1 g of Zn was treated with each of excess of sulphuric acid and excess of NaOH separately. The ratio of the volumes of hydrogen evolved is
10 g of each of the following gases were taken HF HCl HBr HI under similar conditions then
1.all will have same volume
2.HF will have largest volume
3.HI will have largest volume
4.HBr will have lowest volume.
1000 ml of a gas A at 600 torr and 500 ml of gas B at 800 torr are placed in a 2L flask. The final pressure in atmosphere is
500 ml of gas A at 1000 torr and 1000 ml of gas at 800 torr ate placed in an empty container of 2 L capacity. The pressure in the container would be
A balloon containing methane is pricked with a sharp needle and quickly plunged into a tank of hydrogen at same pressure. After sometime the balloon will
3.remain as beforereduce to half of its
3.0.1 atm0.1 atm
1.a is large b is small
2.a is small b is large
3.a and b both are large
4.a b are negligibly small.
A rubber balloon permeable to all isotopic forms of hydrogen is filled with heavy hydrogen and placed in tank of pure hydrogen. After some times the balloon will
1.shrink in size
3.remain as such
4.shrink to half of its size.
A vessel containing gas at a pressure of 60 cm of Hg was connected to arm A of open end manometer. The atmospheric pressure was recorded as 74 cm of Hg. If mercury in arm A stands at 84.5 cm height the mercury in arm will stand at
An ideal gas is at pressure P and temperature T in a box which has been placed in another evacuated large container. The inner box is pricked so that the gas inside it starts escaping out. What is correct?
1.the temperature falls
2.the temperature rises
3.the temperature remains
At constant volume for a foxed number of gas moles the pressure of the gas increases with the rise in temp. because of
1.increase in average molecular speed
2.increased rate of collisions amongst molecules
3.increase in molecular attraction
4.decrease in mean free path.
1.at which it occupies a volume of 22.4 L
2.at which if gets liquefied at 1 atmosphere
3.below which it always exists as liquid
4.above which it always exists as gas.
Each of the four species hydrogen sulphide (I) protium oxide (II) hydrogen chloride (III) and chlorine (IV) at S.T.P. have been put into four separate vessel each of one litre capacity. The largest number of molecules are present in
4.All will have same no. of molecules.
1.V and T at constant P
2.P and T at constant V
3.P and V at constant T
4.V/T and T at constant P.
For ideal gases isotherm refers to the
1.gases at same temperatures
2.gases at same pressure
3.gases having same heat capacities
4.plot of us V at constant T.
Four soldered ampules of equal volumes contain nitrogen ozone chlorine and helium at ordinary conditions. The largest number of atoms will be found in the ampule containing
2.compressing the gas at all temperatures
3.compressing the gas as well as cooling
4.compressing the gas below critical temperature.
One litre of gas weighs 2 g at 300 K and 1 atm pressure. If the pressure is made 0.75 atm and temperature is brought down to 250 K the gas will occupy a volume of
1.The ratio P/T approaches unity
2.The ratio RT/PV approaches unity
3.The ratio PV/RT approaches unity
4.The ratio PV/RT approaches zero.
Rate of diffusion of a gas is
1.directly proportional to its density
2.directly proportional to its molecular mass
3.directly proportional to the square root of its molecular mass
4.inversely proportional to the square root of its molecular mass.
2.attract each other
3.contain covalent bonds
4.show Brownian movement.
1.cause repulsive interactions on one another
2.cause attractive interaction on one anotherare polyatomic
3.do not undergo elastic collisions.
4.None of them
Same gas is confined to two containers A and B. The pressure volume and temperature (K) of gas in A are three times as compared to that in B. If the mass of gas in A is x g then the mass in B would be
2.mean free path
1.low temperature low pressure
2.low temperature high pressure
3.vlow temperature high pressure
4.high temperature low pressure.
4.extent of H-bonding.
The densities of two gases are in the ratio of 1: 16. The ratio of their rates of diffusion is
2.Energy per unit volume
3.Force per unit area
4.Force per unit volume.
2.van der Waal distance
3.can der Wall radius
2.number of electrons in the molecule
3.polarisability of molecules
4.all the above factors.
The mixture of three gases X (density 0.09) Y (density 0.178) and Z (density 0.42) is enclosed in a closed vessel at constant temperature. When equilibrium is establisted the
1.gas X will be at the top of the vessel
2.gas Y will be at the top of the vessel
3.gases X Y Z will constitute homogeneous mixture throughout the vessel
4.gas Y will be at the bottom of the vessel.
The rate of diffusion of methane at certain temperature is 2 times that of gas X. The molecular mass of X is
The temperature at which real gas exhibits ideal behaviour over a wide range of pressure is called
1.decreasing the volume and pressure but keeping the amount constant
2.increasing the pressure but keeping the volume and amount constant
3.decreasing the amount but keeping the volume and pressure constant
4.any of b or c operation.
The value of critical volumes of four gases A B C D are 0.025 L 0.312 L 0.245 L and respectively. The gas with larger value of van der Waal constant b is
1.temperature of the gas
2.volume of the gas
3.number of moles of gas
4.none of these.
The van der Waal constant b is equal to
1.four times the volume of 1 mol of gas
2.the molecular volume of 1mol of gas
3.four times the actual volume of molecules contained in 1 mol of gas
4.twice the molecular volume of 1 mol of gas.
The vapour density a diatomic gas with homoatomic molecules is 25. The atomoc mass of a gas will be
Three different gases X Y Z of molecular masses 32 64 71 were enclosed in a vessel at constant temperature till equilibrium is reached. Which of the following statement is/are true?
1.Gas X will be at the top of the vessel
2.Gas Y will be at the top of the vessel
3.Gas X will be at the bottom and Z will be at the top
4.Gases will form homogeneous mixture.
Three flasks of 2 L capacity were separately filled with argon oxygen and ozone respectively under similar conditions. The ratio of number of atoms in the flasks is
Two flasks of equal capacity contain argon and chlorine gases respectively at room temperature. What is true about them?
1.Both contain same number of atom
2.Cl atoms are half of the Ar atoms
3.Cl atoms are double the number of Ar atoms
4.Chlorine molecules are double the number of argon molecules.
Under which of the following conditions the real gases will approach the behaviour of ideal gas?
1.15 atm 200 K
2.0.5 atm 500 K
3.1 atm 273 K
4.15 atm 500 K.
1.are above inversion temperature
2.exert no attractive force on each other
3.work equal to loss in kinetic energy
4.collide without loss of energy.
1.36 g of water vapours
2.49 g of hydrogen sulphate
3.17 g of ammonia
4.4.4 g of carbon dioxide.
1.2 g of Helium
2.11.2 L of carbon monoxide
3.11.2 L of sulphur dioxide
4.1 mol of phosphine.
1.Molecular collisions are perfectly elastic
2.Gas molecules move at random with ever changing speeds
3.Molecular collision against the wall are responsible of gas pressure.
4.KE of a gas is given by the sum of 273 and temperature in celcius scale.
1.The molecules possess random movement in all directions
2.Gases intermix freely without the help of external agency
3.They are highly compressible
4.They possess definite volume.
1.gas molecules are in a permanent state of random motion
2.pressure of gas is due to molecular impacts on the walls
3.the molecules are perfectly elastic
4.the molecular collisions are elastic.
Which of the following pairs of gas will diffuse at the same rate under similar conditions?
1.carbon dioxide and nitrous oxide
2.carbon dioxide and nitrogen dioxide
3.carbon dioxide and nitric oxide
4.carbon monoxide and carbon dioxide.
1.The product PV for fixed amount of gas is independent of temperature.
2.Molecules of different gases have same KE at a given temperature.
3.The gas equation is not valid at high pressure and low temperature.
4.The gas constant per molecule is known as Boltzman constant.
1.Change in temperature
2.Change in volume at constant T
3.Change in volume at constant T
4.Change in number of gas molecules.
wo gases X and Y are at same temperature and pressure. The reduced temperature of X is below unity while that of Y is above unity. Thus
1.X can be liquefied by compression but not Y
2.Y can be liquefied by compression but not X
3.both X and Y can be liquefied by compression
4.none of the statement is correct.