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ECAT Chemistry Forms of Matter Test Online

Mustansar KhanLast Updated: April 19, 2025

Chemistry Forms of Matter MCQS Online Test

ECAT Chemistry Forms of Matter Chapter Online Test

Total Questions:	73
Time Allowed:	40 Minutes
Total Marks:	73
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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ECAT Chemistry Forms of Matter Test

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Page 1 of 3

Chemistry

1. The diffusion of gases at absolute zero will be

Unchanged

Zero

Slightly decreased

Slightly increased

2. The kinetic theory of gases predicts that total kinetic energy of a gaseous assembly depends on

Volume of the gas

Temperature of the gas

Pressure, temperature, and volume of the gas

Pressure of the gas

3. The gases become non-ideal at

Low temperature and Low pressure

High temperature and high pressure

Low temperature and high pressure

High temperature and Low pressure

4. Standard temperature and pressure of a gas refers to as

273 c and 76 mm Hg

273 c and 760 mm Hg

273 k and 760 mm Hg

273 k and 76 mm Hg

5. One mole of a gas refers to

The number of molecules contained in 12 grams of ¹²C isotope

The number of molecules in 22.4 liters of a gas at S.T.P.

The number of molecules in one liter of gas

The number of molecules in one gram of gas

6. The temperature below which a gas does not exist is called its

Neutral temperature

Critical temperature

Curie point

Inversion temperature

7. At constant temperature, volume of given mass of gas is inverse proportional to pressure on it. This statement is according to

Hook’s law

Boyle’s law

Graham’s law

Charles’ law

8. Equal volumes of gases at the same temperature and pressure contain equal number of particles. This statement is direct consequence of

Partial law of volumes

Charles’ law

Ideal gas equation

Perfect gas law

9. Which of the following is not considered as an intermolecular force between molecules?

Vander Waal’s forces

Hydrophobic bonds

Hydrogen bonds

Covalent bonds

10. What will be the pressure of 1 mole of an ideal gas maintained at 300 K and 250cm³ volume?

95.8 atm

97.1 atm

96.7 atm

98.5 atm

11. The average kinetic energy of an ideal gas per molecule is SI units at 25°C will be

7.16 x 10¯²⁰ J

6.17 x 10¯²⁰ J

6.17 x 10¯²¹ kJ

6.17 x 10¯²¹ J

12. Liquefaction of gas can only be carried out if

The temperature is more than critical and pressure is 1000 atm

Temperature is above the critical temperature and pressure can have any value

Without caring for the value critical volume at critical stage

The temperature is below the critical and pressure is very high

13. Average kinetic energy of molecules is

Directly proportional to absolute temperature

Inversely proportional to absolute temperature

Independent of absolute temperature

Directly proportional to square root of temperature

14. According to kinetic theory of gases there are

The velocity of molecules decreases for each collision.

No intermolecular forces of attraction

Intermolecular attractions

Molecules which have considerable volume

15. An ideal gas obeying kinetic gas equation can be liquefied if

Its pressure is more than critical pressure but temperature is less than critical temperature.

Its temperature is more than critical temperature

Its pressure is more than critical pressure

It cannot be liquefied at any value of P and T

16. The kinetic theory of gases, which of the following is important for an ideal gas:

There is no attraction or repulsion between the gas molecules, whereas there IS attraction between molecules of liquids or solids.

The gases are NOT fluid

The distance between molecules in ideal gases is closer than in liquids or solids.

None of these

17. The total pressure exerted by a number of non reacting gases is equal to the sum of partial pressure of the gases under the same conditions is known as

Charle’s law

Boyle’s law

Dalton’s law

Avogadro’s law

18. The gases suddenly __________ if these are allowed to expand

Move randomly

React

Beat up

Cool down

19. Which one is the correct value of R

0.082/dtm Cm³ K¯¹ mol¯¹

0.082/dm³ atom K¯¹ mol¯¹

0.082/dm³ torr K¯¹ mol¯¹

0.082/Cm³ torr K¯¹ mol¯¹

20. Which of the following option is incorrect about gases?

All molecules behave independently

All molecules move with same speed

All gases cannot be liquefied through Lind’s Method

PV/RT = n

21. A pressure of 1Nm¯² is equal to

One Pascal

One atmosphere

Stalagmometer

One bar

22. Lind’s method is employed to

Expansion of gas

Compression of gases

Separation of gases

Liquefaction of gases

23. The specific heat of a gas

Can have any value between 0 and infinity

Has only one value

Has two values Cp and Cv

Is proportional to the square root of its absolute temperature

24. Volume of gas become four times if

Temperature become one fourth at constant pressure

Temperature becomes half at constant pressure

Temperature become four times at constant pressure

Temperature becomes two times at constant pressure

25. Which of the following are NOT examples of matter?

Copper (II) nitrate

Motion of a Car

Ice Cubes

Carbon Dioxide

Page 2 of 3

26. Which is incorrect in case of ideal gases

All molecules move with same speed

PV/RT = n

Behave independently

Can be liquefied

27. Which of the following statements is false?

The relationship between average velocity (v) and root mean square velocity (u) is v = 0.9213 u

Avogadro number = 6.02 x 10²¹

The mean kinetic energy of an ideal gas is independent of the pressure of the gas

The root mean square velocity of the gas can be calculated by the formula (3RT/M)

28. Gas in a balloon occupies 3.3 L. What volume will it occupy if the pressure is changed from 100 kPa to 90 kPa (at constant temperature of 310 K (about room temperature),

2.97 L

3.6 L

None of these

29, 700 L

29. Which one is not the partial pressure of oxygen in the lungs?

116 torr

0.1526 atm

1 atm

116 mm of Hg

30. Which of these gases diffuses more quickly than oxygen?

Cl₂

H₂S

N₂O

31. Air at sea level is dense. This is practical application of

Charle’s law

Avogadro’s law

Boyl’s law

Dalton’s law

32. CuSO₄ is dissolved in water

Chemical Change

Physical Property

Chemical Property

Physical Change

33. The partial pressure exerted by the water vapors is called

Surface tension

Hydraulic pressure

Vapor pressure

Aqueous tension

34. The processes of effusion and diffusion are best understand by

Avogadro’s law

Grahams law

Charles law

Daltons law

35. A balloon occupies 3.2 L at 37°C. How much will it occupy at 42°C?

3.15L

3.25 L

None of these

312,480 L

36. There is more deviation in the behavior of a gas from the ideal gas equation PV – nRT

At high temperature and low pressure

At low temperature and low pressure

At low temperature and high pressure

At high temperature and high pressure

37. What is the final pressure in a balloon when the volume is changed from 1.5 L to a volume of 2.5L at constant temperature? (Initial pressure is 1.1 atm).

.66 kPa

.66 atm

None of these

4.125 atm

38. What is the final pressure in a vessel when the volume is changed from 1.3 L to a volume of 1.55 L at constant temperature? (Initial pressure is 1.5 atm).

1.25 L

None of these

1.65 L

1.49 L

39. To which mixture of gases Dalton’s law of partial pressure is not applicable

CO and CO₂

CH₄ and C₂H₆

CHl and NH₃

CO₂ and N₂

40. Ideal gasses have all the following characteristics except.

Absence of intermolecular forces

The molecules occupy no space

Collisions among the molecules of an ideal gas are perfectly elastic

All of the above are correct

41. If 1/v is plotted on X-axis and pressure on y-axis at constant temperature, what should appear

Hyperbola

Curve

Parabola

Straight line

42. The volume of a gas that is occupied by its one mole at S.T.P is known as

Atomic volume

Molar volume

Normal volume

Total volume

43. The light temperature at which a substance can exist as a liquid is called its

Critical temperature

Standard temperature

Absolute temperature

Normal temperature

44. A gas expands from a volume 2.0 L at 36°C to a volume of 2.5 L, what is the final temperature, if the pressure is constant?

61.8 K (Which equals -211.2 C)

All of these

386 K (which equals 113.25 C)

247.2 K (Which equals -25.8C)

45. Who made volume and pressure correction to explain deviation of gases from ideal behavior?

Boltzman

Chales

Vander Waal

Clausius

46. How should the conditions be changed to prevent the volume of a given gas from expanding when its mass increased?

Temperature is increased and pressure is decreased

Temperature is lowered and pressure is increased

Temperature and pressure are both lowered

Temperature and pressure both are increased

47. Which of the following describes the relationship between P and V?

Directly proportional

None of these

Unrelated

Inversely proportional

48. If the air inside a balloon is heated, the volume will

None of these

Increase

Increase a little, then decrease.

Decrease

49. The spreading of fragrance or scent in air is due to

Effusion

Attraction with air

Diffusion

Low density

50. Equal volume of all gases at same temperature and pressure contain number of molecules

None of these

Different

No comparison

Multiples equal

Page 3 of 3

51. The correct value of the gas constant R is close to

0.082 liter-atm K

0.082 liter-atm¯¹ K mol¯¹

0.082 liter-atm K¯¹ mol¯¹

0.082 liter-atm¯¹ K mol

52. A balloon occupies a volume of 2.0 L at 40°C. How much volume will it occupy at 30°C?

1.5 L

1.94 L

1.6 L

None of these

53. Aluminum Phosphate has a density of 2.566 g/cm3

Chemical Change

Chemical property

Physical property

Physical Change

54. An ideal gas cannot be liquefied because

Its molecules are relatively small in size

Its critical temperature is always above 0°C

It solidifies before becoming a liquid

Forces operative between its molecules are negligible

55. Under what conditions the gases deviate from the ideal behavior?

Low temperature

B and C

High temperature

High pressure

56. The which of the following mixtures Dalton’s law of partial pressures is not applicable?

HCl and NH₃

CO₂ and N₂

CO and CO₂

CH₄ and C₂H₆

57. A gas occupies a balloon with a volume 2.0.1, at 33°C. How much volume will it occupy at 37°C, if pressure remains constant?

2.06 L

None of these

1.97 L

186,000 L

58. Hydrogen effuses four times more rapidly than volume of an unknown gas molar mass of unknown gas should be

48 gmol¯¹

64 gmol¯¹

32 gmol¯¹

16 gmol¯¹

59. The specific heat of an ideal gas is

Proportional to T

Proportional to T²

Independent of T

Proportional to T³

60. The respiration process taking place in animals depends upon a difference in

Osmotic pressure

Atmospheric pressure

Partial pressure

Vapour pressure

61. The process of effusion and diffusion are best understood by

Graham’s law

Charles’s law

Avogadro’s law

Dalton’s law

62. To measure the true pressure of a gas collected over water, the pressure due to water vapours is

Added to the total pressure

Subtracted from the total pressure

Multiplied to the total pressure

Divided by the total pressure

63. At constant volume temperature is increased then

Collision will be in straight line

Collision frequency will be increases

Collision on walls will be less

Collision will not change

64. For an ideal gas, number of moles per liter in terms of its pressure P, gas constant R and temperature T is

PRT

RT/P

PT/R

P/RT

65. HCl being a strong acid is a _________. Wood sawed in two is __________.

Physical Change, Chemical Change

Chemical Change, Physical Change

Physical property, Chemical Change

Chemical property, Physical Change

66. Which state of matter has lowest density?

Solid

Gas

Liquid

Plasma

67. The non-ideal behavior results chiefly from

Intermolecular attractions and finite volume

Intermolecular attraction and infinite volume

Intermolecular attraction only

Elastic collisions and finite volume

68. A gas has non-ideal behavior at

High temperature and low pressure

Low temperature and high pressure

High temperature and high pressure

Low temperature and low pressure

69. According to the kinetic theory of gases, in an ideal gas, between two successive collisions a gas molecule travels

In a straight line path

In a wavy path

Ina circular path

With an accelerated velocity

70. The temperature of the gas is raised from 27°C to 927°C, the root mean square velocity is

Halved

Same as before

Doubled

√927/27 times the earlier value

71. The density of a gas at 27°C and 1 atm is d. Pressure remaining constant, at which of the following temperatures will its density become 0.75 d?

20°C

400 K

30°C

300 K

72. Which state of matter has the lowest density?

Plasma

Gas

Liquid

Solid

73. Milk turns sour. This is a

Physical Change

Chemical Property

Chemical Change

Physical Property

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Mustansar KhanLast Updated: April 19, 2025

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ECAT Chemistry Forms of Matter Test Online

Chemistry Forms of Matter MCQS Online Test

ECAT Chemistry Forms of Matter Chapter Online Test

ECAT Chemistry Forms of Matter Test

Chemistry

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Chemistry Forms of Matter MCQS Online Test

ECAT Chemistry Forms of Matter Chapter Online Test

ECAT Chemistry Forms of Matter Test

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