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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. 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

None of these

3.6 L

29, 700 L

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

Low density

Attraction with air

Diffusion

Effusion

3. Which of the following statements is false?

Avogadro number = 6.02 x 10²¹

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

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

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

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

Charles’ law

Partial law of volumes

Perfect gas law

Ideal gas equation

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

None of these

3.25 L

3.15L

312,480 L

6. 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

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

Low temperature

B and C

High pressure

High temperature

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

HCl and NH₃

CH₄ and C₂H₆

CO and CO₂

CO₂ and N₂

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

Directly proportional

Inversely proportional

Unrelated

None of these

10. The gases become non-ideal at

High temperature and high pressure

Low temperature and high pressure

High temperature and Low pressure

Low temperature and Low pressure

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

Beat up

React

Cool down

Move randomly

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

0.1526 atm

116 mm of Hg

1 atm

116 torr

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

Carbon Dioxide

Ice Cubes

Motion of a Car

Copper (II) nitrate

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

Curie point

Critical temperature

Inversion temperature

Neutral temperature

15. The diffusion of gases at absolute zero will be

Slightly decreased

Zero

Unchanged

Slightly increased

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

Physical property

Chemical property

Chemical Change

Physical Change

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

Hydrophobic bonds

Hydrogen bonds

Vander Waal’s forces

Covalent bonds

18. 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.

It cannot be liquefied at any value of P and T

Its pressure is more than critical pressure

Its temperature is more than critical temperature

19. CuSO₄ is dissolved in water

Chemical Change

Physical Change

Chemical Property

Physical Property

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

97.1 atm

96.7 atm

98.5 atm

95.8 atm

21. According to kinetic theory of gases there are

Molecules which have considerable volume

No intermolecular forces of attraction

Intermolecular attractions

The velocity of molecules decreases for each collision.

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

1.94 L

1.6 L

None of these

1.5 L

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

None of these

No comparison

Multiples equal

Different

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

Normal temperature

Absolute temperature

Standard temperature

Critical temperature

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

Cl₂

N₂O

H₂S

Page 2 of 3

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

None of these

The gases are NOT fluid

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

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

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

273 c and 760 mm Hg

273 k and 760 mm Hg

273 k and 76 mm Hg

273 c and 76 mm Hg

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

Osmotic pressure

Vapour pressure

Partial pressure

Atmospheric pressure

29. A pressure of 1Nm¯² is equal to

One atmosphere

One bar

One Pascal

Stalagmometer

30. 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

31. 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

Avogadro’s law

Dalton’s law

Boyle’s law

32. The specific heat of an ideal gas is

Proportional to T²

Proportional to T³

Independent of T

Proportional to T

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

Avogadro’s law

Grahams law

Daltons law

Charles law

34. Which state of matter has the lowest density?

Solid

Gas

Plasma

Liquid

35. 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

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

Graham’s law

Hook’s law

Boyle’s law

Charles’ law

37. Which is incorrect in case of ideal gases

All molecules move with same speed

Can be liquefied

PV/RT = n

Behave independently

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

PRT

P/RT

PT/R

RT/P

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

Aqueous tension

Vapor pressure

Hydraulic pressure

Surface tension

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

CHl and NH₃

CO and CO₂

CH₄ and C₂H₆

CO₂ and N₂

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

Avogadro’s law

Dalton’s law

Boyl’s law

Charle’s law

42. Which state of matter has lowest density?

Solid

Liquid

Plasma

Gas

43. Milk turns sour. This is a

Physical Change

Physical Property

Chemical Change

Chemical Property

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

Chemical Change, Physical Change

Physical property, Chemical Change

Physical Change, Chemical Change

Chemical property, Physical Change

45. At constant volume temperature is increased then

Collision will not change

Collision will be in straight line

Collision on walls will be less

Collision frequency will be increases

46. Average kinetic energy of molecules is

Inversely proportional to absolute temperature

Independent of absolute temperature

Directly proportional to absolute temperature

Directly proportional to square root of temperature

47. Liquefaction of gas can only be carried out if

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

The temperature is more than critical and pressure is 1000 atm

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

Molar volume

Atomic volume

Normal volume

Total volume

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

Doubled

Halved

Same as before

√927/27 times the earlier value

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

Hyperbola

Curve

Parabola

Straight line

Page 3 of 3

51. 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

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

Boltzman

Chales

Clausius

Vander Waal

53. Lind’s method is employed to

Expansion of gas

Liquefaction of gases

Compression of gases

Separation of gases

54. 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

55. 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?

300 K

20°C

400 K

30°C

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

Divided by the total pressure

Added to the total pressure

Subtracted from the total pressure

Multiplied to the total pressure

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

6.17 x 10¯²⁰ J

7.16 x 10¯²⁰ J

6.17 x 10¯²¹ kJ

6.17 x 10¯²¹ J

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

In a straight line path

Ina circular path

In a wavy path

With an accelerated velocity

59. An ideal gas cannot be liquefied because

Its molecules are relatively small in size

It solidifies before becoming a liquid

Its critical temperature is always above 0°C

Forces operative between its molecules are negligible

60. 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 atm

None of these

.66 kPa

4.125 atm

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

Decrease

Increase a little, then decrease.

Increase

None of these

62. The specific heat of a gas

Has two values Cp and Cv

Is proportional to the square root of its absolute temperature

Has only one value

Can have any value between 0 and infinity

63. 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?

None of these

2.06 L

1.97 L

186,000 L

64. 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).

1.49 L

None of these

1.65 L

1.25 L

65. 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?

All of these

247.2 K (Which equals -25.8C)

386 K (which equals 113.25 C)

61.8 K (Which equals -211.2 C)

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

64 gmol¯¹

16 gmol¯¹

48 gmol¯¹

32 gmol¯¹

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

Charles’s law

Avogadro’s law

Dalton’s law

Graham’s law

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

All molecules behave independently

PV/RT = n

All molecules move with same speed

All gases cannot be liquefied through Lind’s Method

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

0.082 liter-atm¯¹ K mol

0.082 liter-atm¯¹ K mol¯¹

0.082 liter-atm K

0.082 liter-atm K¯¹ mol¯¹

70. 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 high pressure

At high temperature and high pressure

At low temperature and low pressure

71. One mole of a gas refers to

The number of molecules in one liter of gas

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 gram of gas

72. Volume of gas become four times if

Temperature becomes two times at constant pressure

Temperature become one fourth at constant pressure

Temperature become four times at constant pressure

Temperature becomes half at constant pressure

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

Temperature and pressure both are increased

Temperature is lowered and pressure is increased

Temperature is increased and pressure is decreased

Temperature and pressure are both lowered

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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

Chemistry

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