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Chemistry Forms of Matter Test Online

Mustansar KhanLast Updated: October 14, 2025

Important Chemistry Forms of Matter Question and Answer

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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Chemistry Forms of Matter Practice Test Online With Explanation

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Page 1 of 3

Chemistry

1. Average kinetic energy of molecules is

Directly proportional to absolute temperature

Independent of absolute temperature

Inversely proportional to absolute temperature

Directly proportional to square root of temperature

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

Critical temperature

Neutral temperature

Inversion temperature

Curie point

3. 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),

29, 700 L

None of these

3.6 L

2.97 L

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

1.6 L

None of these

1.94 L

1.5 L

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

Chales

Vander Waal

Boltzman

Clausius

6. 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

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

Directly proportional

None of these

Inversely proportional

Unrelated

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

Atomic volume

Total volume

Normal volume

Molar volume

9. According to kinetic theory of gases there are

Molecules which have considerable volume

The velocity of molecules decreases for each collision.

No intermolecular forces of attraction

Intermolecular attractions

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

Its temperature is more than critical temperature

Its pressure is more than critical pressure

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

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

Hydraulic pressure

Surface tension

Vapor pressure

Aqueous tension

12. Which state of matter has the lowest density?

Solid

Liquid

Plasma

Gas

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

Diffusion

Low density

Attraction with air

Effusion

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

Cl₂

H₂S

N₂O

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

Temperature and pressure are both lowered

Temperature is lowered and pressure is increased

Temperature is increased and pressure is decreased

Temperature and pressure both are increased

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

0.082 liter-atm¯¹ K mol¯¹

0.082 liter-atm K¯¹ mol¯¹

0.082 liter-atm K

0.082 liter-atm¯¹ K mol

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

Partial pressure

Atmospheric pressure

Osmotic pressure

Vapour pressure

18. The specific heat of a gas

Has two values Cp and Cv

Has only one value

Can have any value between 0 and infinity

Is proportional to the square root of its absolute temperature

19. The non-ideal behavior results chiefly from

Elastic collisions and finite volume

Intermolecular attraction and infinite volume

Intermolecular attractions and finite volume

Intermolecular attraction only

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

None of these

3.25 L

312,480 L

3.15L

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

Parabola

Curve

Straight line

Hyperbola

22. CuSO₄ is dissolved in water

Physical Property

Chemical Change

Chemical Property

Physical Change

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

Physical Change

Chemical Change

Chemical property

Physical property

24. 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

1.25 L

1.65 L

25. Volume of gas become four times if

Temperature become four times at constant pressure

Temperature becomes half at constant pressure

Temperature becomes two times at constant pressure

Temperature become one fourth at constant pressure

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

Perfect gas law

Charles’ law

Partial law of volumes

Ideal gas equation

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

32 gmol¯¹

64 gmol¯¹

48 gmol¯¹

16 gmol¯¹

28. The diffusion of gases at absolute zero will be

Zero

Slightly increased

Unchanged

Slightly decreased

29. 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?

247.2 K (Which equals -25.8C)

386 K (which equals 113.25 C)

All of these

61.8 K (Which equals -211.2 C)

30. Milk turns sour. This is a

Physical Change

Chemical Change

Physical Property

Chemical Property

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

Subtracted from the total pressure

Divided by the total pressure

Multiplied to the total pressure

Added to the total pressure

32. A gas has non-ideal behavior at

High temperature and high pressure

High temperature and low pressure

Low temperature and low pressure

Low temperature and high pressure

33. Which one is the correct value of R

0.082/dm³ torr K¯¹ mol¯¹

0.082/dm³ atom K¯¹ mol¯¹

0.082/dtm Cm³ K¯¹ mol¯¹

0.082/Cm³ torr K¯¹ mol¯¹

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

Avogadro’s law

Graham’s law

Charles’s law

Dalton’s law

35. One mole of a gas refers to

The number of molecules in one liter of gas

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

The number of molecules in one gram of gas

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

36. 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?

1.97 L

None of these

186,000 L

2.06 L

37. Which of the following statements is false?

Avogadro number = 6.02 x 10²¹

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

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)

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

Temperature of the gas

Pressure, temperature, and volume of the gas

Pressure of the gas

Volume of the gas

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

In a wavy path

In a straight line path

With an accelerated velocity

Ina circular path

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

Avogadro’s law

Boyl’s law

Charle’s law

Dalton’s law

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

Daltons law

Avogadro’s law

Charles law

Grahams law

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

6.17 x 10¯²¹ kJ

6.17 x 10¯²⁰ J

7.16 x 10¯²⁰ J

6.17 x 10¯²¹ J

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

CO₂ and N₂

CH₄ and C₂H₆

HCl and NH₃

CO and CO₂

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

Increase a little, then decrease.

Increase

Decrease

None of these

45. 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

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

Motion of a Car

Ice Cubes

Carbon Dioxide

Copper (II) nitrate

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

PV/RT = n

All gases cannot be liquefied through Lind’s Method

All molecules behave independently

All molecules move with same speed

48. An ideal gas cannot be liquefied because

Forces operative between its molecules are negligible

Its critical temperature is always above 0°C

It solidifies before becoming a liquid

Its molecules are relatively small in size

49. 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

None of these

.66 atm

4.125 atm

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

Chemical property, Physical Change

Chemical Change, Physical Change

Physical property, Chemical Change

Physical Change, Chemical Change

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

√927/27 times the earlier value

Doubled

Same as before

Halved

52. 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

Boyle’s law

Charle’s law

Avogadro’s law

Dalton’s law

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

RT/P

PT/R

P/RT

PRT

54. The gases become non-ideal at

Low temperature and high pressure

Low temperature and Low pressure

High temperature and high pressure

High temperature and Low pressure

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

At low temperature and low pressure

At high temperature and low pressure

At high temperature and high pressure

At low temperature and high pressure

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

Beat up

Move randomly

React

Cool down

57. Ideal gasses have all the following characteristics except.

All of the above are correct

Collisions among the molecules of an ideal gas are perfectly elastic

The molecules occupy no space

Absence of intermolecular forces

58. A pressure of 1Nm¯² is equal to

One atmosphere

One Pascal

One bar

Stalagmometer

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

116 torr

1 atm

0.1526 atm

116 mm of Hg

60. 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

61. The specific heat of an ideal gas is

Proportional to T

Independent of T

Proportional to T³

Proportional to T²

62. 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?

400 K

30°C

20°C

300 K

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

High temperature

Low temperature

B and C

High pressure

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

Hydrophobic bonds

Covalent bonds

Hydrogen bonds

Vander Waal’s forces

65. 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

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

CH₄ and C₂H₆

CO₂ and N₂

CO and CO₂

CHl and NH₃

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

None of these

No comparison

Multiples equal

Different

68. At constant volume temperature is increased then

Collision will be in straight line

Collision will not change

Collision frequency will be increases

Collision on walls will be less

69. Which state of matter has lowest density?

Gas

Plasma

Solid

Liquid

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

Critical temperature

Normal temperature

Standard temperature

Absolute temperature

71. Which is incorrect in case of ideal gases

PV/RT = n

Behave independently

Can be liquefied

All molecules move with same speed

72. Lind’s method is employed to

Expansion of gas

Compression of gases

Liquefaction of gases

Separation of gases

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

Boyle’s law

Graham’s law

Hook’s law

Charles’ law

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Mustansar KhanLast Updated: October 14, 2025

Chemistry Forms of Matter Test Online

Important Chemistry Forms of Matter Question and Answer

Chemistry Forms of Matter Practice Test Online With Explanation

Chemistry

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