Q 1 – Which of the following substances will not dissolve in water?
(a) Sugar
(b) Sodium chloride
(c) Copper sulphate
(d) Carbon
Ans – (d) Carbon
Q 2 – 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
Ans –(c) corrosion and it is a chemical change
Q 3 –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
Ans – (d) homogeneous and does not show Tyndall effect
Q 4– The smell of hydrogen sulphide (H2S) gas
(a) pleasant
(b) of rotten egg
(c) of burning sulphur
(d) None of these
Ans – (b) of rotten egg
Q 5 –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
Ans – (d) iodine in alcohol
Q 6– What will you observe when a mixture of iodine and salt is heated in a china dish?
(a) No change in the china dish is observed.
(b) Salt is left behind in the china dish.
(c) Iodine is left behind in the china dish.
(d) The mixture starts melting.
Ans – (b) Salt is left behind in the china dish
Q 7 – An example of liquid metal and a liquid non-metal is
(a) gallium, mercury
(b) mercury, chlorine
(c) mercury, bromine
(d) bromine, sulphur
Ans – (c) mercury, bromine
Q 8 –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)
Ans –(c) (i) and (iv)
Q 9 –Blood and seawater are
(a) both mixtures
(b) both are compounds
(c) blood is a mixture whereas seawater is a compound
(d) blood is a compound and seawater is a mixture
Ans – (a) both mixtures
Q 10 – Which technique is used in diagnostic laboratories for blood and urine test?
(a) Sublimation
(b) Centrifugation
(c) Evaporation
(d) Magnetic separation
Ans – (b) Centrifugation
Q 11 –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 a solid-liquid colloid
(d) Sol is a liquid-solid colloid and gel is a solid-liquid colloid
Ans –(b) Sol is a solid-liquid colloid and gel is liquid-solid colloid
Q 12 –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
Ans – (b) water is solvent and sugar is solute
Q 13– The continuous zig-zag movement of colloidal particles in a dispersion medium is called
(a) Dispersion
(b) Tyndall effect
(c) Brownian movement
(d) Oscillation
Ans – (c) Brownian movement
Q 14 – Boron and carbon are
(a) metalloids
(b) metalloid and non-metal respectively
(c) metal
(d) non-metal and metalloid respectively
Ans – (b) metalloid and non-metal respectively
Q 15 – 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)
Ans – (c) (i), (iii) and (iv)
Q 16 – A change of state from one form to another is a
(a) physical change
(b) chemical change
(c) biological change
(d) state variation
Ans – (a) physical change
Q 17 –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)
Ans – (a) (i) and (ii)
Q 18 – The formation of water from oxygen and hydrogen is a _______ .
(a) Physical change
(b) Chemical change
(c) Reversible change
(d) Both Physical and Reversible change
Ans – (b) Chemical change
Q 19 – What do you understand by the term concentrated solution?
(a) Solution containing no solute
(b) Solution with low solute concentration
(c) Solution in which no more solute can be dissolved
(d) Solution with high solute concentration
Ans – (d) Solution with high solute concentration
Q 20 –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?
(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)
Ans –(c) (i), (iii) and (iv)
Q 21 – The clear liquid which is left behind in the beaker after settling down of the sediments is called:
(a) Solvent
(b) Supernatant liquid
(c) Solution
(d) Sediment
Ans –(b) Supernatant liquid
Q 22 –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)
Ans – (d) (i), (iii) and (iv)
Q 23– Which of the following parameters of a substance does not alter during a physical change?
(a) State
(b) Mass
(c) Volume
(d) Size
Ans – (b) Mass
Q 24 –Which of the following methods would you use to separate cream from milk?
(a) Fractional distillation
(b) Distillation
(c) Centrifugation
(d) Filtration
Ans – (c) Centrifugation
Q 25 –Which of the following are homogeneous in nature?
(i) Ice
(ii) Wood
(iii) Soil
(iv) Air
(a) (i) and (ii)
(b) (ii) and (iv)
(c) (i) and (iv)
(d) (iii) and (iv)
Ans – (c) (i) and (iv)
Q 26– Which of the following statements is incorrect about physical changes?
(a) There is no gain or loss of energy.
(b) It is permanent and irreversible.
(c) Composition of the substance remains same.
(d) No new substance is formed.
Ans – (b) It is permanent and irreversible.
Q 27 – 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
Ans – (b) are both chemical processes
Q 28 – A colloid with a solid dispersed phase and liquid dispersing medium is called:
(a) Foam
(b) Gel
(c) Sol
(d) Emulsion
Ans – (c) Sol
Q 29 – 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)
(a) liquid at room temperature
Q 30 – Which technique is used to separate blood cells from plasma?
(a) Evaporation
(b) Sublimation
(c) Centrifugation
(d) Filtration
Ans – (c) Centrifugation
Q 31– A solution in which no more solute can be dissolved at a given temperature is known as:
(a) Unsaturated solution
(b) True solution
(c) Dilute solution
(d) Saturated solution
Ans – (d) Saturated solution
Q 32 – Which of the following apparatus is not required in sublimation?
(a) Condenser
(b) Funnel
(c) China dish
(d) Wire gauze
Ans – (a) Condenser
Q 33 – Which of the following method can be used to separate a mixture of camphor and sugar?
(a) Sublimation
(b) Filtration
(c) Distillation
(d) Crystallisation
Ans – (a) Sublimation
Q 34 – The process of separation of insoluble solids from a liquid is called:
( a) Filtration
(b) Decantation
(c) Crystallisation
(d) Evaporation
Ans – (a) Filtration
Q 35– If a solution contains 60 g of common salt in 340 g of water, the mass by mass percentage will be:
(a) 25 %
(b) 15 %
(c) 20 %
(d) 17.6 %
Ans – (b) 15 %
Q 36 – During sublimation of ammonium chloride, pure ammonium chloride gets:
(a) Liquefies to form a solution
(b) Collected on outer sides of the funnel
(c) Collected on inner sides of the china dish
(d) Collected on inner sides of the funnel
Ans – (d) Collected on inner sides of the funnel
Q 37–The size of colloidal particles are:
(a) 10 – 100 nm
(b) 1 – 1000 nm
(c) 10 – 100 um
(d) 10 – 10 m
(b) 1 – 1000 nm
Q 38 –What type of change takes place when a sodium hydroxide pellet is added to water?
(a) Reversible change
(b) Reversible chemical change
(c) Physical change
(d) Chemical change
Ans – (d) Chemical change
Q 37 – State whether the following statements are true or false :-
- The concentration of a solution is the amount of solute present per unit volume or per unit mass of the solution/solvent
- Colloids are homogeneous mixtures.
- The solution is a homogeneous mixture
- The characteristic features of a particular substance obtained from different sources will be different.
- A mixture has a fixed melting point.
- The particles of a suspension can not be filtered out by using filter paper.
- True
- False
- True
- False
- False
- True
Q 38 –During filtration, the solid that remains on the filter paper is called:
(a) Solute
(b) Residue
(c) Solvent
(d) Filtrate
Ans – (b) Residue
Q 39 –The major component of a solution is called:
(a) solute
(b) insoluble
(c) solvent
(d) solution
Ans – (c) solvent
Q 40 – Which of the following has the highest solubility at 313 K?
(a) KNO3
(b) NaCl
(c) KCl
(d) NH4Cl
Ans – (a) KNO3
Q 41 – Which of the following will show the “Tyndall effect”?
(a) Salt solution
(b) Milk and starch solution
(c) Copper sulphate solution
(d) None of them
Ans – (b) Milk and starch solution
Q 42 –A chemical reaction involves in
(a) Only breaking of bonds
(b) Only formation of bonds
(c) Both breaking and formation of bonds
Ans – (c) Both breaking and formation of bonds
Q 43 –Who was the first scientist to use the term ‘element’ in 1661?
(a) Robert Boile
(b) Charles
(c) Antonnie Lorent
(d) None of them
Ans – (a) Robert Boyle
Q 44 –What is the boiling point of acetone?
(a) 196°C
(b) 186°C
(c) 78.3°C
(d) 183°C
Ans – (c) 78.3°C
Q 46– Fill In The Blanks-
- Pure substances can be elements or …………………
- Metals are good ………………. of heat and electricity.
- To separate a mixture of two or more miscible liquids for which the difference in boiling points is less than ………………. fractional distillation method is used.
- The diameter of suspension particles is bigger than ……………..
- ………………. effect originates due to optical properties of a colloidal solution.
- Compounds
- Conductor
- 25 k
- 10−5m
- Tyndall
Q 47 – Match the following
| A 1. Aerosol 2. Foam 3. Emulsion 4. Sol 5. Gel 6. Solid sol |
B (i) Shaving cream, Soap bubbles (ii) Coloured gemstone, milky glass (iii) Jelly, Gelatine and Hair Gel (iv) Milk, face cream (v) Fog, clouds, mist (vi) paints, starch solution |
