# IIT JEE/IIT JEE Gaseous State Sample Test,Sample questions

1.1:01

2.1:02

3.9:04

4.2:01

## Question: `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.

1.2000

2.1000

3.500

4.0.657.

1.100 torr

2.2400 torr

3.650 torr

4.1800 mm.

## Question: `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`

1.get enlarged

2.get collapsed

3.remain as beforereduce to half of its

4.original size.

1.0.01 atm

2.1 atm

3.0.1 atm0.1 atm

4.10 atm.

## Question: `A real gas which obeys van der Waals equation will approach ideal behaviour if`

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.

## Question: `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

2.expand

3.remain as such

4.shrink to half of its size.

1.70.5 cm

2.74 cm

3.24.5 cm

4.88 cm.

## Question: `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

4.the sameunpredictable.

## Question: `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.

## Question: `Critical temperature of the gas refers to the temperature`

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.

## Question: `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`

1.i

2.ii

3.iii

4.All will have same no. of molecules.

## Question: `For ideal gas isochors refer to the graphs between`

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.

## Question: `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.

1.chlorine

2.ozone

3.helium

4.nitrogen.

1.72

2.140

3.144

4.100

1.1 atm

2.2 atm

3.3 atm

4.4 atm.

## Question: `Liquefication of gases cannot be achieved by`

1.cooling

2.compressing the gas at all temperatures

3.compressing the gas as well as cooling

4.compressing the gas below critical temperature.

1.2 L

2.1.11 L

3.2.22 L

4.0.7 L.

## Question: `Pick up correct answer among the following about Boyles temperature`

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.

## Question: `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.

## Question: `Real gases deviate from ideal behaviour because the molecules`

1.are colourless

2.attract each other

3.contain covalent bonds

4.show Brownian movement.

## Question: `Real gases deviate from ideal behaviour because their molecules`

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

1.x g

2.0.3x g

3.0.5x g

4.3x g.

## Question: `The average distance traveled by the molecule between successive collisions is called`

1.collision path

2.mean free path

3.collision diameter

4.collision distance.

## Question: `The behaviour of a real gas approaches ideal behaviour at`

1.low temperature low pressure

2.low temperature high pressure

3.vlow temperature high pressure

4.high temperature low pressure.

## Question: `The bottle of liquid ammonia is cooled before opening the seal so as to lower its`

1.vapour pressure

2.surface tension

3.viscosity

4.extent of H-bonding.

1.16:01

2.4:01

3.1:04

4.1:16

## Question: `The dimensions of pressure are some as that of`

1.Energy

2.Energy per unit volume

3.Force per unit area

4.Force per unit volume.

## Question: `The distance between the centres of the molecules at the closest approach is called`

1.collision diameter

2.van der Waal distance

## Question: `The magnitude of van der Waals forces depends upon`

1.molecular size

2.number of electrons in the molecule

3.polarisability of molecules

4.all the above factors.

## Question: `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.

1.64

2.32

3.4

4.8.0.

1.Plasma

2.Solid

3.Gaseous

4.Liquid.

## Question: `The temperature at which real gas exhibits ideal behaviour over a wide range of pressure is called`

1.Inversion temperature

2.Boyle temperature

3.Reduced temperature

4.Critical temperature.

## Question: `The temperature of ideal gas can be increased by`

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.

## Question: `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.A

2.D

3.B

4.unpredicatable.

## Question: `The value of universal gas constant depends upon`

1.temperature of the gas

2.volume of the gas

3.number of moles of gas

4.none of these.

## Question: `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.

1.150

2.25

3.75

4.22

1.M/2

2.4M

3.M/4

4.2M.

## Question: `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.

1.1:01:01

2.1:02:03

3.3:02:01

4.2:02:03

## Question: `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.

1.15 atm 200 K

2.0.5 atm 500 K

3.1 atm 273 K

4.15 atm 500 K.

## Question: `When ideal gas undergoes unstrained expansion no cooling occurs because the molecules`

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.

## Question: `Which among the following contains Avogadro number of molecules?`

1.36 g of water vapours

2.49 g of hydrogen sulphate

3.17 g of ammonia

4.4.4 g of carbon dioxide.

## Question: `Which among the following samples of gases contains Avogadro number of atoms at S.T.P.?`

1.2 g of Helium

2.11.2 L of carbon monoxide

3.11.2 L of sulphur dioxide

4.1 mol of phosphine.

## Question: `Which of the following do not pertain to the postulates of kinetic theory of gases?`

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.

## Question: `Which of the following is false about gases`

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.

## Question: `Which of the following is not the postulate of the kinetic theory of gases?`

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.

## Question: `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.

## Question: `Which of the following statement is false?`

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.

## Question: `Which of the following will not change the r.m.s. if the gas molecules?`

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.

## Question: `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.

## More MCQS

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