Class 9 Science MCQ Is Matter Around Us Pure

Question : Which of the following are chemical changes?
(a) Decaying of wood
(b) Burning of wood
(c) Sawing of wood
(d) Hammering of a nail into a piece of wood
(a) (i) and (b)
(b) (b) and (c)
(c) (c) and (d)
(d) (i) and (d)

Question : 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

Question : 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

Question : 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?
(a) P is a compound
(b) X and Y are compounds
(c) X and Y are elements
(d) P has a fixed composition
(i) (a), (b) and (c)
(b) (a), (b) and (d)
(c) (b), (c) and (d)
(d) (a), (c) and (d)

Question : Which of the following methods would you use to separate cream from milk?
(a) Fractional distillation
(b) Distillation
(c) Centrifugation
(d) Filtration

Question : Which of the following are homogeneous in nature?
(a) ice
(b) wood
(c) soil
(d) air
(i) (a) and (c)
(b) (b) and (d)
(c) (a) and (d)
(d) (c) and (d)

Question : Blood and sea water are
(a) both mixtures
(b) both are compounds
(c) blood is a mixture whereas sea water is a compound
(d) blood is a compound and sea water is a mixture

Question : Boron and carbon are
(a) metalloids
(b) metalloid and non-metal respectively
(c) metal
(d) non-metal and metalloid respectively

Question : Which of the following statements are true for pure substances?
(a) Pure substances contain only one kind of particles
(b) Pure substances may be compound or mixtures
(c) Pure substances have the same composition throughout
(d) Pure substances can be exemplified by all elements other than nickel
(a) (i) and (b)
(b) (i) and (c)
(c) (c) and (d)
(d) (b) and (c)

Question : 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

Question : Which of the following are physical changes?
(a) Melting of iron metal
(b) Rusting of iron
(c) Bending of an iron rod
(d) Drawing a wire of iron metal
(a) (i), (b) and (c)
(b) (i), (b) and (d)
(c) (i), (c) and (d)
(d) (b), (c) and (iv

Question : Two substances, A and B were made to react to reaction a third substance, A2B
according to the following
2 A + B → A2B
Which of the following statements concerning this reaction are incorrect?
(a) The product A2B shows the properties of substances A and B
(b) The product will always have a fixed composition
(c) The product so formed cannot be classified as a compound
(d) The product so formed is an element
(i) (a), (b) and (c)
(b) (b), (c) and (d)
(c) (a), (c) and (d)
(d) (b), (c) and (d)

Question : 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

Question : Mercury and bromine are both
(a) liquid at room temperature
(b) solid at room temperature
(c) gases at room temperature
(d) both (a) and (b)

Question : Sol and gel are examples of
(a) Solid-solid colloids
(b) Sol is a solid-liquid colloid and gel is liquid solid colloid
(c) Sol is solid-solid colloid and gel is solid-liquid colloid
(d) Sol is a liquid-solid colloid and gel is a solid-liquid colloid

Question : In a water-sugar solution
(a) water is solute and sugar is solvent
(b) water is solvent and sugar is solute
(c) water is solute and water is also solvent
(d) none of these

Question : Who was the first scientist to use the term ‘element’ in 1661?
(a) Robert Boyle
(b) Charles
(c) Antonnie Lorent
(d) None of them

Question : The components of a solution are:
(a) Dispersed particles and solvent
(b) Solute and solvent
(c) Dispersed phase and dispersion medium
(d) Solute and dispersed medium

Question : Air is regarded as a mixture because
(a) it pressure may vary
(b) its temperature may change
(c) its volume changes under different conditions
(d) its composition may vary

Question : 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

Question : What is the name of the metal which exists in liquid state at room temperature?
(a) Mercury
(b) Bromine
(c) Sodium
(d) Potassium

Question : Which of the following is not a mixture ?
(a) kerosene
(b) air
(c) alcohol
(d) petrol