Class 9 chemistry MCQs with answers are provided here for chapter 2 Is Matter Around Us Pure?. These MCQs are based on the CBSE board curriculum and correspond to the most recent Class 9 chemistry syllabus. By practising these Class 9 Multiple choice questions, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 9 Annual examinations as well as other entrance exams such as CTET and KVS.
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Class 9 Is Matter Around Us Pure? MCQs
1.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) are true
(d) none of the above
Ans: (c)
Solution: In the homogeneous mixture two or more than two components have same composition and properties throughout the mixture
2. Which of the following properties does not describe a compound?
(a) It is composed of two or more elements
(b) It is a pure substance.
(c) It cannot be separated into constituents by physical means
(d) It is mixed in any proportion by mass
Ans: (d)
Solution: A compound is composed of two or more elements with a fixed proportion by mass. It is pure substance and cannot be separated into constituents by physical means.
3. 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
(c) any component can be considered as solute or solvent
(d) tincture of iodine is not a solution
Ans: (b)
Solution: A solution of iodine in alcohol known as ‘tincture of iodine’ here iodine is the solute and alcohol is the solvent
4. Which of the following is not a homogeneous mixture?
(a) Air (b) Tincture of iodine
(c) Sugar solution (d) milk
Ans: (d)
Solution: Milk is a heterogeneous mixture. It is a colloidal solution of water and fat.
5. What is the statement?
“10 percent glucose in water by mass” signifies.
(a) 10 gram of glucose dissolved in 100 gram of water.
(b) 10 gram of glucose dissolved in 90 gram of water.
(c) 20 gram of glucose dissolved in 200 gram of water.
(d) 20 gram of glucose dissolved in 90 gram of water.
Ans: (b)
Solution: “10 percent glucose in water by mass” signifies that 10 gram of glucose dissolved in 90 gram of water.
6. 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
Ans: (b)
Solution: Sol is a solid-liquid colloid and gel is liquid-solid colloid.
7. Solid solution in which the solute is gas ———–
(a) Copper dissolved in gold
(b) Camphor in nitrogen gas
(c) Solution of hydrogen in palladium
(d) All of the above
Ans: (c)
Solution: Solution of hydrogen in palladium, here solute is hydrogen (gas) and the solvent is palladium.
8. An example of liquid metal and liquid non-metal is
(a) Gallium, mercury
(b) Mercury, chlorine
(c) Mercury, bromine
(d) Bromine, sulphur
Ans: (c)
Solution: An example of liquid metal and liquid non-metal is Mercury and Bromine respectively.
9. Which method is used to separate cream from milk?
(a) Centrifugation (b) Adsorption
(c) Distillation (d) Crystallization
Ans: (a)
Solution: By the process of centrifugation cream is separated from the milk.
10. Which of the statements is incorrect about the physical change?
(a) There is no gain or loss of energy.
(b) It is permanent and Irreversible
(c) Composition of the substance remains the same
(d) No new substance is formed.
Ans: (b)
Solution: It is permanent and Irreversible is the incorrect statement about physical change.
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