MDCAT XI Chemistry States of Matter: Gases Online Test-2

1. Which of the following shows maximum deviations from ideal behaviour .

A.CO2

B.O2

C.H2

D. NH3

2. If the value of PV/nRT is --------- it shows deviation from ideal behaviour of gas

I. Postive (greater than 1)

II . Negative (less than 0)

III. Value= 1

A. I,II , III

B. I,II

C. III only

D. I only

3. Graham's law is realted with diffusion and effusion in relation with density . In practical at sea level air is dense is explained by which law

A. Graham's law of diffusion

B. Dalton's law

C. Boyle's law

D. Charles law

4. When temperature increases the mean free path

A. Increase

B. Decrease

C. Become zero

D. No change

5. Pressure of a mixture of 32g of SO2 and 28g of N2 confined in a vessel of

22.4L at 0°C is.

A.3.5atm

B.2atm

C.1atm

D.1. 5atm

6. For an ideal gas, the density is given by:

A.P/RT

B.RT/PM

C.PM/RT

D.M/V

7. Actual volume of gas molecules is negligible at:

A. 20atm

B. 0.5atm

C. 760 torr

D. 5atm

8. Azhar loves to swim in deep water , but when he jumps into water his friend gives him precautions and gives him tank containing ------ to help in breathing

A. 96% H + 4% O2

B.4% N2 + 96% O2

C.50% N2 + 50% O2

D.None of these

9. I have 3 containers filled with three gas ( hydrogen, oxygen,methane) each having different molar mass are placed in sunlight which of the following has max kinetic energy

A.Hydrogen

B.Oxygen

C.Methane

D. K.E is same

10. the value of the universal

gas constant would depend only on:

A.The nature of the gas

B.The pressure of the gas

C. temperature of gas

D.None of these

11. To compress a gas by 1/4 of its original volume, the pressure of gas will be ---- if temperature increases twice

should be:

A. 16P

B. 1/4P

C.8 P

D.2P

12. The intramolecular force attraction between the atoms of hydrogen is:

A.London dispersion force

B.Covalent bond

C.Coordinate covalent bond

D.Hydrogen bonding

13. Which statement is correct?

I) Gases are ideal at high pressure

II) Gases are non ideal at low pressure

III) Gases are ideal at low pressure

IV) Gases are non ideal at high pressure

A.I and II

B.II only

C.I only

D.III and IV

14. CO2 ( dry ice ) molecule will show

A. Rotational K.E

B. Translation K.E

C. Vibrational K.E

D. All of these

15. Joule's Thompson effect explains

A.Heating

B.Liquefaction

C.Solidification

D.Evaporation

16. Rate of diffusion of a gas is ————

a. directly proportional to its density

b. directly proportional to its molecular mass

c. directly proportional to the square of its molecular mass

d. inversely proportional to the square root of its molecular mass

17. Non-ideal gases approach ideal behaviour under:

(a) high temperature and high pressure

(b) high temperature and low pressure

(c) low temperature and high pressure

(d) low temperature and low pressure

18. The kinetic theory of gases predicts that total kinetic energy of gas depends on——–

(a) pressure of the gas

(b) temperature of the gas

(c) volume of the gas

(d) pressure, temperature and volume of the gas

19. Gases deviate from ideal behaviour because molecules————-

A. are colourless

B. are spherical

C. Repel eachother

D. have high speeds

E. None of these

20. The density of a gas A is twice that of gas B. Molecular mass of A is half of the molecular mass of B. The ratio of the partial pressure of A and B is ———

(a) 1/4

(b) 1/2

(c) 4/1

(d) 2/1

21. A gas can be liquefied as ?

A. above its critical temperature

B. at its critical temperature

C. below its critical temperature

D. at any temperature

22. At constant temperature the product of pressure and volume of a given amount of a gas is constant this is ————–.

(a) Gay-Lussac law

(b) Charles’ law

(c) Boyle’s law

(d) None of these

23. Graph of isotherm will be

a) A straight line

b) Circular

c) Parabola

d) Hyperbola

24. If the temperature is increased 1°C the increase in volume will be

a) 273 liters

b) 1 by 273rd of the original volume of the gas

c) 1 liter

d) Hundred liters

25. If the gas has 10 moles what will be the volume of it

a) 22.4 liters

b) 2.24 liters

c) 224 liters

d) 2240

26. Which of the following assumption explains great compressibility of gases?

a) the actual volume of the gas molecules is negligible

b) there is no force of attraction

c) particles are always in random motion

d) different particles have different speeds

27. Collisions of gas molecules are ___________

a) perfectly elastic

b) inelastic

c) always occur in a proper and predicted motion

d) not conserved

28. If i am observing each and every particles of gas then its molecule speed at any instant is

a) same

b) different

c) opposite

d) similar

29. Which of the following is not a postulate of Kinetic molecular theory of gases?

a) the actual volume of gas molecules is negligible

b) there are high forces of attraction between the gas molecules

c) collisions are elastic in gas molecules

d) kinetic energy of gas molecules is directly proportional to the absolute temperature

30. Meterologist used the pressure unit called as

Manometer

Millibar

Barometer

Isobarometer

31. 1900 torr is equal to :

32. Rate of diffusion of two gases is 1:4 then molecular mass of them is

A 16:4

B 16:2

C 16:1

D.8:1

33. Discovery of plasma occur by the same method as the discovery of

A. E N

B. I.P

C. E.A

D. None of these

34. Hassan has two balloons having ideal gas and real gas in it in separate balloons of equal volume and moles. Which of the following balloons will have more chances of burst

A. Real gas

B. Ideal gas

C. Equal chances

D. Never burst

35. Normally the difference of pressure inside aslam's bodyband outside environment at sea level is

A.159 torr

B. 33 torr

C. 53 torr

D. 43 torr

36. If two gas CH4 and SO2 are present what is the weight ratio of SO2 to CH4 is

A. 1:2

B. 1:4

C. 4:1

D. 2:1

37. Which of the following has more critical pressure

A. Ar

B. N2

C. CCL2F2

D. O2

38. Which of the following is used in refrigerator

A. NH3(g)

B. Liquid oxygen

C. Liquid nitrogen

D.( NH3)L

39. Plasma show which colour when nitrogen gas is filled in tube

A. Green

B. Purple

C. Red

D. No colour showed

40. Value of R is determined by which law

A. Boyle's law

B. Charles law

C. Gay lussac's law

D. Avogadro's law

41. Kinetic molecular theory was given by

A. Maxwell and boltzman

B. R.J Clausis

C . Bernouli

D. Maxwell only

42. (a) and ( b) are vander wall constant . Which of the following gases has same value of b

A. CO2 ,O2

B. CH4 , 02

C. NH3, O2

D. CH4, CO2

43. Any gas shows maximum deviation from ideal gas at:

A. 500°C and 1 atmospheric pressure

B.100°C and 2 atmospheric pressure

C. –100°C and 5 atmospheric pressure

D. 0°C and 1 atmospheric pressure

44. Absolute zero is defined as the temperature.

A.At which ideal gases becomes real gases

B.At which liquid helium boils

C.At which all molecular motion of real gas ceases

D.All of these

45. The density of a gas at 0°C and 1atm is Y. if pressure is 10atm at which of

the following temperatures will its density become 5y.

A. 273K

B. 1092 C°

C. 1092k

D. 546K

46. At what pressure will a quantity of gas, which occupies 500mL at a

pressure of 1440mm, occupy a volume of 50mL

A.360mm

B.1440mm

C.760mm

D.14400mm

47. An ideal gas will have maximum density when:

A.P = 3atm, T = 200K

B.P = 0.7atm, T = 500K

C.P = 2.0atm, T = 600K

D.P = 1.5atm, T = 400K

48. isotherm is a graph between:

A.T and P

B.T and V

C.P and V

D.n and T

49. Standard pressure is

A. 760 torr

B. 1atm

C. 14.7 Psi

D. All of these

50. Which of the following gas cannot be liquified by lind's method

A. 2H

B. He

C. Ne

D. A and B