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

CHl and NH₃

CH₄ and C₂H₆

CO and CO₂

CO₂ and N₂

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

Low density

Diffusion

Attraction with air

Effusion

3. 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¯²¹ kJ

6.17 x 10¯²⁰ J

6.17 x 10¯²¹ J

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

0.082 liter-atm¯¹ K mol¯¹

0.082 liter-atm¯¹ K mol

0.082 liter-atm K¯¹ mol¯¹

0.082 liter-atm K

5. 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

6. At constant volume temperature is increased then

Collision on walls will be less

Collision frequency will be increases

Collision will not change

Collision will be in straight line

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

273 k and 76 mm Hg

273 c and 76 mm Hg

273 k and 760 mm Hg

273 c and 760 mm Hg

8. The diffusion of gases at absolute zero will be

Slightly increased

Zero

Slightly decreased

Unchanged

9. 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

10. One mole of a gas refers to

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

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

11. Which of the following statements is false?

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)

Avogadro number = 6.02 x 10²¹

12. 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 high temperature and low pressure

At low temperature and low pressure

13. Average kinetic energy of molecules is

Inversely proportional to absolute temperature

Independent of absolute temperature

Directly proportional to square root of temperature

Directly proportional to absolute temperature

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

Chemical property

Physical property

Chemical Change

Physical Change

15. 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

29, 700 L

None of these

3.6 L

16. 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

4.125 atm

.66 kPa

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

Partial pressure

Atmospheric pressure

Vapour pressure

Osmotic pressure

18. Volume of gas become four times if

Temperature become four times at constant pressure

Temperature become one fourth at constant pressure

Temperature becomes two times at constant pressure

Temperature becomes half at constant pressure

19. CuSO₄ is dissolved in water

Chemical Property

Chemical Change

Physical Change

Physical Property

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

All molecules behave independently

All gases cannot be liquefied through Lind’s Method

All molecules move with same speed

PV/RT = n

21. According to kinetic theory of gases there are

Intermolecular attractions

Molecules which have considerable volume

The velocity of molecules decreases for each collision.

No intermolecular forces of attraction

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

Carbon Dioxide

Ice Cubes

Motion of a Car

Copper (II) nitrate

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

Charles’s law

Graham’s law

Dalton’s law

Avogadro’s law

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

Physical property, Chemical Change

Chemical Change, Physical Change

Physical Change, Chemical Change

Chemical property, Physical Change

25. The non-ideal behavior results chiefly from

Intermolecular attraction and infinite volume

Intermolecular attractions and finite volume

Intermolecular attraction only

Elastic collisions and finite volume

Page 2 of 3

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

Charle’s law

Boyl’s law

Avogadro’s law

Dalton’s law

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

Avogadro’s law

Grahams law

Charles law

Daltons law

28. 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

29. 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).

None of these

1.65 L

1.25 L

1.49 L

30. Which state of matter has lowest density?

Gas

Liquid

Plasma

Solid

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

P/RT

PRT

PT/R

RT/P

32. 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

Multiplied to the total pressure

Subtracted from the total pressure

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

Parabola

Curve

Hyperbola

Straight line

34. 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)

61.8 K (Which equals -211.2 C)

386 K (which equals 113.25 C)

All of these

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

Different

No comparison

None of these

Multiples equal

36. Milk turns sour. This is a

Chemical Change

Physical Property

Physical Change

Chemical Property

37. Liquefaction of gas can only be carried out if

The temperature is below the critical and pressure is very high

The temperature is more than critical and pressure is 1000 atm

Without caring for the value critical volume at critical stage

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

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

116 mm of Hg

1 atm

0.1526 atm

116 torr

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

Graham’s law

Boyle’s law

Charles’ law

Hook’s law

40. A gas has non-ideal behavior at

Low temperature and high pressure

High temperature and high pressure

High temperature and low pressure

Low temperature and low pressure

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

Cl₂

H₂S

N₂O

42. 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

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

With an accelerated velocity

Ina circular path

In a straight line path

In a wavy path

44. 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

Ideal gas equation

Perfect gas law

Charles’ law

45. 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

46. Lind’s method is employed to

Separation of gases

Liquefaction of gases

Expansion of gas

Compression of gases

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

Aqueous tension

Vapor pressure

Surface tension

Hydraulic pressure

48. Which state of matter has the lowest density?

Plasma

Liquid

Gas

Solid

49. The gases become non-ideal at

High temperature and Low pressure

Low temperature and high pressure

Low temperature and Low pressure

High temperature and high pressure

50. A pressure of 1Nm¯² is equal to

One bar

One Pascal

One atmosphere

Stalagmometer

Page 3 of 3

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

Increase a little, then decrease.

Decrease

None of these

Increase

52. 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

53. Which is incorrect in case of ideal gases

All molecules move with same speed

Can be liquefied

Behave independently

PV/RT = n

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

Low temperature

High pressure

High temperature

B and C

55. The specific heat of a gas

Is proportional to the square root of its absolute temperature

Has only one value

Has two values Cp and Cv

Can have any value between 0 and infinity

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

Neutral temperature

Critical temperature

Inversion temperature

Curie point

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

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

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

None of these

The gases are NOT fluid

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

Standard temperature

Absolute temperature

Normal temperature

Critical temperature

59. 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

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

Volume of the gas

Pressure of the gas

Pressure, temperature, and volume of the gas

Temperature of the gas

61. 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

Halved

Same as before

Doubled

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

Hydrogen bonds

Vander Waal’s forces

Covalent bonds

Hydrophobic bonds

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

64 gmol¯¹

32 gmol¯¹

48 gmol¯¹

16 gmol¯¹

64. 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?

30°C

300 K

400 K

20°C

65. An ideal gas cannot be liquefied because

Forces operative between its molecules are negligible

It solidifies before becoming a liquid

Its critical temperature is always above 0°C

Its molecules are relatively small in size

66. 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/Cm³ torr K¯¹ mol¯¹

0.082/dtm Cm³ K¯¹ mol¯¹

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

None of these

Unrelated

Directly proportional

Inversely proportional

68. Ideal gasses have all the following characteristics except.

All of the above are correct

Absence of intermolecular forces

Collisions among the molecules of an ideal gas are perfectly elastic

The molecules occupy no space

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

Vander Waal

Clausius

Chales

Boltzman

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

Molar volume

Atomic volume

Total volume

Normal volume

71. The specific heat of an ideal gas is

Proportional to T²

Independent of T

Proportional to T

Proportional to T³

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

Beat up

Cool down

React

Move randomly

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

312,480 L

None of these

3.25 L

3.15L

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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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