XI Chemistry States Of Matter: Gases Online Test Mdcat-2024

Instructions for Chapter States Of Matter: Gases Online Test Mdcat-2024:

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Test Details:

Subject: Chemistry
Class: 1st year or 11
Chapter name: States Of Matter: Gases
Test: MDCAT 2024
Book: Sindh Textbook
Total No. Of MCQS: 50
Time Allowed: 50 Minutes
Price : Free

604

Created on May 27, 2024 By

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XI Chemistry States Of Matter:Gases Online Test Mdcat-2024

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NameEmailPhone Number

1 / 50

1. The graph that shows the relationship between volume and temperature of a gas at constant pressure is called:

a) Isotherm

b) Isobar

c) Isochore

d) none

2 / 50

2. Absolute zero temperature regarded as that temperature at which

a) All liquid becomes gases

b) All substance are solids

c) Molecular motion in a gas would cease

d) Water freezes

3 / 50

3. Which of the following is the lowest possible temperature?

a) 0 K

b) 0°C

c) 0°F

d) -273 K

4 / 50

4. Which of the following is known as standard temperature and pressure (STP)

a) 0 K and 1 atm

b) 0°C and 760 torr

c) 0°F and 760 atm

d) 273 K & 25 atm

5 / 50

5. The value of R (Gas constant), when pressure is expressed in N/m²(Newton per square metre)

a) 0.0821 dm³ Atmosphere

b) 8.3143 J.K^-1 mole^-1

c) 8.213 dm3 Atmosphere K^-1 mole^-1

d) 9.8 joule K^-1 mole^-1

6 / 50

6. The volume of gas would theoretically be zero at:

a) O°C

b) OK

c) 273K

d) 273°C

7 / 50

7. In S.I. system, the unit of pressure is:

a) Kg/ms²

b) Kg/ms

c) Kg/m

d) Kg/m².s

8 / 50

8. The vapour pressure of water at 100°C is:

a) 760 torr

b) 760 atm

c) 76 torr

d) 76 atm

9 / 50

9. Which of the following is not associated with the general gas equation?

a) PV/T = R (for 1 mole)

b) ρ=PM/RT (ρ=Density)

c) PV= (m/M) RT

d) R = nT/PV

10 / 50

10. A gas at zero Kelvin:

a) Is super cooled

b) Freezes

c) Has zero volume

d) Has infinite volume

11 / 50

11. Gases bubbles through liquids because

a) Gases have low densities

b) Gases are more common than liquids

c) Gases take up the volume of the whole container

d) Gases experience Joule – Thomson effect

12 / 50

12. Joule Thomson effect is defined as:

a) Cooling happens when contraction of gas takes place

b) Cooling happens when expansion of gas takes place

c) Heating happens when expansion of gas takes place

d) Heating happens when contraction of gas takes place

13 / 50

13. Which statement is true regarding states of matter

a) Plasma is not a state of matter

b) There are only three states of matter

c) Liquids are more common than solids

d) Liquid state of any substance can exist only within a narrow range of temperature and pressure

14 / 50

14. Very small values of Van der Waal’s constant in his equation for a particular gas show that:

a) The molecules of the gas are big sized

b) Gas is sufficiently polar

c) Least attractive forces are present among the molecules of the gas

d) The gases are non-ideal

15 / 50

15. The ideal gas equation is also called the equation of states because:

a) It depends on states of matter

b) It is a relation between four variables and describes the state of any gas

c) It is combination of various gas laws and any variable can be calculated

d) It is applicable to only ideal gases under STP conditions

16 / 50

16. For Ideal gases Isotherm refers to the:

a) Gases at same temperature

b) Gases at same pressure

c) Gases having same heat capacities

d) Plot of P vs V , at constant T

17 / 50

17. The main reason for deviaation of gases from ideal behavior is few assumptions KMT these are ?
I)There is no force of attraction between the molecules of a gas
II)Volume of the molecules of a gas is negligibly small in comparison to the volume of the gas
III)Particles of a gas are always in constant random motion

a) I & II

b) II & III

c) I,II & III

d) III only

18 / 50

18. An ideal gas cannot be liquefied because:

a) Its critical temperature is always above 0⁰C

b) Its molecules are relatively small in size

c) It solidifies before becoming liquid

d) Forces operating between ots molecules are negligible

19 / 50

19. Correct relation for molecular mass of a gas is

a) M=mRT/PV

b) M= RT/mPV

c) M=mPV/RT

d) M=PV/mRT

20 / 50

20. If value of PV/RT>1 for a gas.Hence:

a) There are no attractive or repulsive forces between molecules

b) Forces of attraction are stronger than forces of repulsion

c) Forces of attraction are weaker than forces of repulsion

d) None of these

21 / 50

21. According to Boyles Law PV=K, where K is constant of proportionality & its value depends upon:

a) Nature of gas

b) Pressure of gas

c) Volume of gas

d) Amount of gas

22 / 50

22. Which gas always show positive deviation from ideal behavior?

a) He

b) CH₄

c) H₂

d) Both A & C

23 / 50

23. Which of the following relation is incorrect?

a) P₁V₁T₂=P₂V₂T₁

b) V₁T₂=V₂T₁

c) P₁/V₁=P₂/V₂

d) None

24 / 50

24. Which of the following does not express the properties of gases?

a) Gases are highly compressible

b) Gases exert pressure equally in all directions

c) Gases have much higher density than liquids and solids

d) Gases mix evenly and completely in all proportions

25 / 50

25. 7g of a gas at a temperature of 273⁰C &pressure of 0.5atm has volume 22.4 liter. The molecular formula of gas is :

a) CO

b) C₂H₄

c) N₂

d) All of these

26 / 50

26. Graph between which of the following variables is not a straight line

a) V & P

b) V & 1/P

c) V & T

d) P & T

27 / 50

27. Helium gas is compressed to half of the volume at 303K. It should be heated to which temperature for its volume to increase to double of its original volume ?

a) 303K

b) 606K

c) 1212K

d) 600⁰C

28 / 50

28. If value of a and b are more in vander waals equation than :

a) Deviation is more

b) Deviation is less

c) Deviation is independent of a and b

d) None

29 / 50

29. Value of R ( Universal gas constant ) depends upon

a) Nature of gas

b) Unit of measurement

c) Both A and C

d) None of these

30 / 50

30. Sudden expansion of gases causes cooling, this is called :

a) Stark effect

b) Linde Effect

c) Joule-Thomson effect

d) Vander waal effect

31 / 50

31. Select the correct statement :

a) Real gases exert more pressure than Ideal gases

b) Non-Polar gases have high force of attraction than polar gases

c) Non-Polar gases show more ideal behavior than real gases

d) Both A & C

32 / 50

32. The order of rate of diffusion of gases NH₃,SO₂,Cl₂ and CO₂ is:

a) NH₃> SO₂>Cl₂>CO₂

b) Cl₂>SO₂>CO₂>NH₃

c) NH₃>CO₂>SO₂>Cl₂

d) NH₃>CO₂>Cl₂>SO₂

33 / 50

33. Which one of the following is not postulated in kinetic molecular theory of gases :

a) Molecules of all the gases haves same size and same mass

b) Molecules are in random motion

c) All molecular collisions are elastic

d) The volume of the molecules is negligible

34 / 50

34. Which of the following is not the property of plasma :
I)It is influenced by E.F and M.F . II)Particles of plasma has neither definite shape nor volume
III)Plasma as a whole is neutral
IV)It does not shows and characteristic glow in discharge tube

a) I & IV

b) III

c) I only

d) IV only

35 / 50

35. Select the correct choice :

a) All gases have same critical temperature and critical pressure

b) When a compressed gas is allowed to enter from region of low pressure to a high pressure through a nozzle, it expands and causes fall in temperature =Joule Thomson effect

c) Liquefaction is a chemical process

d) None of them is correct

36 / 50

36. “SCUBA” used by sea divers contains :

a) 96% oxygen and 4% Helium

b) 96% oxygen and 4% Hydrogen

c) 96% Helium and 4% Hydrogen

d) 96% Helium and 4% Oxygen

37 / 50

37. What is the partial pressure of oxygen in lungs?

a) 760 torr

b) 116 torr

c) 159 torr

d) 1 torr

38 / 50

38. What is the partial pressure of oxygen in the air?

a) 760 torr

b) 116 torr

c) 159 torr

d) 1 torr

39 / 50

39. Which of the following are the applications of Dalton's Law of partial pressure
I)Pressure of gases collected over water
II)Maintenance of oxygen pressure at high altitudes
III)Maintenance of oxygen pressure for deep sea divers

a) I only

b) II and III only

c) I and III only

d) I,II,&III

40 / 50

40. Density of a gas having molar mass ’M’ at pressure ‘P’ & Temperature ‘T' is given by : d=PM/RT. What will be the density of a gas having molar mass ‘2M’ at Pressure 2P and temperature 2T

a) d/2

b) 2d

c) d/4

d) 4d

41 / 50

41. Product of Pressure and Volume is always constant is the statement of:

a) Boyle’s Law

b) Charles’s Law

c) Dalton’s Law

d) Avogadro’s Law

42 / 50

42. Van der Waal’s real gas, acts as an ideal gas, at which condition?

a) High temperature, low pressure

b) Low temperature, high pressure

c) High temperature, high pressure

d) Low temperature, low pressure

43 / 50

43. Gases behaves like ideal at

a) Low heat

b) High temperature

c) High Pressure

d) Low temperature

44 / 50

44. All statements are correct except:

a) At high pressure and low temperature gases behave non-ideally

b) All the gas laws have no significance for real gases

c) Any gas can never be 100% ideal

d) The value of compressibility factor is changed by changing pressure and temperature for an ideal gas

45 / 50

45. Which gas is likely to be the most ideal?

a) H2S

b) NH3

c) CH4

d) Ne

46 / 50

46. The value of compressibility factor for an ideal gas is:

a) Zero

b) Fraction

c) Unity

d) None of given

47 / 50

47. The Vander Waal’s equation for real gas is?

a) (P + a²n/v²)(v –nb)=nRT

b) (P + a/v²)(V+B)=nRT

c) (P + an²/v²)(v-nb)= nRT

d) None of these

48 / 50

48. Gases deviate from ideal behavior at high pressure. Which of the following is correct for nonideality?

a) At high pressure, the collision between the gas molecules becomes enormous

b) At high pressure, the gas molecules move only in one direction

c) At high pressure, the volume of gas becomes insignificant

d) At high pressure, the intermolecular interaction become significant

49 / 50

49. 32.8 psi is equal to how many atm?

a) 1 atm

b) 2 atm

c) 2.23 atm

d) 2.5 atm

50 / 50

50. 1 Pascal is equal to

a) 1.01325 Bar

b) 76cm Hg

c) 101325 N/m²

d) 1 N/m²

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Instructions for Chapter States Of Matter: Gases Online Test Mdcat-2024:

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