Question

Class 9 Science MCQ Questions of Is Matter Around Us Pure with Answers?

Answer 1

Class 9 Science MCQ Questions of Is Matter Around Us Pure are very valuable for the forthcoming yearly Exams.  These questions will assist students with acclimating themselves with familiarising significant ideas and concepts.

Class 9 Science Is Matter around Us Pure will help you in deciding the types of questions that can be asked in  Class 9 exams and competitive exams. That will assist you with acquiring additional information from the examination point of view.

Practice MCQ Questions for class 9 Chapter-Wise

1. What is the name of the metal which exists in a liquid state at room temperature?

(a) Sodium
(b) Potassium
(c) Mercury
(d) Bromine

2. What is the name of the metal which exists in liquid state at room temperature?

(a) Mercury
(b) Bromine
(c) Sodium
(d) Potassium

3. Two chemical species X and Y combine together to form a product P which contains both X and Y X + Y → P. X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and P are correct?

(i) P is a compound

(ii) X and Y are compounds

(iii) X and Y are elements

(iv) P has a fixed composition

(a) (i), (ii) and (iii),
(b) (i), (ii) and (iv)
(c) (ii), (iii) and (iv)
(d) (i), (iii) and (iv)

4. What is the name of the non metal which exists in liquid state at room temperature?

(a) Mercury
(b) Bromine
(c) Sodium
(d) Potassium

5. Two substances, A and B were made to react to form a third substance, A₂B according to the following reaction 2A + B → A₂B which of the following statements concerning this reaction are incorrect?

(i) The product A2B shows the properties of substances A and B

(ii) The product will always have a fixed composition

(iii) The product so formed cannot be classified as a compound

(iv) The product so formed is an element

(a) (i), (ii) and (iii),
(b) (ii), (iii) and (iv)
(c) (i), (iii) and (iv)
(d) (ii), (iii) and (iv)

6. When the liquid is spun rapidly, the denser particles are forced to the bottom and the lighter particles stay at the top. This principle is used in:

(a) Centrifugation
(b) Fractional distillation
(c) Evaporation
(d) Tunneling

7. Which of the following elements is not a metalloid?

(a)  Boron
(b) Silicon
(c) Germanium
(d) Tungsten

8. Which of the following are chemical changes?

(i) Decaying of wood

(ii) Burning of wood

(iii) Sawing of wood

(iv) Hammering of a nail into a piece of wood

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)

9. If we put camphor in an open container, its amount keeps on decreasing due to the phenomenon of

(a) Evaporation
(b) Precipitation
(c) Condensation
(d) Sublimation

10. Which of the following are physical changes?

(i) Melting of iron metal

(ii) Rusting of iron

(iii) Bending of an iron rod

(iv) Drawing a wire of iron metal

(a) (i), (ii) and (iii)
(b) (i), (ii) and (iv)
(c) (i), (iii) and (iv)
(d) (ii), (iii) and (iv)

11. Which of the following are homogeneous in nature?

(i) ice

(ii) wood

(iii) soil

(iv) air

(a) (i) and (iii)
(b) (ii) and (iv)
(c) (i) and (iv)
(d) (iii) and (iv)

12. Which of the following non-metal is a good conductor of electricity?

(a) Aluminium
(b) Silicon
(c) Graphite
(d) Gold

13. Which of the following property does not describe a compound?

(a) It is composed of two or more elements
(b) It is a pure substance.
(c) It cannot be separated into constituents by physical means
(d) It is mixed in any proportion by mass

14. Tincture of iodine has antiseptic properties. This solution is made by dissolving

(a) iodine in potassium iodide
(b) iodine in vaseline
(c) iodine in water
(d) iodine in alcohol

15. A mixture of sulphur and carbon disulphide is

(a) heterogeneous and shows Tyndall effect
(b) homogeneous and shows Tyndall effect
(c) heterogeneous and does not show Tyndall effect
(d) homogeneous and does not show Tyndall effect

16. When two liquids do not mix, they form two separate layers and are known as

(a) Miscible liquids
(b) Immiscible liquids
(c) Saturated liquids
(d) Super saturated liquids

17. Cooking of food and digestion of food:

(a) are both physical processes
(b) are both chemical processes
(c) cooking is physical whereas digestion is chemical
(d) cooking is chemical whereas digestion is physical

18. More than one kind of pure form of matter combines forming………..

(a) Texture
(b) Solution
(c) Mixture
(d) Component

19. Rusting of an article made up of iron is called

(a) corrosion and it is a physical as well as chemical change
(b) dissolution and it is a physical change
(c) corrosion and it is a chemical change
(d) dissolution and it is a chemical change

20. According to the definition of pure substance, which of the following is a pure substance?

(a) Ice
(b) Mercury
(c) Iron
(d) All of these

Answer 2

1. Answer: (c) Mercury

2. Answer: (a) Mercury

Explanation: The metal which exist as a liquid at room temperature is mercury. 

3. Answer : (d) (i), (iii) and (iv)

Explanation: Here X and Y cannot be further broken down into simpler substances. Hence X and Y are elements and P can be broken down to its elements hence P is a compound with a fixed composition.

4. Answer: (b) Bromine

Explanation: Non-metal which exist as a liquid at room temperature is bromine.

5. Answer : (c) (i), (iii) and (iv)

Explanation: A₂B is a compound made up of two elements A and B in a fixed ratio. The properties of a compound (e.g., A₂B) are entirely different from those of its constituent elements (i,e.g A and B). The composition of a compound is fixed.

6. Answer: (a) Centrifugation

7. Answer: (d) Tungsten

8. Answer: (a) (i) and (ii)

Explanation: Decaying of wood and burning of wood, because there will be a change of chemical composition and wood cannot be restored to its original form.

Sawing of wood and hammering of nail into a piece of wood are physical process where the chemical composition of compounds is not changed.

9. Answer: (d) Sublimation

10. Answer: (c) (i), (iii) and (iv)

Explanation: Rusting of iron is a chemical process where iron reacts with water and oxygen to produce iron oxide whereas other processes are physical changes.

11. Answer: (c) (i) and (iv)

Explanation: Air and ice are homogeneous mixture because its elements are not visible and cannot be distinguished from one another.

12. Answer: (c) Graphite

13. Answer: (d) It is mixed in any proportion by mass

14. Answer: (d) iodine in alcohol

Explanation: Tincture is prepared by using 2-7% elemental iodine and either of potassium iodide or sodium dissolved in alcohol. Since alcohol is a good solvent and iodine does not dissolve in water answer should be alcohol.

15. Answer: (a) heterogeneous and shows Tyndall effect.

Explanation: A mixture of sulphur and carbon disulphide is heterogeneous and shows Tyndall effect because in a colloidal solution the particles are big enough to scatter light.

16. Answer: (b) Immiscible liquids

17. Answer: (b) are both chemical processes

18. Answer: (c) Mixture

19. Answer: (c) corrosion and it is a chemical change

Explanation: Rusting of iron is corrosion and it’s a chemical change because rust is a chemical compound called hydrated iron oxide Fe₂O₃. nH₂O, iron(III) which is different from elemental iron.

Physical changes are those changes in which substance identity is not changed and it can get back to its original form ex: water freezing to ice can be melted back to water. Whereas chemical changes are those in which original substance identity is changed and they cannot be restored to their original form.

On adding solid solutes to the solvent, some solute dissolves and its concentration increases in solution. This process is known as dissolution.

Crystallization is a process in which Solute particles in solution collide with the solid solute particles to get separated out of solution.

20. Answer: (d) All of these

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