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Recent questions tagged unit5
Questions
What is the pressure of HCl gas at $-40^{\large\circ}C$ if its density is $8.0 kgm^{-3}? (R = 8.314 JK^{-1}mol^{-1})$
sat
chemistry
liquids-solids-and-phase-change
states-of-matter
unit5
class11
difficult
ideal-gas-equation
q196
asked
Apr 8, 2014
by
sharmaaparna1
1
answer
A sample of gas occupies a volume of 512 mL at $20^{\large\circ}C$ and 74 cm of Hg as pressure . What volume would this gas occupy at STP?
jeemain
chemistry
states-of-matter
unit5
class11
difficult
ideal-gas-equation
q195
asked
Apr 8, 2014
by
sharmaaparna1
1
answer
Helium and Argon are monoatomic gases and their atomic weights are 4 and 40 respectively . Under identical conditions, helium will diffuse through a semipermeable membrane
jeemain
chemistry
states-of-matter
unit5
class11
difficult
kinetic-molecular-theory-of-gases
q194
asked
Apr 8, 2014
by
sharmaaparna1
1
answer
2g of hydrogen diffuses from a container in 10 minutes . How many grams of oxygen would diffuse through the same container in the same time under similiar conditions ?
jeemain
chemistry
states-of-matter
unit5
class11
difficult
liquifaction-of-gases
q193
asked
Apr 8, 2014
by
sharmaaparna1
1
answer
The time taken for a certain volume of a gas X to diffuse through a small hole is 2 minutes . It takes 5.65 minutes for oxygen to diffuse under the similiar conditions . The molecular weight of X is
jeemain
chemistry
states-of-matter
unit5
class11
difficult
kinetic-molecular-theory-of-gases
q192
asked
Apr 8, 2014
by
sharmaaparna1
1
answer
If same moles of $O_2$ diffuse in 18 sec and same mole of other gas diffuse in 45 sec then what is the molecular weight of the unknown gas?
jeemain
chemistry
states-of-matter
kinetic-molecular-theory-of-gases
unit5
class11
difficult
q191
asked
Apr 8, 2014
by
sharmaaparna1
1
answer
The root mean square of a gas at 300K is $3\sqrt{R}$. The molar mass of this gas in $Kg mol^{-1}$ is
jeemain
chemistry
states-of-matter
unit5
kinetic-molecular-theory-of-gases
class11
difficult
q189
asked
Apr 7, 2014
by
sharmaaparna1
1
answer
The $U_{rms}$ of $SO_2 \;at\;27^{\large\circ}C$
jeemain
chemistry
states-of-matter
kinetic-molecular-theory-of-gases
unit5
class11
difficult
q188
asked
Apr 7, 2014
by
sharmaaparna1
1
answer
The average kinetic energy of 1.6 g $CH_4$ molecules at $27^{\large\circ}C$ is:
sat
chemistry
liquids-solids-and-phase-change
jeemain
states-of-matter
kinetic-molecular-theory-of-gases
unit5
class11
difficult
q187
asked
Apr 7, 2014
by
sharmaaparna1
1
answer
The intermolecular forces vanishes among water molecules , then volume occupied by 1.8 g $H_2O(l)$ at STP is
jeemain
chemistry
states-of-matter
intermolecular-forces-and-thermal-energy
unit5
class11
difficult
q186
asked
Apr 7, 2014
by
sharmaaparna1
1
answer
The intercept of plots of log V vs log T curves at constant pressure P for 1 mole gas will be
jeemain
chemistry
states-of-matter
ideal-gas-equation
unit5
class11
difficult
q185
asked
Apr 7, 2014
by
sharmaaparna1
1
answer
For one mole of an ideal gas $(\large\frac{\delta P}{\delta T})_V.(\large\frac{\delta V}{\delta T})_P . (\large\frac{\delta V}{\delta T})_T $ is equal to ....
jeemain
chemistry
states-of-matter
ideal-gas-equation
unit5
class11
difficult
q184
asked
Apr 7, 2014
by
sharmaaparna1
1
answer
The kinetic molecular theory attributes an average translational kinetic energy of $\large\frac{3}{2}\large\frac{RT}{N}$ to each particle. What rms speed woul a mist particle of mass $10^{-12}g$ have a root temperature $(27^{\large\circ}C)$ according to kinetic theory of gases.
jeemain
chemistry
states-of-matter
kinetic-molecular-theory-of-gases
unit5
class11
difficult
q183
asked
Apr 7, 2014
by
sharmaaparna1
1
answer
The composition of the equilibrium mixture $(Cl_2\iff2Cl)$ which is attained at $1200^{\large\circ}C$ is determined by measuring the rate of effusion through a pinhole . It is observed that at 1.80 mm Hg pressure , the mixture effuses 1.16 times as fast as krypton effuses under the same conditions. Calculate the fraction of chlorine molecules dissociated anto atoms.(Atomic wt of Kr = 84)
jeemain
chemistry
states-of-matter
kinetic-molecular-theory-of-gases
unit5
class11
difficult
q182
asked
Apr 5, 2014
by
sharmaaparna1
1
answer
Pure $O_2$ diffuses through an aperture in 224 seconds whereas mixture of $O_2$ and another gas containing $80\%\;O_2$ diffuses from the same in 234 sec. What is mol. wt. of gas?
jeemain
chemistry
states-of-matter
liquifaction-of-gases
unit5
class11
difficult
q181
asked
Apr 5, 2014
by
sharmaaparna1
1
answer
The average speed at $T_1K$ and the most probable speed at $T_2K of $CO_2$ gas is $9\times10^4cm/s. Calculate the value of $T_1 and T_2$
jeemain
chemistry
states-of-matter
unit5
class11
kinetic-molecular-theory-of-gases
difficult
q180
asked
Apr 5, 2014
by
sharmaaparna1
1
answer
The density of a mixture of $O_2$ and $N_2$ at NTP is 1.3g/l . Calculate partial pressure of $O_2$ .
jeemain
chemistry
states-of-matter
unit5
class11
ideal-gas-equation
difficult
q179
asked
Apr 5, 2014
by
sharmaaparna1
1
answer
The pressure exerted by 12g of an ideal gas at temperature $t^{\large\circ}C$ in a vessel of volume V litre is one atm. when the temperature is increased by 10 degree at the same volume , the pressure increases by $10\%$. Calculate the temperature t and volume V (molecular weight of the gas = 120 )
jeemain
chemistry
states-of-matter
unit5
class11
ideal-gas-equation
difficult
q178
asked
Apr 4, 2014
by
sharmaaparna1
1
answer
A gas filled freely collapsible balloon is pushed from the surface level of lake to a depth of 100 metre . Calculate what per cent of its original volume , the balloon finally have ? Assume ideal gas nature .
jeemain
chemistry
states-of-matter
unit5
class11
difficult
ideal-gas-equation
q177
asked
Apr 3, 2014
by
sharmaaparna1
1
answer
Equal weights of $CH_4$ and $O_2$ are mixed in an empty container of one litre at $27^{\large\circ}C$. Calculate the fraction of total pressure exerted by $O_2$.
jeemain
chemistry
states-of-matter
unit5
class11
kinetic-molecular-theory-of-gases
difficult
q176
asked
Apr 3, 2014
by
sharmaaparna1
1
answer
An open flask contains air at $27^{\large\circ}C$. Calculate temperature at which it should be heated so that , $\large\frac{1}{3}rd$ of air measured at $27^{\large\circ}C$ escapes out.
jeemain
chemistry
states-of-matter
unit5
class11
difficult
ideal-gas-equation
q175
asked
Apr 3, 2014
by
sharmaaparna1
1
answer
A flask is of a capacity of one litre . What volume of air will escape from the flask if it is heated from $27^{\large\circ}C$ to $37^{\large\circ}C$? Assume pressure as constant.
jeemain
chemistry
states-of-matter
unit5
class11
difficult
ideal-gas-equation
q174
asked
Apr 3, 2014
by
sharmaaparna1
1
answer
0.553 g of a boron - hydrogen compound created a pressure of 0.658 atm in a bulb of 407 mL at $100^{\large\circ}C$. Analysis showed it to $85.7\%$ boron . Calculate its molecular formula.
jeemain
chemistry
states-of-matter
unit5
ideal-gas-equation
class11
difficult
q173
asked
Apr 3, 2014
by
sharmaaparna1
1
answer
What would be the final pressure of $O_2$ in following experiment ? A collapsed polyethylene bag of 30 litre capacity is partially blown up by the addition of 10 litre of $N_2$ at 0.965 atm at 298K . Subsequently enough $O_2$ is pumped into bag so that at 298K and external pressure of 0.990 atm, the bag contains full 30 litre.
jeemain
chemistry
states-of-matter
unit5
ideal-gas-equation
class11
difficult
q172
asked
Apr 3, 2014
by
sharmaaparna1
1
answer
The mean kinetic energy of a molecule at $0^{\large\circ}C$ is $5.62\times10^{-14} erg$ . Calculate Boltzmann's Constant . If the value of $R = 8.314\times10^7 erg$ . and also calculate the no. of molecules present in one mole of gas.
jeemain
chemistry
states-of-matter
unit5
kinetic-molecular-theory-of-gases
class11
difficult
q171
asked
Apr 2, 2014
by
sharmaaparna1
1
answer
Two flasks A and B have equal volumes. Flask A contains $H_2$ at $27^{\large\circ}C$ while B contains equal mass of $C_2H_6$ at $627^{\large\circ}C$. In which flask and by how many times are molecules moving faster ? Assume ideal gas nature for both .
jeemain
chemistry
states-of-matter
unit5
gas-laws
class11
q170
asked
Apr 2, 2014
by
sharmaaparna1
1
answer
The critical constant for water are $374^{\large\circ}C$ 218 atm and 0.0566 litre $mol^{-1}$. Calculate a , b and R.
jeemain
chemistry
states-of-matter
unit5
ideal-gas-equation
class11
difficult
q169
asked
Apr 2, 2014
by
sharmaaparna1
1
answer
Calculate the temperature of gas if it obeys Van der Waals equation from the following data. A flask of 25 litre contains 10 mole of a gas under 50 atm . Given $a = 5.46\; atm \;litre^2mol^{-2}$ and $b = 0.031\;litre\;mol^{-1}$
jeemain
chemistry
states-of-matter
unit5
ideal-gas-equation
class11
difficult
q168
asked
Apr 2, 2014
by
sharmaaparna1
1
answer
Using Van der Waals's equation . Calculate the constant 'a' when two mole of a gas confined in a four litre flask exerts a pressure of 11.0 atmospheres at a temperature of 300K . The value of b is 0.05 lit $mol^{-1}$
jeemain
chemistry
states-of-matter
class11
ideal-gas-equation
unit5
difficult
q167
asked
Apr 2, 2014
by
sharmaaparna1
1
answer
A jar contains a gas and a few drops of water at 'T' K . The pressure in the jar is 830mm of Hg. The temperature of the jar is reduced by $1\%$. The vapour pressure of water at two temperature are 30 and 25 mm of Hg. Calculate the new pressure in the jar.
jeemain
chemistry
states-of-matter
unit5
liquifaction-of-gases
class11
difficult
q166
asked
Apr 1, 2014
by
sharmaaparna1
1
answer
A balloon of diameter 20 metre weighs 100kg . Calculate its pay-load if it is filled with He at 1.0atm and $27^{\large\circ}C$ . Density of air is 1.2 $kgm^{-3}$ . [$R = 0.082dm^3\;atm\; K^{-1}\;mol^{-1}$]
jeemain
chemistry
states-of-matter
ideal-gas-equation
unit5
class11
difficult
q165
asked
Apr 1, 2014
by
sharmaaparna1
1
answer
A spherical balloon of 21cm diameter is to be filled up with $H_2$ at NTP from a cylinder containing the gas at 20 atm at $27^{\large\circ}C$. The cylinder can hold 2.82 litre of water at NTP . Calculate the number of balloons that can be filled up.
jeemain
chemistry
states-of-matter
ideal-gas-equation
unit5
class11
difficult
q164
asked
Mar 31, 2014
by
sharmaaparna1
1
answer
A gas occupies 300mL at $27^{\large\circ}C$ and 730 mm pressure . What would be its volume at STP?
jeemain
chemistry
states-of-matter
ideal-gas-equation
unit5
class11
difficult
q163
asked
Mar 31, 2014
by
sharmaaparna1
1
answer
A vessel has nitrogen gas and water vapour at a total pressure of 1 atm . The partial pressure of water vapour is 0.3 atm. When the contents of this vessel are transformed to another vessel having one third of the capacity of original vessel , completely at the same temperature , the total pressure of the system in the new vessel is:
jeemain
chemistry
states-of-matter
ideal-gas-equation
unit5
class11
difficult
q162
asked
Mar 31, 2014
by
sharmaaparna1
1
answer
The pressure occupied by one mole of $CO_2$ at 273K is ........ (Given a for $CO_2$ = 3.592 $dm^6atmmol^{-2}$). Assume volume occupied by $CO_2$ molecules is negligible.
jeemain
chemistry
states-of-matter
ideal-gas-equation
unit5
class11
difficult
q161
asked
Mar 31, 2014
by
sharmaaparna1
1
answer
A gas occupies 0.418 litre at 740 mm of Hg and $27^{\large\circ}C$. Calculate its Volume at STP.
jeemain
chemistry
states-of-matter
ideal-gas-equation
unit5
class11
medium
q160
asked
Mar 29, 2014
by
sharmaaparna1
1
answer
The pressure of the atmosphere is $2\times10^{-6}$ at about 100 mile above the earth and temperature is $-180^{\large\circ}C$ .How many mole are there in 1 mL gas at this altitude?
jeemain
chemistry
states-of-matter
kinetic-molecular-theory-of-gases
unit5
class11
medium
q159
asked
Mar 29, 2014
by
sharmaaparna1
1
answer
A 20g chunk of dry ice is placed in an empty 0.75 litre wine bottle tightly closed . What would be the final pressure in the bottle after all $CO_2$ has been evaporated and temperature reaches to $25^{\large\circ}C$
jeemain
chemistry
states-of-matter
kinetic-molecular-theory-of-gases
unit5
class11
medium
q158
asked
Mar 29, 2014
by
sharmaaparna1
1
answer
A gas at $0^{\large\circ}C$ and 1 atm pressure occupies 2.5 litre . What change in temperature would be necessary if the pressure is to be adjusted to 1.5 atm and the gas has been transferred to a 2.0 litre container?
jeemain
chemistry
states-of-matter
kinetic-molecular-theory-of-gases
unit5
class11
medium
q157
asked
Mar 29, 2014
by
sharmaaparna1
1
answer
5g of ethane are confined in a bulb of 1 litre capacity . The bulb is so weak that it will burst if the pressure exceeds 10 atm. At what temperature will be the pressure of gas reach the bursting value?
jeemain
chemistry
states-of-matter
unit5
class11
medium
q156
asked
Mar 28, 2014
by
sharmaaparna1
1
answer
Atomic and molecular sizes are of the order of a few Angstrom (1 $\overset{\circ}{A} = 10^{-10}m)$ . Assuming that $N_2$ molecules is spherical in shape with radius $2\times10^{-10}m$ . Calculate the volume of single $N_2$ molecule.
jeemain
chemistry
states-of-matter
kinetic-molecular-theory-of-gases
unit5
class11
medium
q155
asked
Mar 28, 2014
by
sharmaaparna1
1
answer
Compressibility factor (Z) for $N_2$ at $-50^{\large\circ}C$ and 800atm pressure is 1.95. Calculate mole of $N_2$ gas required to fill a gas cylinder of 100mL capacity under the given conditions.
jeemain
chemistry
states-of-matter
unit5
class11
medium
q154
asked
Mar 26, 2014
by
sharmaaparna1
1
answer
Calculate molecular diameter of He from its Vander Waal's constant b = 24mL$mol^{-1}$
jeemain
chemistry
states-of-matter
unit5
class11
medium
q153
asked
Mar 26, 2014
by
sharmaaparna1
1
answer
The best vaccum so far attained in laboratory is $10^{-10}mm$ of Hg. How many molecules of gas remain per $cm^3$ at $20^{\large\circ}C$ in this vaccum?
jeemain
chemistry
states-of-matter
unit5
medium
class11
q152
asked
Mar 26, 2014
by
sharmaaparna1
1
answer
$O_2$ is collected over water at $20^{\large\circ}C$. The pressure inside shown by the gas is 740 mm of Hg. What is the pressure due to $O_2$ alone if V.P of $H_2O$ is 18 mm at $20^{\large\circ}C$
jeemain
chemistry
states-of-matter
unit5
class11
medium
q151
asked
Mar 26, 2014
by
sharmaaparna1
1
answer
50 litre of dry $N_2$ is passed through 36g $H_2O$ at $27^{\large\circ}C$. After passage of gas , there is a loss of 1.20g in water . Calculate vapour pressure of water.
jeemain
chemistry
states-of-matter
unit5
class11
medium
q150
asked
Mar 26, 2014
by
sharmaaparna1
1
answer
$O_2$ is present in one litre flask at a pressure of $7.6\times10^{-10}mm$ of Hg. Calculate the number of $O_2$ molecules at $0^{\large\circ}$C.
jeemain
chemistry
states-of-matter
unit5
class11
medium
q149
asked
Mar 26, 2014
by
sharmaaparna1
1
answer
A gas occupies one litre under atmosphere pressure. What will be the volume of the same amount of gas under 750mm of Hg at the same temperature?
jeemain
chemistry
states-of-matter
unit5
class11
medium
q148
asked
Mar 26, 2014
by
sharmaaparna1
1
answer
Which one of the following is not a surfactant ?
jeemain
chemistry
class12
unit5
surface-chemistry
difficult
asked
Mar 20, 2014
by
yamini.v
1
answer
Which of the following phrases correctly explains syneresis ?
jeemain
chemistry
class12
unit5
surface-chemistry
difficult
asked
Mar 20, 2014
by
yamini.v
1
answer
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