GASEOUS STATE STATES OF MATTER MOST EXPECTED QUESTIONS for IIT JEE MAINS,NEET,EAMCET,EAPCET

 GASEOUS STATE (STATES OF MATTER) MOST EXPECTED QUESTIONS 

for IIT JEE MAINS,NEET,EAMCET,EAPCET

All questions given below  related to 

states of matter (class 11,grade 11,ap chemistry,physical chemistry)  gaseous state,gaseous laws,boyle's law,charles law,amontons law,gaylussac's law,ideal gas equation,vander waals equation, boyle's temperature, real gas equation, grahams law of diffusion ,dalton's law, kinetic molecular theory of gases,critical variables,surface tension,viscosity 

You can find the detailed solutions for below questions in the PDF link shown in the last section of this . 

these questions are picked up from various entrance exams like kvpy,olympiad,ugee,iist,iit jee mains& advanced, NEET, also state level entrance exams like TS eamcet, MHTCET,AP EAPCET, COMEDK,solved in detail for solutions download PDF.link provided below.

1.Which of the following is wrong?

1) when temperature is increased surface tension of water decreases

2) viscosity of a liquid increases with increase in pressure.

3) Addition of little surface active agent like soap to water increases its surface

tension.

4) Addition of a surfactant in water increases its viscosity.

2. A vessel of volume 5 lit. Contains 14g of N2 at 1800K, 30% of its molecules

dissociate into atoms. The pressure in the vessel at this temperature is

1) 14.778 atm

2) 7.35 atm

3) 19.2 atm

4) 38.4 atm

3.Observe the statements

a) Dipole-Dipole interaction energy between rotating polar molecules is proportional

to61r [r=distance between polar molecules]

b) London forces are always attractive and interaction energy is inversely

proportional to1/r6  [rdistance between two particles]

c) Dipole-Dipole interaction energy between stationary polar molecules is

proportional to 1/r3.

d) The order of thermal energy is “solid < liquid < gas”.

The correct statements are

1) a, b, c, d

2) a, b, c only

3) b, c, d only

4) a, c, d only

4. By how much will the mean free path of a gas molecule in a vessel at constant T

change if the pressure is reduced by 10%?

1) 10% increase

2) 10% decrease

3) 11.1% increase

4) 11.1% decrease

5. Number of N2 molecules present in L vessel at NTP when compressibility factor is

1.2 is?

6.  For a gas obeying P V b RT, which of the following is wrong?

1) The slope of isochoric curve is 

2) The slope of isobaric curve is

3) The intercept of isobaric curve is ‘b’

4) Attractive forces predominates and hence the gas is more compressible

7. At low pressures, the van der Waals equation is written as The

compressibility factor is then equal to

8. Which gas shows real behavior?

1) 8g O2 at STP occupies 5.6L

2) 1g H2 in 0.5L flask exerts a pressure of 24.63atm at 300K.

3) 1 mol NH3 at 300K and 1 atm occupies volume 22.4L.

4) 5.6L of CO2 at STP is equal to 11g.

9. When the temperature increase, the surface tension of water

1) Increases

2) Decreases

3) Remains constant

4) Shows irregular behaviour

10. The SI unit of the coefficient of viscosity is

11 The term that is correct for the attractive forces present in a real gas in the van der

Waals equation is

12.

Positive deviation from ideal behavior takes place because of

1) The molecular interaction between atom and PV nRT / 1

2) The molecular interaction between atom and PV nRT / 1

3) The finite size of atoms and PV nRT / 1

4) The finite size of atoms and PV nRT / 1

13. Compressibility factor of H2 above 108K 

14. For a monatomic gas, kinetic energy E . The relation with rms velocity is

15.

The value of the Vander Waal’s constant ‘a’ for the gases O2 ,CO2 ,C2H 6 

and SO2 respectively are 1.36, 3.59, 5.49 and 6.72. Which gas can be

easily liquefied ?

1) O2

2) CO2

3) C H2 6

4) SO2

16. Arrange vander Waal’s constant ‘b’ for the gases

17.

If v is the volume of one molecule of a gas under given conditions, the van der Waals

constant b is

1) 4v

2) 4 / v N0

3)0 / 4N v

4) 4vN0

18. Oxygen gas diffuses from two different vessels ‘A’ and ‘B’ under identical conditions

but ‘A’ has circular orifice while ‘B’ has square orifice. If the diagonal of square is

equal to diameter of circle, the ratio of rates of diffusion in the two vessels will be

19. Select the incorrect assumptions s) for Kinetic Theory of Gases.

i) Gas molecule are rigid spheres

ii) Kinetic energy of a molecule is conserved

iii) Linear momentum of molecules is conserved during collision

iv) collision may get affected by intermolecular forces

1) ii,iv

2) iv

3) iii

4) iii, iv

20. When equal weights of O2 and N2 are placed in separate containers of equal volume

at the same temperature, which of the following statements is true?

1) both flasks contain same number of molecules

2) the pressure in oxygen flask is smaller than the one in the nitrogen flask

3) more molecules are present in the oxygen flask

4) molecules in the nitrogen flask are moving slower on the average than ones in the

oxygen flask

21. A balloon has maximum capacity of 20 L. At one atmosphere pressure lessthan10 L

of air is filled in the balloon. It will burst when pressure is (assuming isothermal

condition)___ atm

22. Under identical condition of temperature and pressure, 1 litre of CH4weighed 1.2 gm

while 2 litre of another gaseous hydrocarbon Cn Hn2- 2 weighed 8.1 gm. the value of

‘n’ (Assume ideal gas behavior)is______

23. The vapour pressure of water at 800C is 355 mm of Hg . A 100 ML vessel contains

water saturated with O2 at800C , the total pressure being 760 mm of Hg . The

contents of the vessel were pumped into 50 mL vessel at the same temperature .What

is the partial pressure of O2 is ____mm

24. A box is divided into two equal compartments by a thin partition and they are filled

with gases X and Y respectively . The two compartments have a pressure of 250

torr each . The pressure after removing the partition will be equal to ___ torr

25. Root mean square velocity gas molecules is 300 m/sec .The r.m.s velocity of

molecules of gas with twice the molecular Weight and half the absolute temperature

is ____m/sec.

26. If density of vapours of a substance of molar mass 18 gm/mole at 1 atm pressure and

500 k is 0.36Kgm3 then the value of Z for the vapour is (Take R = 0.082 L atm mole

‘K’)

27. A vessel of irregular shape has a volume ‘V’. It is first evacuated and coupled with a

vessel of 4L capacity at 350C and 10 atm pressure. If the final pressure in both the

vessels is 3atm, then the volume V is___L.

28. A gas is enclosed in a vessel of volume 1000 mL at a pressure of 72.6 cm of Hg. it is

being evacuated with the help of a piston pump, which expels 10% gas in each stroke.

What will be the pressure after the second stroke is ___cm

29. A flask containing 250mg of air at 270C is heated till 25% of air by mass is expelled

from it. What is the final temperature of the flask is ___ 0C

30. The temperature at which CO2 has the same rms speed of that of O2 at STP is ___ 0C

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