We have compiled a set of Class 9 Chemistry MCQs with answers for Chapter 2: “Is Matter Around Us Pure?”. These MCQ Science Class 9 are designed according to the CBSE board curriculum, aligning with the latest syllabus. By practicing these MCQs, students can review the chapter’s concepts and prepare for their Class 9 exams and other entrance exams like CTET and KVS. These questions cover topics such as mixtures, solutions, suspensions, colloids, physical and chemical changes, and separation techniques. Regular practice with these MCQs will strengthen students’ understanding and problem-solving skills in Chemistry.
MCQ Questions for Class 9 Science Chapter-2 Is Matter Around us Pure With Answers
Q1. a pure substance consists of a ………… type of particle/particles
(a) Single
(b) Double
(c) Triple
(d) half
Ans. Single
Q2. Pure substances are ………… by physical methods:
(a) separable
(b) non-separable
Ans. non-separable
Q3. Based upon the nature of constituent particle/particles a pure substance is of:
(a) One type
(b) Two types
Ans. Two types
Q4. The term element was first used by :
(a) Antoine Laurent Lavoisier
(b) Dalton
(c) Newton
(d) Robert Boyle
Ans. Robert Boyle
Q5. An element is a ………. substance.
(a) Good
(b) Pure
(c) Impure
(d) Hard
Ans. Pure
Q6. ……….. is the only metal that is liquid at room temperature.
(a) Bromine
(b) Chlorine
(c) Mercury
(d) Iron
Ans. Mercury
Q7. ‘Boron’ is an example of:
(a) Metal
(b) Non-Metal
(c) Metalloid
(d) Mixture
Ans. Metalloid
Q8. A mixture in which the constituents are uniformly distributed throughout without any clear boundary of separation is called?
(a) Homogeneous mixture
(b) Non-Homogeneous mixture
(c) Heterogeneous mixture
Ans. Homogeneous mixture
Q9. in sugar solution sugar is the ………. and water is the ……….
(a) solute, solvent
(b) solvent, solute
(c) solvent, solvent
(d) solute, solute
Ans. solute, solvent
Q10. A solution of iodine in alcohol is known as ……..
(a) tincture of iodine
(b) tincture of sugar
(c) tincture of oxygen
(d) tincture of hydrogen
Ans. tincture of iodine
Q11. A solution is a ……. mixture?
(a) homogeneous
(b) heterogeneous
(c) both
(d) Saturated
Ans. Homogeneous
Q12. The particles of a solution are smaller than:
(a) 1nm
(b) 2nm
(c) 5nm
(d) 0.5nm
Ans. 1 nm
Q13. The amount of solute dissolved in a given volume of the solvent is called :
(a) the concentration of a solution
(b) the concentration of a solvent
(c) the concentration of a solute
(d) none of the above
Ans. the concentration of a solution
Q14. if the amount of solute contained in a solution is less than the saturation level, it is called:
(a) solution
(b) saturated solution
(c) unsaturated solution
(d) suspension
Ans. unsaturated solution
Q15. The particles of suspension can be seen with the naked eye:
(a) true
(b) false
Ans. true
Q16. Physical changes are generally reversible:
(a) true
(b) false
Ans. true
Q17. ‘burning of coal’ is an example of:
(a) physical change
(b) chemical change
(c) permanent change
(d) temporary change
Ans. chemical change
Q18. Which of the following is not a characteristic of a pure substance?
a) It cannot be separated into other substances by physical means.
b) It consists of only one type of particle.
c) It has a fixed melting point.
d) It can be a solid, liquid, or gas.
Answer: a) It cannot be separated into other substances by physical means.
Q19. Which of the following is a homogeneous mixture?
a) Saltwater
b) Sand and water
c) Oil and water
d) Granite
Answer: a) Saltwater
Q20. The process of converting a solid directly into a gas is called:
a) Condensation
b) Sublimation
c) Evaporation
d) Melting
Answer: b) Sublimation
Q21. Which of the following is an example of a compound?
a) Oxygen gas (O2)
b) Carbon dioxide (CO2)
c) Gold (Au)
d) Hydrogen gas (H2)
Answer: b) Carbon dioxide (CO2)
Q22. Which method can be used to separate a mixture of salt and water?
a) Filtration
b) Distillation
c) Evaporation
d) Sublimation
Answer: c) Evaporation
Q23. Which of the following is a physical change?
a) Burning of wood
b) Rusting of iron
c) Dissolving sugar in water
d) Cooking an egg
Answer: c) Dissolving sugar in water
Q24. Which of the following is a chemical change?
a) Cutting a paper into pieces
b) Boiling water
c) Burning of candle
d) Melting ice
Answer: c) Burning of candle
Q25. Which of the following is not a method to separate components of a mixture?
a) Filtration
b) Decantation
c) Fractional distillation
d) Sublimation
Answer: d) Sublimation
Q26. The process of separating a liquid from a mixture by heating and condensing the vapor is called:
a) Filtration
b) Distillation
c) Sublimation
d) Evaporation
Answer: b) Distillation
Q27. Which of the following is a colloid?
a) Saltwater
b) Milk
c) Lemon juice
d) Vinegar
Answer: b) Milk
Q28. Which of the following is a physical property of a substance?
a) Reactivity with acid
b) Color
c) Burning in air
d) Formation of rust
Answer: b) Color
Q29. Which of the following is an example of a heterogeneous mixture?
a) Air
b) Sugar dissolved in water
c) Brass
d) Soil
Answer: d) Soil
Q30. Which of the following is not a type of pure substance?
a) Element
b) Compound
c) Mixture
d) All of the above are types of pure substances.
Answer: c) Mixture
Q31. Which statement correctly describes compounds?
a) Compounds consist of two or more elements mixed physically.
b) Compounds have a variable composition of elements.
c) Compounds are substances formed by chemically combining elements.
d) Compounds can be either homogeneous or heterogeneous.
Answer: c) Compounds are substances formed by chemically combining elements.
Q32. What is the main difference between compounds and mixtures?
a) Compounds have a fixed chemical composition, while mixtures have a variable composition.
b) Compounds are always heterogeneous, while mixtures can be homogeneous.
c) Compounds do not have any chemical properties, while mixtures do.
d) Compounds are formed by physically mixing substances, while mixtures are formed by chemical reactions.
Answer: a) Compounds have a fixed chemical composition, while mixtures have a variable composition.
Q33. Which of the following is an example of a compound?
a) Crude oil
b) Seawater
c) Aluminium
d) Hydrogen peroxide
Answer: d) Hydrogen peroxide
Q34. What defines an element?
a) Elements are substances formed by chemically combining elements.
b) Elements are mixtures with a fixed chemical composition.
c) Elements have the same number of protons in their atomic nuclei.
d) Elements are compounds with a variable composition.
Answer: c) Elements have the same number of protons in their atomic nuclei.
Q35. Which category includes species that exhibit properties of both metals and non-metals?
a) Metals
b) Nonmetals
c) Mixtures
d) Metalloids
Answer: d) Metalloids
Q36. Which type of mixture has a uniform composition throughout?
a) Homogeneous mixture
b) Heterogeneous mixture
c) Solution
d) Solid mixture
Answer: a) Homogeneous mixture
Q37. Which of the following is an example of a heterogeneous mixture?
a) Sugar in water
b) Salt in water
c) Mixture of salt and iron filings
d) Solution of gas in liquid
Answer: c) Mixture of salt and iron filings
Q38. What is the most common type of homogeneous mixture?
a) Solid mixture
b) Heterogeneous mixture
c) Solution
d) Gas mixture
Answer: c) Solution
Q39. A physical change results in:
a) New compounds with different properties.
b) Formation of a new substance.
c) Changes in the nature of particles.
d) No alteration in the nature, particles, or quantity of the substance.
Answer: d) No alteration in the nature, particles, or quantity of the substance.
Q40. Which of the following is an example of a physical change?
a) Burning of wood
b) Melting of ice
c) Souring of milk
d) Formation of a new compound
Answer: b) Melting of ice
Q41. In a chemical change, a new substance is formed with:
a) Only new physical properties.
b) Only new chemical properties.
c) New physical and chemical properties.
d) No change in properties.
Answer: c) New physical and chemical properties.
Q42. What is a solution?
a) A mixture with physically distinct parts.
b) A homogeneous mixture of two or more substances.
c) A mixture that can be separated by filtration.
d) A combination of metals and non-metals.
Answer: b) A homogeneous mixture of two or more substances.
Q43. Which component of a solution is present in the largest amount?
a) Solute
b) Solvent
c) Suspension
d) Colloid
Answer: b) Solvent
Q44. What is the property of a solution that does not show the Tyndall effect?
a) Homogeneous composition
b) Scattering of light by particles
c) Heterogeneous composition
d) Settling down of particles
Answer: a) Homogeneous composition
Q45. What are alloys?
a) Homogeneous mixtures of metals or a metal with another element.
b) Solutions with a small amount of solute.
c) Heterogeneous mixtures that can be separated by filtration.
d) Suspensions with large solute particles.
Answer: a) Homogeneous mixtures of metals or a metal with another element.
Q46. What is solubility?
a) The ability of a substance to dissolve in a solvent.
b) The property of a solution to scatter light.
c) The maximum amount of solute that can dissolve in a solvent.
d) The separation of particles in a colloid.
Answer: a) The ability of a substance to dissolve in a solvent.
Q47. How does solubility change with temperature?
a) Solubility decreases with increasing temperature.
b) Solubility increases with increasing temperature.
c) Solubility remains constant with temperature.
d) Solubility depends on the nature of the solute.
Answer: b) Solubility increases with increasing temperature.
Q48. What is a suspension?
a) A homogeneous mixture of two or more substances.
b) A mixture in which solute particles dissolve completely.
c) A heterogeneous mixture with solute particles suspended in the medium.
d) A mixture that exhibits the Tyndall effect.
Answer: c) A heterogeneous mixture with solute particles suspended in the medium.
Q49. What is the Tyndall effect?
a) The scattering of light by particles in a colloid or fine suspension.
b) The separation of components in a solution by filtration.
c) The formation of a new substance in a chemical change.
d) The property of a solution to have a uniform composition.
Answer: a) The scattering of light by particles in a colloid or fine suspension.
Q50. In which type of colloidal solution is the dispersed phase solid/liquid and the dispersing medium gas?
a) Aerosol
b) Foam
c) Sol
d) Emulsion
Answer: a) Aerosol
Q51. What is the process called when water is converted into water vapor?
a) Condensation
b) Sublimation
c) Evaporation
d) Melting
Answer: c) Evaporation
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