1. Which technique is used to separate the substances from a mixture?
A. Chromatography
B. Racing Forging
C. Assembling
D. None of the above
2. In what way iodine can be separated from a mixture of potassium chloride and iodine?
A. Filtration
B. Sedimentation
C. Distillation
D. Sublimation
3. What is Boron?
A. Non metal
B. metal
C. Compound
D. Metalloid
4. Which of the following statements are correct about metals?
(a) Metals are lustrous.
(b) These are good conductors of heat and electricity.
(c) They can be converted into wire.
(d) They are malleable.
Choose the correct option:
A. Both (a) and (d)
B. Both (a) and (c)
C. Both (c) and (d)
D. All (a). (b), (c) and (d)
5. A mixture of salt and sugar is known as
A. Homogeneous mixture
B. Heterogeneous mixture
C. Mixture of Components
D. None of the above
A. Chromatography
B. Racing Forging
C. Assembling
D. None of the above
2. In what way iodine can be separated from a mixture of potassium chloride and iodine?
A. Filtration
B. Sedimentation
C. Distillation
D. Sublimation
3. What is Boron?
A. Non metal
B. metal
C. Compound
D. Metalloid
4. Which of the following statements are correct about metals?
(a) Metals are lustrous.
(b) These are good conductors of heat and electricity.
(c) They can be converted into wire.
(d) They are malleable.
Choose the correct option:
A. Both (a) and (d)
B. Both (a) and (c)
C. Both (c) and (d)
D. All (a). (b), (c) and (d)
5. A mixture of salt and sugar is known as
A. Homogeneous mixture
B. Heterogeneous mixture
C. Mixture of Components
D. None of the above
ANSWERS:
1. Ans. A
Explanation: Chromatography is one of the most important technique for the separation of a mixture by passing it in solution or suspension through a medium in which the components move at different rates. Mixtures that are suitable for separation by chromatography include inks, dyes and colouring agents in food.
2. Ans. D
Explanation: Sublimation is a chemical process where solid is converted into a gas without going through a liquid stage. At standard, atmospheric pressure, a few solids which will sublime are iodine, carbon dioxide, naphthalene and arsenic.3. Ans. D
Explanation: Some elements show the properties between metals and non-metals and are known as metalloids such as boron, silicon etc.4. Ans. D
Explanation: Metals are lustrous, good conductor of heat and electricity, high density, high melting point, malleable, ductile i.e. can be converted into wire, solid at room temperature etc.5. Ans. B
Explanation: A mixture in which its components do not mix with each other and the distribution of components in different parts of the mixture is not uniform is called heterogeneous mixture.
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