Is Matter Around Us Pure
Chapter 2
MULTIPLE CHOICE QUESTIONS:
1. Mixture are constituted by more than one kind of pure form of matter, known a ____.
a) Texture
c) Substance
b) Solution
d) Component
Ans. c) Substance
c) Substance
b) Solution
d) Component
Ans. c) Substance
2. Air is regarded as a mixture because:
a) Its pressure may very
b)Its temperature may change
b)Its temperature may change
c)Its volume changes under different conditions
d)Its composition may vary
Ans. d)Its composition may vary
d)Its composition may vary
Ans. d)Its composition may vary
3. According to the definition of pure substance, which of the following is a pure substance?
a) Ice
c) Iron
b) Mercury
d) All of these
a) Ice
c) Iron
b) Mercury
d) All of these
Ans. d) All of these
4. The components of water can be separated by
a) Physical methods
b) Chemical methods
c) Both
d) They can't be separated
Ans. b) Chemical methods
b) Chemical methods
c) Both
d) They can't be separated
Ans. b) Chemical methods
5. Camphor can be purified by:
a) Distillation
c) Sedimentation
a) Distillation
c) Sedimentation
b) Filtration
d) Sublimation
d) Sublimation
Ans. d)Sublimation
6. The process used to separate oil and water is:
a) Distillation
b) Sublimation
c) Separatingfunnel
d) chromatography
Ans. c) Separatingfunnel
Ans. c) Separatingfunnel
7. Filtration can be used to separate:
a) Solids from solids
b) Liquids from solids
a) Solids from solids
b) Liquids from solids
c)Liquids from liquids
d) Liquids from gases
d) Liquids from gases
Ans. b)Liquids from solids
8. One common method to used separate dyes is:
a) Filtration
b) Distillation
8. One common method to used separate dyes is:
a) Filtration
b) Distillation
d) Conductivity
c) Chromatography
Ans. c)Chromatography
c) Chromatography
Ans. c)Chromatography
9. Mixture can be
a) homogeneous
b) heterogeneous
c) Both (a) and (b)
d) pure substance
c) Both (a) and (b)
d) pure substance
Ans. c) Both (a) and (b)
10. What is true about homogeneous mixture?
a) Homogeneous mixture is the mixture of two or more than two components.
b) In homogeneous mixture the composition and properties are uniform throughout the mixture
c) both (a) and (b)
d) none of the above
Ans. c) both (a) and (b)
11. A ____ is a substance composed of twoor more elements, chemically combined withone another in a fixed proportion.
a)compound
b) Matter
d)Alloy
c) Mixture
Ans. a) compound
12. Dissolved sodium chloride can be separated from water by ____.
a) Chemical process
b) Physical process
c) Chemical process of extraction
c) Chemical process of extraction
d) Physical process of evaporation
Ans. d) Physical process of evaporation
Ans. d) Physical process of evaporation
13. Mixture of two or more metals, or metals and non-metals called as ____.
a) Alloy
c) Mixture
a) Alloy
c) Mixture
b) Solution
d)Metallic mixture
Ans. a) Alloy
14. Distillation is a good separation technique for:
a)Solids
b)Liquids
c)Solid alloys
d)Metallic mixture
Ans. a) Alloy
14. Distillation is a good separation technique for:
a)Solids
b)Liquids
c)Solid alloys
d)Gases
Ans. b)Liquids
Ans. b)Liquids
15. Which of the following is heterogeneous mixture?
a) Air
a) Air
b) Tincture of iodine
c) Sugar solution
d) milk
d) milk
Ans. d) milk
16. Alloy cannot be separated by ____ method
a) Chemical
c) Extraction
b) Evaporation
d) Physical
c) Extraction
b) Evaporation
d) Physical
Ans. d) Physical
17. Component present in large amount in solution called ____.
a) Solute
b) Sugar
c) Solvent
d) Mixture
Ans. c) Solvent
17. Component present in large amount in solution called ____.
a) Solute
b) Sugar
c) Solvent
d) Mixture
Ans. c) Solvent
18. The component of solution that dissolved in solvent called ____.
a) Solute
b) Sugar
c) Solvent
d) Mixture
Ans. a) Solute
19. When no more solute can be dissolved in solution at given temperature is called ____.
a) Homogenous b) Heterogeneous
c) Saturated god) d) Unsaturated
Ans. c) Saturated
19. When no more solute can be dissolved in solution at given temperature is called ____.
a) Homogenous b) Heterogeneous
c) Saturated god) d) Unsaturated
Ans. c) Saturated
20. 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
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
21. What is the name of the metal which I exists in liquid state at room temperature?
a) Sodium
b) Potassium
21. What is the name of the metal which I exists in liquid state at room temperature?
a) Sodium
b) Potassium
d) Bromine
c) Mercury
Ans. c) Mercury
c) Mercury
Ans. c) Mercury
22. Non uniform compositions of solutions called ____ solutions.
a) Mixture
b) Texture
c) Homogenous
d) Heterogeneous
Ans. d) Heterogeneous
Ans. d) Heterogeneous
23. The amount of the solute present in the saturated solution at this temperature is called its ____.
a) Unsaturation
b) Diffusion
c) Collusion
d) Solubility
Ans. d) Solubility
Ans. d) Solubility
24. Which of the following is not physical changes?
a) Melting of iron metal
b) Rusting of iron
c) Bending of an iron rod
d) Drawing a wire of iron metal
Ans. b) Rusting of iron
Ans. b) Rusting of iron
25. If the amount of solute contained in the solution is less than the saturation level, it called as ____.
a) Saturated solution
b) Unsaturated solution
c) Homogenous solution
d) Heterogeneous solution
Ans. b) Unsaturated solution
d) Heterogeneous solution
Ans. b) Unsaturated solution
26. Homogenous solution may separated by ____.
a) Chemical process
b) Physical process
c) filtration
d) Physical process of evaporation
Ans. a) Chemical process
a) Chemical process
b) Physical process
c) filtration
d) Physical process of evaporation
Ans. a) Chemical process
27. Uniform compositions of solutions called ____ solutions.
a) Mixture
b) Texture
c) Homogenous
d) Heterogeneous
Ans. c) Homogenous
Ans. c) Homogenous
28. 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
b) Distillation
c) Centrifugation
d) Filtration
Ans. c) Centrifugation
29. What will you observe when a mixture of iodine and salt is heated in a chine dish
a) Iodine is left behind in the china dish.
b) The mixture starts melting.
c) Salt is left behind in the china dish.
c) Salt is left behind in the china dish.
d) No change in the china dish is observed
Ans. c) Salt is left behind in the china dish.
Ans. c) Salt is left behind in the china dish.
30. Name the mixture whose particles are large enough to scatter light.
a) Colloid
b) True solutions
c) Homogeneous solution
b) True solutions
c) Homogeneous solution
d) All of the above
Ans. a) Colloid
Ans. a) Colloid
31. Mercury and bromine are both
a) liquid at room temperature
b) solid at room temperature
c) gases at room temperature
b) solid at room temperature
c) gases at room temperature
d) both (a) and (b) mile
Ans. a) liquid at room temperature
Ans. a) liquid at room temperature
32. Boron and carbon are
a) metalloids
b) metalloid and non-metal respectively
c) metal
b) metalloid and non-metal respectively
c) metal
d) non-metal and metalloid respectively
Ans. b) metalloid and non-metal respectively
33. In a water-sugar solution
a) water is solute and sugar is solvent
b) water is solvent and sugar solvent is solute
c) water is solute and water is also
d) none of these
a) water is solute and sugar is solvent
b) water is solvent and sugar solvent is solute
c) water is solute and water is also
d) none of these
Ans. b) water is solvent and sugar is solute
34. What is the principle behind the process of centrifugation?
a) Denser particles are forced to the bottom and lighter particles stay at the top when spun rapidly
b) Particles are separated based on the difference in colour
c) Particles are separated based on the difference in temperature
d) Lighter particles are forced to the bottom and denser particles stay at the top when spun rapidly
Ans. a) Denser particles are forced to the bottom and lighter particles stay at the top when spun rapidly
b) Particles are separated based on the difference in colour
c) Particles are separated based on the difference in temperature
d) Lighter particles are forced to the bottom and denser particles stay at the top when spun rapidly
Ans. a) Denser particles are forced to the bottom and lighter particles stay at the top when spun rapidly
35. A colloid is a heterogeneous mixture and its components can be separated by the technique known as
a) Unsaturation
b) Diffusion
c) Collusion d) centrifugation
Ans. d) centrifugation
36. How one can separate ammonium chloride from a mixture containing ammonium chloride and sodium chloride?
a) Precipitation
b) Sublimation
c) Chromatography
d) Cetrifugation
Ans. b) Sublimation
37. 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
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
Ans. b) Sol is a solid-liquid colloid and gel is liquid solid colloid
38. A mixture of two or more miscible liquids, for which the difference in the boiling points is less than 25 K can be separated by the process called ____.
a) Fractional distillation called
b) Sublimation
c) Separatingfunnel
b) Sublimation
c) Separatingfunnel
d) chromatography
Ans. a) Fractional distillation
Ans. a) Fractional distillation
39. A pure substance which is made up of only one kind of atom and cannot be broken | into two or more simpler substances by physical or chemical means is referred to as
a) a compound
c) a molecule
b) an element
d) a mixture
Ans. b) an element
40. When two liquids do not mix, they form two separate layers and are known as
a) Miscible liquids
d) a mixture
Ans. b) an element
40. 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
c) Saturated liquids
d) Super saturated liquids
Ans. b) Immiscible liquids
41. The amount of solute present per unit volume or per unit mass of the solution/solvent is known as
a) Composition of solute
b) Concentration of a solvent
c) Concentration of a solute
d) Concentration of a solution
Ans. d) Concentration of a solution
c) Concentration of a solute
d) Concentration of a solution
Ans. d) Concentration of a solution
42. When light is passed through water !containing a few drops of milk, it shows a bluish tinge. This is due to the scattering of light by milk and the phenomenon is I called ____.
a) Crystallisation b) Tyndall effect
c) Chromatography d)None of these
Ans. b) Tyndall effect
a) Crystallisation b) Tyndall effect
c) Chromatography d)None of these
Ans. b) Tyndall effect
43. In the tincture of iodine, find the solute and solvent?
a) alcohol is the solute and iodine is the solvent
b) iodine is the solute and alcohol is the solvent
a) alcohol is the solute and iodine is the solvent
b) iodine is the solute and alcohol is the solvent
c) any component can be considered as solute or solvent
d) tincture of iodine is not a solution
d) tincture of iodine is not a solution
Ans. b) iodine is the solute and alcohol is the solvent
44. A component present in lesser quantity in solution called____.
a) Solute
b) Sugar
c) Solvent
d) Mixture
Ans. a) Solute
45. Heterogeneous mixture in which the solute particles do not dissolve and remain suspended throughout the solvent and the solute particles can be seen with the naked eye is known as:
a) Colloidal solution
b) Super saturated solution
c) Sublimation
d) Suspensions
Ans. d) Suspensions
Type By- Bikash Bora