Is Matter Around Us Pure
Class: 9 | Chapter: 2
Multiple Choice Questions
1. 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
2. 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
3. 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
4. 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
5. 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
6. 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
7. Boron and carbon are
(a) metalloids
(b) metalloid and non-metal respectively
(c) metal
(d) non-metal and metalloid respectively
8. 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)
9. Which of the following methods would you use to separate cream from milk ?
(a) Fractional distillation
(b) Distillation
(c) Centrifugation
(d) Filtration
10. 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
11. 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)
12. More than one kind of pure form of matter combines forming
(a) Texture
(b) Solution
(c) Mixture
(d) Component
13. Dissolved sodium chloride can be separated from water by
(a) Chemical process
(b) Physical process
(c) Chemical process of extraction
(d) Physical process of evaporation
14. Non uniform compositions of solutions called
(a) Mixture
(b) Texture
(c) Homogenous
(d) Heterogeneous
15. Uniform compositions of solutions called
(a) Mixture
(b) Texture
(c) Homogenous
(d) Heterogeneous
16. Homogenous solution may separated by
(a) Chemical process
(b) Physical process
(c) filtration
(d) Physical process of evaporation
17. Mixture of two or more metals , or metals and non-metals called as
(a) Alloy
(b) Solution
(c) Mixture
(d) Metallic mixture
18. Alloy cannot be separated by
(a) Chemical method
(b) Evaporation method
(c) Extraction method
(d) Physical method
19. Brass is mixture of
(a) Zinc, carbon
(b) Zinc, Mg
(c) Zinc, Co
(d) Zinc, Copper
20. Component present in large amount in solution called
(a) Solute
(b) Sugar
(c) Solvent
(d) Mixture
21. Air is
(a) Heterogeneous mixture
(b) Gas
(c) Solid
(d) Homogenous mixture
22. When no more solute can be dissolved in solution at given temperature , the solution is
(a) Homogenous
(b) Heterogeneous
(c) Saturated
(d) Unsaturated
23. Mixture of water and milk shows
(a) Solubility
(b) Diffusion
(c) Tyndall
(d) Brightening
24. Colloid is
(a) Saturated
(b) Unsaturated
(c) Homogenous
(d) Heterogeneous
25. Foam is the example of
(a) Scattering light
(b) Colloids
(c) Saturated solution
(d) Unsaturated solutions
26. We can separate the volatile component from its non volatile solute by the method of
(a) Extraction
(b) Separation
(c) Filtration
(d) Evaporation
27. Two immiscible layers can separate out in layer depending on their
(a) Volume
(b) Surface tension
(c) Density
(d) Viscosity
28. Separation of camphor and salt done by
(a) Dissolution
(b) Collusion
(c) Sublimation
(d) Suspension
29. Kroma means
(a) Dyes
(b) Colors
(c) Paints
(d) Natural colors
30. Two miscible liquids having boiling point less than 25K can separated by
(a) Distillation
(b) Sublimation
(c) Suspension
(d) Fractional distillation
31. Boiling point of oxygen is
(a) -280
(b) -183
(c) -130
(d) -220
32. Crystallization method is used to purify
(a) Liquids
(b) Gases
(c) Solids
(d) Miscible liquids
33. Air shows the property of
(a) N2
(b) O2
(c) Both (a) and (b)
(d) None of these
34. Barometer measures
(a) Pressure
(b) Atmospheric pressure
(c) Wind velocity
(d) Gaseous pressure
35. Anemometer measures
(a) Amount of haemoglobin in blood
(b) Pollination of plant by the wind
(c) Wind resistance
(d) Wind speed
36. If we burn graphite
(a) residue will be left
(b) no residue will be left
(c) it will not burn
(d) it will change into diamond
37. Which of the following statements are true for pure substances?
(i) Pure substances contain only one kind of particles
(ii) Pure substances may be compound or mixtures
(iii) Pure substances have the same composition throughout
(iv) Pure substances can be exemplified by all elements other than nickel
(a) (i) and (ii)
(b) (i) and (iii)
(c) (iii) and (iv)
(d) (ii) and (iii)
38. 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)
39. 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)
40. 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)
Answer:
| 1-c | 2-d | 3-d | 4-a | 5-b |
|---|---|---|---|---|
| 6-b | 7-b | 8-c | 9-a | 10-c |
| 11-a | 12-c | 13-d | 14-d | 15-c |
| 16-a | 17-a | 18-d | 19-d | 20-c |
| 21-d | 22-c | 23-c | 24-d | 25-b |
| 26-d | 27-c | 28-d | 29-b | 30-d |
| 31-b | 32-c | 33-c | 34-b | 35-d |
| 36-b | 37-b | 38-c | 39-c | 40-d |