Assignment-2 (Chemistry)---STATES OF MATTER

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1. All the three states i.e. water, ice and vapour exist simultaneously at

1. 4.58 mm & 0.0098⁰ C
2. 3.67 mm & 0.0891⁰C
3. c. S.T.P conditions
4. 25⁰ C & 1 atm.

2. A certain sample of gas has a volume of 0.2 L measured at 1 atm. Pressure at 0⁰ C at the same pressure but 273 0C it’s vol. will be

1. 0.4 L
2. 0.8 L
3. 27.8L
4. 55.6 L

3. Which is the correct value of vibrational degree of freedom of C₆H₆

a. 2

b. 3

c. 15

d. 30

4. Triple point of water is

1. 273 K
2. 373 K
3. 203 K
4. 193 K

5. Equal masses of methane and hydrogen are mixed in an empty container at 25⁰C. the fraction of the total pressure exerted by hydrogen is

1. ½
2. 8/9
3. 1/9
4. 16/17

6. Dalton’s law of partial pressure will not applicable to which of the following gaseous mixtures

1. Nitric oxide & oxygen
2. Nitrogen & oxygen
3. CO & H₂
4. N₂ & H₂

7. The densities of 2 gases are in the ratio of 1:16. the ratio of their rates of diffusion is

1. 16:1
2. 4:1
3. 1:4
4. 1:16

8. A football bladder contains equimolar proportion of H₂ and O₂. the composition by mass of the mixture effusing out of punctured football is in the ratio (H₂:O₂)

1. 1:4
2. 2√2:1
3. 1:2√2
4. 4:1

9. If vapour density of O₂ &H₂ are 16 and 1,then the ratio of rate of diffusion of H₂ to that of diffusion of O₂ is

1. 16
2. 1/16
3. 4
4. ¼

10. At constant volume and temperature conditions the rates of diffusion D_A and D_B of gases A & B having densities ρ_A and ρ_B are related by the expression

1. D_A=[D_B ρ_A/ρ_B]^1/2
2. DA=[D_B ρ_B/ρ_A]^1/2
3. D_A=D_B [ρ_A/ρ_B]^1/2
4. D_A=D_B [ρ_B/ρ_A]^1/2

10. A constant volume for a fixed no. of moles of a gas ,the pressure of the gas increases with the rise in temp. due to

1. increase in average molecular speed
2. increase in rate of collisions
3. increase in molecular attraction
4. increase in mean free path

11. When an ideal gas undergoes unrestricted expansion, no cooling occurs because the molecules

1. exert no attractive force on each other
2. collide with loss of energy
3. do work equal to K.E. loss
4. Exert attractive forces.

12. The K.E. of 4 moles of nitrogen gas 127⁰C is (R=2 cal mol-1 K^-1)

1. 4400 cals
2. 3200 cals
3. 4800 C
4. 1524 cals

13. The temp. at which real gases obey the ideal gas laws over a wide range of pressure is called

1. Critical temp.
2. Boiling temp.
3. inversion temp.
4. reduced temp.

14. The volume of 2.8g of CO at 27⁰C and 0.821 atm pressure is:

1. 3.0 L
2. 3 L
3. 0.3 L
4. 1.5 L

15. The pressure of 2 moles of ideal gas at 546 K having volume 44.8 L is

1. 2 atm. .
2. 3 atm.
3. 4 atm
4. 1 atm.

16. If the density of the Gas A is 1.5 times that of B, then the molecular mass of A is M the molecular mass of B will be

1. 1.5 M
2. M/1.5
3. 3M
4. M/3

17. The molar mass of an ideal gas can be calculated from the expression

1. M=ρRT/PV
2. M=RT/Pρ
3. M=Pρ/RT
4. M=ρRT/P

18. Vander waal’s real gas acts as ideal gas under which conditions?

1. high temp. low pressure.
2. low temp. ,high pressure
3. high temp. high pressure
4. low temp, low pressure

19. A gas deviates from ideal gas behavior b’coz its molecules

1. are colorless
2. attract each other
3. contain covalent bonds
4. show Brownian movement

20. The compressibility factor for an ideal gas is

1. 1.5
2. 1.0
3. 2.0
4. ∞

21. The excluded volume per molecule of a gas is……….times the actual volume of the gas molecule

1. 2
2. 3
3. 4
4. 5

22. The constant ‘a’ in a Vander waal’s eqn. is maximum in

1. Helium
2. hydrogen
3. nitrogen
4. ammonia

23. Ideal gas eqn. was modified by

1. Hunts
2. Avogadro
3. Vander waal
4. Gram

24. A real gas tends to behave more ideally at

1. Low temp. Low pressure
2. Low temp. High pressure
3. high temp. & low pressure
4. high temp. & high pressure

25. If 2 moles of an ideal gas at 546 K occupy the volume of 44.8 L, the pressure must be :

1. 3 atm
2. 2 atm
3. 1atm
4. 4 atm

26. The K.E. per moles of an ideal gas at 300 K in kj is

1. 34.8
2. 3.48
3. 3.74
4. 348.

27. The gas i.e. heated up during Joule-Thompson effect at ordinary temp. is

1. O₂
2. CO₂
3. H₂
4. SO₂

28. The temp. to which a gas must be cooled before it can be liquefied by Appling pressure is called:

1. Boyle’s temp.
2. Critical temp.
3. Inversion temp.
4. explosion temp.

29. At what temp. is the K.E. of a gas molecule half that of its value at 270C

1. 3.50C
2. 1500C
3. 150 K
4. -123K

30. The compressibility factor for H₂ and He is usually

a. >1

b. <1

c. =1

either of these