MCQ on Is Matter Around Us Pure? Class 9 Science: Chapter 2

MCQ on Is Matter Around Us Pure? Class 9 Science: Chapter 2

Important MCQs from 2.1 – What is a Mixture?

1. Which of the following statements is NOT true about mixtures?

(A) Their components retain their individual properties
(B) They can be separated by physical methods
(C) They are always homogeneous
(D) They are formed by mixing two or more substances

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2. What is a mixture?

(A) A substance with only one type of particle
(B) A combination of two or more pure substances mixed in any proportion
(C) A substance that cannot be separated by physical methods
(D) A single form of matter with fixed composition

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3. Which of the following is an example of a mixture?

(A) Sodium chloride
(B) Sugar
(C) Sea water
(D) Copper

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4. Which method is generally used to separate the components of a mixture?

(A) Chemical reaction
(B) Physical method
(C) Nuclear reaction
(D) Electrolysis

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5. What type of mixture is salt dissolved in water?

(A) Heterogeneous
(B) Suspension
(C) Colloid
(D) Homogeneous

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6. Which of the following is not a pure substance?

(A) Sugar
(B) Distilled water
(C) Milk
(D) Oxygen

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7. Which of the following mixtures can be separated by filtration?

(A) Salt solution
(B) Air
(C) Soil in water
(D) Sugar solution

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8. A homogeneous mixture is also called_______

(A) Suspension
(B) Solution
(C) Compound
(D) Element

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9. Which of the following mixture has a uniform composition throughout?

(A) Oil and water
(B) Salt and sulphur
(C) Sugar dissolved in water
(D) Sodium chloride and iron filings

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10. What type of mixture is formed by mixing sodium chloride and iron filings?

(A) Homogeneous mixture
(B) Solution
(C) Heterogeneous mixture
(D) Pure substance

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11. Which of the following is a characteristic of a mixture?

(A) It has a fixed chemical composition
(B) It cannot be separated by physical methods
(C) It contains more than one pure substance
(D) It consists of a single type of particle

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Important MCQs from 2.1.1 – Types of Mixtures

12. What is a homogeneous mixture?

(A) A mixture with non-uniform composition
(B) A mixture with uniform composition throughout
(C) A mixture with visible particles that settle
(D) A mixture that cannot be separated physically

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13. Which of the following is a characteristic of a heterogeneous mixture?

(A) Uniform composition throughout
(B) Particles are evenly distributed
(C) Contains physically distinct parts
(D) Cannot be separated by physical methods

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14. Which of the following is a homogeneous mixture?

(A) Sand and salt
(B) Oil and water
(C) Air
(D) Soil

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15. Which of the following is a heterogeneous mixture?

(A) Salt in water
(B) Sugar in water
(C) Copper sulphate solution
(D) Oil in water

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16. In a heterogeneous mixture:

(A) The composition is uniform throughout
(B) Particles are not visible
(C) Components are visible and not evenly distributed
(D) A solute is completely dissolved in a solvent

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17. Which mixture looks uniform even though it contains more than one substance?

(A) Homogeneous mixture
(B) Heterogeneous mixture
(C) Suspension
(D) Colloid

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18. Which of the following mixtures is heterogeneous?

(A) Lemonade
(B) Soft drink
(C) Air
(D) Mixture of salt and iron filings

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19. A mixture of copper sulphate and water is:

(A) Heterogeneous
(B) Homogeneous
(C) Compound
(D) Element

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20. Which of the following is not a homogeneous mixture?

(A) Milk
(B) Salt solution
(C) Soft drink
(D) Steel

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21. Which of the following is NOT an example of a heterogeneous mixture?

(A) Sodium chloride and iron filings
(B) Oil and water
(C) Sugar dissolved in water
(D) Salt and sulphur

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22. Which of the following is an example of a homogeneous mixture?

(A) Oil and water
(B) Salt dissolved in water
(C) Sodium chloride and iron filings
(D) Salt and sulphur

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Important MCQs from 2.2 – What is a Solution?

23. Which of the following is NOT a characteristic of a true solution?

(A) It is a homogeneous mixture
(B) Its solute particles settle down over time
(C) The particles of a solution cannot be seen with the naked eye.
(D) Its solute cannot be separated by filtration

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24. What is a solution?

(A) A heterogeneous mixture with visible particles
(B) A homogeneous mixture of two or more substances
(C) A mixture where particles settle when undisturbed
(D) A substance that cannot be separated physically

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25. What is the size of particles in a solution?

(A) Larger than 1 nm
(B) Smaller than 1 nm
(C) Visible to the naked eye
(D) Large enough to scatter light

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26. What is an alloy?

(A) A homogeneous mixture of gases
(B) A mixture of two or more metals or a metal and a non-metal
(C) A liquid solution with a gas solute
(D) A heterogeneous mixture with visible particles

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27. Which of the following statements is true for a solution?

(A) Solute particles settle down
(B) Solute particles are visible
(C) It scatters a beam of light
(D) It is stable and clear

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28. Which of the following is a property of a solution?

(A) Particles settle when left undisturbed
(B) It is a heterogeneous mixture
(C) It is stable and particles do not settle
(D) Particles can be separated by filtration

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29. The two main constituents of air are____

(A) Oxygen (78%) and nitrogen (21%)
(B) Nitrogen (78%) and oxygen (21%)
(C) Carbon dioxide (78%) and nitrogen (21%)
(D) Oxygen (50%) and nitrogen (50%)

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30. The path of light is not visible in a solution because:

(A) The solution absorbs light
(B) The particles are large
(C) The particles scatter light
(D) The particles are too small to scatter light

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31. What is the size of particles in a true solution?

(A) More than 1 nm
(B) Less than 1 nm
(C) 1 – 1000 nm
(D) More than 1000 nm

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32. In a solution, the component present in the larger amount is called:

(A) Solute
(B) Suspension
(C) Solvent
(D) Residue

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33. In a sugar solution, sugar acts as:

(A) Solvent
(B) Solute
(C) Residue
(D) Filtrate

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34. Which of the following is a correct example of a solution?

(A) Oil in water
(B) Milk
(C) Salt dissolved in water
(D) Sand in water

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Important MCQs from 2.2.1 – Concentration of a Solution

35. Which of the following statements is true about a saturated solution?

(A) It can dissolve more solute at the given temperature
(B) It contains the maximum amount of solute dissolved at a given temperature
(C) It contains no solute
(D) It is unstable and separates layers

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36. If a saturated solution at high temperature is cooled slowly, what is likely to happen?

(A) Solution becomes more dilute
(B) Solute evaporates
(C) Excess solute settles down
(D) Solution turns into gas

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37. The amount of solute present in a given amount of solution is called its_____

(A) Solubility
(B) Saturation point
(C) Concentration
(D) Solvent

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38. The amount of the solute present in the saturated solution is called its solubility____

(A) Solubility
(B) Saturation point
(C) Concentration
(D) Solvent

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39. Which factor can increase the solubility of a solid in a liquid?

(A) Decreasing temperature
(B) Increasing temperature
(C) Stirring less
(D) Keeping it undisturbed

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40. The amount of solute present in 100 g of solution is 11.1 g. What is the concentration (by mass)?

(A) 10%
(B) 11.1%
(C) 36%
(D) 50%

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41. Which of the following is NOT a way to express the concentration of a solution?

(A) Mass by mass percentage
(B) Mass by volume percentage
(C) Volume by volume percentage
(D) Solute by solvent weight

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42. How is the mass by mass percentage of a solution calculated?

(A) (Volume of solute / Volume of solution) × 100
(B) (Mass of solute / Mass of solution) × 100
(C) (Mass of solvent / Mass of solution) × 100
(D) (Mass of solute / Volume of solution) × 100

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43. What term describes a solution with less solute than a saturated solution at a given temperature?

(A) Concentrated
(B) Saturated
(C) Unsaturated
(D) Supersaturated

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Important MCQs from 2.2.2 – What is a Suspension?

44. A suspension is a:

(A) Homogeneous mixture
(B) Heterogeneous mixture
(C) Compound
(D) Pure substance

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45. What is a suspension?

(A) A homogeneous mixture with uniform composition
(B) A heterogeneous mixture with solute particles that remain suspended
(C) A mixture where particles are smaller than 1 nm
(D) A stable mixture that does not scatter light

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46. What happens when a beam of light is passed through a suspension?

(A) The path of light is not visible
(B) The path of light is visible
(C) The particles do not scatter light
(D) The mixture becomes homogeneous

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47. What happens to the particles in a suspension when left undisturbed?

(A) They remain suspended indefinitely
(B) They settle down, making the suspension unstable
(C) They dissolve completely
(D) They form a homogeneous mixture

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48. How can the solute particles in a suspension be separated from the mixture?

(A) By evaporation
(B) By centrifugation
(C) By filtration
(D) By heating

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49. Which of the following is an example of a suspension?

(A) Tincture of iodine
(B) Milk
(C) Chalk powder in water
(D) Air

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50. Why does a suspension break apart when left undisturbed?

(A) The particles are too small to stay suspended
(B) The particles settle due to their large size
(C) The mixture becomes a solution
(D) The particles dissolve in the medium

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51. Which of the following is true about the Tyndall effect in suspensions?

(A) Suspensions do not scatter light
(B) Suspensions always glow under light
(C) Suspensions scatter light when particles are large enough
(D) Suspensions are transparent and do not show any light path

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52. Which of these properties does a suspension have?

(A) Stable and clear
(B) Cannot be separated by physical methods
(C) Scatters light and is unstable
(D) Homogeneous and uniform

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Important MCQs from 2.2.3 – What is a Colloidal Solution?

53. A colloid is a:

(A) Homogeneous mixture
(B) Heterogeneous mixture that appears homogeneous
(C) Compound
(D) Pure substance

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54. The components of a colloidal solution are:

(A) Solute and solvent
(B) Filtrate and residue
(C) Dispersed phase and dispersion medium
(D) Mixture and compound

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55. A colloid is quite stable because:

(A) Its particles settle quickly
(B) Its particles do not settle when left undisturbed
(C) It is a true solution
(D) It can be filtered easily

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56. Which part of a colloidal solution is like the solute?

(A) Dispersion medium
(B) Dispersed phase
(C) Saturated component
(D) Filtrate

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57. Which of the following is NOT a property of colloids?

(A) They are heterogeneous
(B) They show the Tyndall effect
(C) Their particles settle down on standing
(D) They appear homogeneous to the eye

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58. Which of the following is true about a colloid?

(A) It is a pure substance
(B) Its particles can be seen with the naked eye
(C) It scatters a beam of light
(D) Its solute settles down over time

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59. The path of light becomes visible in a colloidal solution due to:

(A) Transparency of liquid
(B) Movement of solute particles
(C) Tyndall effect caused by colloidal particles
(D) Light absorption

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60. Which of the following mixtures shows the Tyndall effect?

(A) True solution
(B) Colloid
(C) Suspension
(D) Both (B) and (C)

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61. The particles in a colloid:

(A) Settle down on standing
(B) Are visible to the naked eye
(C) Are too small to scatter light
(D) Do not settle and are not visible to the naked eye

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62. Which of the following is an example of a colloidal solution?

(A) Copper sulphate solution
(B) Sugar in water
(C) Milk
(D) Chalk powder in water

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63. How can the particles in a colloidal solution be separated?

(A) By filtration
(B) By evaporation
(C) By centrifugation
(D) By heating

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Important MCQs from 2.3: Physical and Chemical Changes

64. Which of the following is a physical change?

(A) Rusting of iron
(B) Melting of ice
(C) Burning of wood
(D) Cooking of food

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65. A change in which a new substance is formed is called a:

(A) Physical change
(B) Irreversible change
(C) Temporary change
(D) Chemical change

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66. Which of the following is an example of a chemical change?

(A) Boiling of water
(B) Tearing of paper
(C) Cooking of food
(D) Melting of butter

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67. Which of the following is a physical change with no new substance formed?

(A) Burning of candle wax
(B) Freezing of water
(C) Rusting of iron
(D) Digestion of food

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68. Which of the following involves both physical and chemical change?

(A) Melting of ice
(B) Cutting of wood
(C) Burning of a candle
(D) Evaporation of water

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69. Which property does NOT change during a physical change?

(A) Shape
(B) State
(C) Appearance
(D) Chemical composition

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70. Rusting of iron is an example of:

(A) Physical change
(B) Reversible change
(C) Chemical change
(D) Mixture formation

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71. Which of the following is NOT a characteristic of a chemical change?

(A) New substance is formed
(B) Change is usually irreversible
(C) No change in energy
(D) Chemical properties change

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Important MCQs from – 2.4.1: Elements

72. What is an element?

(A) A substance composed of two or more elements chemically combined
(B) A basic form of matter that cannot be broken down by chemical reactions
(C) A mixture of substances with variable composition
(D) A substance that can be separated by physical methods

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73. Which of the following elements changes to liquid just above room temperature?

(A) Mercury and bromine
(B) Gallium and cesium
(C) Nitrogen and oxygen
(D) Zinc and aluminium

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74. Which of the following elements is liquid at room temperature?

(A) Mercury
(B) Sulphur
(C) Copper
(D) Iodine

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75. Which of the following sets contains only non-metallic elements?

(A) Sulphur, Bromine, Sodium
(B) Carbon, Chlorine, Iodine
(C) Nitrogen, Iron, Neon
(D) Oxygen, Potassium, Helium

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76. How many elements are naturally occurring?

(A) 100
(B) 92
(C) 11
(D) 2

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77. Which of the following is true for non-metals?

(A) They are lustrous and ductile
(B) They are sonorous and malleable
(C) They are poor conductors of heat and electricity
(D) They are all liquids at room temperature

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78. Which of the following is a property of metals?

(A) They conduct heat and electricity.
(B) They are malleable
(C) They are sonorous and lustrous
(D) All the above

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79. Which of the following is a metalloid?

(A) Silicon
(B) Iron
(C) Carbon
(D) Neon

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80. Who was the first scientist to use the term “element” in 1661?

(A) Antoine Laurent Lavoisier
(B) Robert Boyle
(C) John Dalton
(D) Dmitri Mendeleev

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81. Elements are classified into:

(A) Solids and gases
(B) Metals, non-metals, and metalloids
(C) Organic and inorganic
(D) Simple and complex

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Important MCQs from – 2.4.2: Compounds

82. A compound is formed when:

(A) Two or more elements mix physically
(B) Two or more substances dissolve in water
(C) Two or more elements combine chemically in a fixed ratio
(D) A single element changes its state

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83. Which of the following properties is true for a compound?

(A) Its components retain their original properties
(B) It has a variable composition
(C) It can be separated by physical methods
(D) It has different properties from its constituent elements

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84. Which of the following statements about compounds is incorrect?

(A) A compound is a pure substance
(B) Compounds can be broken down into simpler substances by chemical methods
(C) Compounds are formed by physical mixing of elements
(D) The properties of compounds are different from their constituent elements

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85. In a compound, the ratio of elements is:

(A) Always variable
(B) Sometimes fixed
(C) Fixed and definite
(D) Not measurable

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86. The best method to separate elements from a compound is:

(A) Filtration
(B) Distillation
(C) Chemical or electrochemical reaction
(D) Magnetic separation

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87. How does a compound differ from a mixture?

(A) A compound retains the properties of its constituents
(B) A compound has a variable composition
(C) A compound has properties different from its constituent elements
(D) A compound can be separated by physical methods

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88. Which of the following is a compound?

(A) Air
(B) Soil
(C) Water
(D) Brass

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