on temperature crystallises in f.c.c and b.c.c structure whose unit cell length are 3.5 and $3.0 A^{\large\circ}$ respectively. The ratio of its densities in f.c.c and b.c.c structures is
jeemain
chemistry
class12
ch1
states-of-matter
solid-state
calculations-involving-unit-cell-dimensions
medium
asked
Feb 25, 2014
1
answer
A unit cell of NaCl has four formula units. The edge length of unit cell is 0.564. The density of NaCl is
jeemain
chemistry
class12
ch1
states-of-matter
solid-state
calculations-involving-unit-cell-dimensions
easy
asked
Feb 25, 2014
1
answer
At room temperature , Sodium crystallizes in a b.c.c lattice with edge length $a = 4.24A^{\large\circ}$ . Find the theoretical density of sodium.
jeemain
chemistry
physical-chemistry
class12
unit1
states-of-matter
solid-state
calculations-involving-unit-cell-dimensions
asked
Feb 25, 2014
1
answer
The density of KBr is 2.73g/cm. The length of the unit cell is 654pm. Find the number of atoms per unit cell in the cubic structure.
jeemain
chemistry
physical-chemistry
class12
unit1
states-of-matter
solid-state
calculations-involving-unit-cell-dimensions
medium
q84
asked
Feb 25, 2014
1
answer
Find the co-ordination number of sodium in $Na_2O$.
jeemain
chemistry
states-of-matter
unit5
class11
medium
q83
asked
Feb 25, 2014
0
answers
In CsCl with cubic structure $Cl^-$ ions are located at each corner and $Cs^+$ ions at the centre of the unit cell. If $r_{Cs^+}$ and $r_{Cl^-}$ are $1.69A^{\large\circ}$ and $1.81A^{\large\circ}$ respectively . Find the value of edge length of cube.
jeemain
chemistry
physical-chemistry
class12
unit1
states-of-matter
solid-state
calculations-involving-unit-cell-dimensions
medium
q82
asked
Feb 25, 2014
1
answer
The density of cr atoms is 7.2g/cm. If the unit cell has edge length 289 pm. Calculate the number of chromium atoms per unit cell. (at mass of cr = 52)
jeemain
chemistry
physical-chemistry
class12
unit1
states-of-matter
solid-state
calculations-involving-unit-cell-dimensions
asked
Feb 24, 2014
1
answer
Ice crystallizes in hexagonal lattice. At the low temperature at which structure was determined the lattice constants were $a = 4.53A^{\large\circ}$ and C = $b = 7.41A^{\large\circ}$ .Calculate the no. of $H_2O$ molecules present in a unit cell. (Density of ice = 0.92g/cm)
jeemain
chemistry
physical-chemistry
class11
states-of-matter
ideal-gas-equation
medium
q80
asked
Feb 24, 2014
1
answer
A compound $AB_x$ is formed such that A atoms are at corners and B atoms at face centre. Find the value of $x$ .
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
intermolecular-forces-and-thermal-energy
medium
q79
asked
Feb 24, 2014
1
answer
Chromium metal crystallizes with a b.c.c lattice. The edge length of the unit cell is found to be 287pm. Calculate the density of chromium in $g\;cm^{-3}$(at weight of cr = 52).
jeemain
chemistry
class12
ch1
states-of-matter
solid-state
calculations-involving-unit-cell-dimensions
easy
asked
Feb 24, 2014
1
answer
A molecule $A_2B$(mol.weight = 166.4) occupies triclinic lattice with a = 5A , b = 8A and C = 4A . If density of $AB_2$ is $5.2g cm^{-3}$. Calculate the number of molecules present in one unit cell.
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
ideal-gas-equation
medium
q77
asked
Feb 24, 2014
1
answer
A cylinder container with the moveable piston initially hold 3.0 mole of a gas at 8.0 atm pressure and a volume of 5.0 litre. If piston is moved to create a volume 10.0 litre , while simultaneously with drawing 1.5 mole of gas. Calculate the final pressure.
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
ideal-gas-equation
medium
q76
asked
Feb 23, 2014
1
answer
An L.P.G Cylinder contains 15kg of butane gas at $27^{\large\circ}C$ and 10 atm pressure. It was leaking and its pressure fell down to 8 atm pressure after one day. Calculate the amount of leaked gas.
jeemain
chemistry
physical-chemistry
class11
states-of-matter
ideal-gas-equation
medium
q75
asked
Feb 23, 2014
1
answer
Density of a gas is found to be $5.46g/dm^3$ at $27^{\large\circ}C$ at 2 bar pressure. What will be its density at STP?
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
ideal-gas-equation
medium
q74
asked
Feb 23, 2014
1
answer
A 40 mL of a mixture of $H_2O$ and $O_2$ was placed in a gas burette at $18^{\large\circ}C$ and 1 atm P. A spark was applied so that the form a pure gas had a volume of 10mL at $18^{\large\circ}C$ and 1 atm P . If the remaining gas was $H_2$, what was the initial mole $\%$ of $H_2$ in mixture?
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
ideal-gas-equation
medium
q73
asked
Feb 23, 2014
1
answer
Calculate the percentage of free volume available in 1 mole gaseous water at 1.0atm and $100^{\large\circ}C$. Density of liquid $H_2O$ at $100^{\large\circ}C$ is 0.958 g/mL.
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
ideal-gas-equation
medium
q72
asked
Feb 23, 2014
1
answer
Calculate the average volume available to a molecule in a sample of nitrogen gas at STP. What is the average distance between neighbouring molecules if nitrogen molecules are spherical in nature?
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
ideal-gas-equation
medium
q71
asked
Feb 21, 2014
1
answer
The average speed of an ideal gas molecule at $27^{\large\circ}C$ is 0.3 m/s. Calculate the average speed at $927^{\large\circ}C$
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
kinetic-molecular-theory-of-gases
medium
q70
asked
Feb 21, 2014
1
answer
A vertical hollow cylinder of height 1.52m is fitted with a movable piston of negligible mass and thickness. The lower half of the cylinder contains an ideal gas and the upper half is filled with mercury. The cylinder is initially at 300K. When the temperature is raised half of the mercury comes out of the cylinder . Find the temperature assuming the thermal expansion of mercury to be negligible.
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
ideal-gas-equation
medium
q69
asked
Feb 21, 2014
1
answer
A vessel of volume 5 litre contains 1.4g of nitrogen at temperature 1800K. Find the pressure of the gas if $30\%$ of its molecules are dissociated into atoms at this temperature.
jeemain
chemistry
physical-chemistry
class11
unit4
states-of-matter
gas-laws
medium
q68
asked
Feb 20, 2014
1
answer
An evacuated glass vessel weighs 50.0g when empty 148.0 g when filled with a liquid of density $0.98gmL^{-1}$ and 50.5g when filled with an ideal gas at 760mm Hg of 300K.Determine the molecular weight of the gas.
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
liquid-state
medium
q67
asked
Feb 20, 2014
1
answer
The Volume of the average adult lung when expanded is about $6L$ at $98.4^{\large\circ}F$. If the pressure of oxygen in inhaled air is $168mm$ of $Hg$ , calculate the mass of $O_2$ required to occupy the lung at $98.4^{\large\circ}F$.
chemistry
jeemain
physical-chemistry
class11
states-of-matter
ideal-gas-equation
medium
q66
asked
Feb 20, 2014
1
answer
Two glass bulbs with equal volume are connected by a narrow tube and filled with a gas at $0^{\large\circ}C$ and pressure of $76\;cm\; Hg$ . One of the bulb is then placed in a water bath maintained at $62^{\large\circ}C$. What is the new value of the pressure inside the bulbs? The volume of the connecting tube is negligible.
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
ideal-gas-equation
medium
q65
asked
Feb 20, 2014
1
answer
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