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.
Test Helpful For:	Chemistry Test ECAT Test MDCAT Test FPSC/PPSC/SPSC/KPPSC/BPSC/AJKPSC/NTS Chemistry Interview Question Answer

Chemistry Forms of Matter Practice Test Online With Explanation

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Page 1 of 3

Chemistry

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

Physical Change

Chemical Change

Physical property

Chemical property

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

Vapour pressure

Atmospheric pressure

Osmotic pressure

Partial pressure

3. 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

Avogadro’s law

Dalton’s law

4. 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),

None of these

29, 700 L

3.6 L

2.97 L

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

Standard temperature

Critical temperature

Absolute temperature

Normal temperature

6. 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

20°C

300 K

30°C

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

Increase

None of these

Increase a little, then decrease.

Decrease

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

116 torr

116 mm of Hg

1 atm

0.1526 atm

9. 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

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

CO₂ and N₂

CHl and NH₃

CH₄ and C₂H₆

CO and CO₂

11. 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

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

Boyl’s law

Charle’s law

Dalton’s law

Avogadro’s law

13. 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

Same as before

Doubled

Halved

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

Curve

Hyperbola

Straight line

Parabola

15. Which state of matter has the lowest density?

Plasma

Gas

Liquid

Solid

16. 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

1.97 L

2.06 L

186,000 L

17. 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

18. CuSO₄ is dissolved in water

Chemical Change

Physical Property

Physical Change

Chemical Property

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

0.082 liter-atm K

0.082 liter-atm K¯¹ mol¯¹

0.082 liter-atm¯¹ K mol

0.082 liter-atm¯¹ K mol¯¹

20. 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

With an accelerated velocity

In a wavy path

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

Directly proportional

None of these

Unrelated

Inversely proportional

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

Ice Cubes

Motion of a Car

Copper (II) nitrate

Carbon Dioxide

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

Added to the total pressure

Divided by the total pressure

Multiplied to the total pressure

Subtracted from the total pressure

24. 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

25. Average kinetic energy of molecules is

Independent of absolute temperature

Directly proportional to square root of temperature

Inversely proportional to absolute temperature

Directly proportional to absolute temperature

Page 2 of 3

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

H₂S

Cl₂

N₂O

27. Which state of matter has lowest density?

Liquid

Gas

Plasma

Solid

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

Effusion

Diffusion

Low density

Attraction with air

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

At high temperature and high pressure

At low temperature and high pressure

At low temperature and low pressure

At high temperature and low pressure

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

RT/P

PRT

P/RT

PT/R

31. At constant volume temperature is increased then

Collision frequency will be increases

Collision will be in straight line

Collision will not change

Collision on walls will be less

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

Normal volume

Molar volume

Total volume

Atomic volume

33. Volume of gas become four times if

Temperature becomes half at constant pressure

Temperature become one fourth at constant pressure

Temperature becomes two times at constant pressure

Temperature become four times at constant pressure

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

Curie point

Critical temperature

Neutral temperature

Inversion temperature

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

Its temperature is more than critical temperature

It cannot be liquefied at any value of P and T

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

Its pressure is more than critical pressure

36. 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

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

None of these

Different

No comparison

Multiples equal

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

Chales

Vander Waal

Boltzman

Clausius

39. 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).

1.65 L

1.25 L

1.49 L

None of these

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

Daltons law

Charles law

Avogadro’s law

Grahams law

41. The specific heat of a gas

Has only one value

Is proportional to the square root of its absolute temperature

Can have any value between 0 and infinity

Has two values Cp and Cv

42. A gas has non-ideal behavior at

High temperature and high pressure

Low temperature and high pressure

High temperature and low pressure

Low temperature and low pressure

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

Vapor pressure

Hydraulic pressure

Aqueous tension

Surface tension

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

1.5 L

1.6 L

None of these

1.94 L

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

98.5 atm

95.8 atm

97.1 atm

96.7 atm

46. The specific heat of an ideal gas is

Proportional to T

Proportional to T³

Proportional to T²

Independent of T

47. An ideal gas cannot be liquefied because

It solidifies before becoming a liquid

Its molecules are relatively small in size

Its critical temperature is always above 0°C

Forces operative between its molecules are negligible

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

Avogadro’s law

Dalton’s law

Charles’s law

Graham’s law

49. 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

Perfect gas law

Ideal gas equation

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

B and C

Low temperature

High pressure

High temperature

Page 3 of 3

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

Physical property, Chemical Change

Physical Change, Chemical Change

Chemical property, Physical Change

Chemical Change, Physical Change

52. Which one is the correct value of R

0.082/Cm³ torr K¯¹ mol¯¹

0.082/dtm Cm³ K¯¹ mol¯¹

0.082/dm³ torr K¯¹ mol¯¹

0.082/dm³ atom K¯¹ mol¯¹

53. 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

None of these

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

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

273 c and 760 mm Hg

273 c and 76 mm Hg

273 k and 76 mm Hg

273 k and 760 mm Hg

55. The gases become non-ideal at

High temperature and high pressure

Low temperature and high pressure

Low temperature and Low pressure

High temperature and Low pressure

56. Which is incorrect in case of ideal gases

PV/RT = n

Behave independently

Can be liquefied

All molecules move with same speed

57. Milk turns sour. This is a

Chemical Change

Chemical Property

Physical Property

Physical Change

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

Pressure, temperature, and volume of the gas

Pressure of the gas

Volume of the gas

Temperature of the gas

59. 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)

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

Beat up

React

Cool down

Move randomly

61. Lind’s method is employed to

Expansion of gas

Compression of gases

Liquefaction of gases

Separation of gases

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

All gases cannot be liquefied through Lind’s Method

All molecules move with same speed

PV/RT = n

All molecules behave independently

63. The non-ideal behavior results chiefly from

Intermolecular attraction only

Elastic collisions and finite volume

Intermolecular attractions and finite volume

Intermolecular attraction and infinite volume

64. The diffusion of gases at absolute zero will be

Unchanged

Slightly decreased

Zero

Slightly increased

65. According to kinetic theory of gases there are

The velocity of molecules decreases for each collision.

Intermolecular attractions

No intermolecular forces of attraction

Molecules which have considerable volume

66. 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

386 K (which equals 113.25 C)

61.8 K (Which equals -211.2 C)

247.2 K (Which equals -25.8C)

67. 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 and pressure both are increased

Temperature is lowered and pressure is increased

Temperature and pressure are both lowered

68. 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

Charles’ law

Graham’s law

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

CH₄ and C₂H₆

CO and CO₂

CO₂ and N₂

HCl and NH₃

70. 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).

None of these

4.125 atm

.66 kPa

.66 atm

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

6.17 x 10¯²⁰ J

6.17 x 10¯²¹ kJ

7.16 x 10¯²⁰ J

6.17 x 10¯²¹ J

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

Hydrophobic bonds

Vander Waal’s forces

Hydrogen bonds

Covalent bonds

73. A pressure of 1Nm¯² is equal to

Stalagmometer

One atmosphere

One bar

One Pascal

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Mustansar KhanLast Updated: October 14, 2025

Important Chemistry Forms of Matter Question and Answer

Chemistry Forms of Matter Practice Test Online With Explanation

Chemistry

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