Q1. Which method is used to separate cream from milk?
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Answer: B. Centrifugation
Rapid spinning in a centrifuge forces the denser part down and the lighter cream separates.
Chemistry - Matter & States Questions for SSC CGL (with Answers)
10 Chemistry - Matter & States MCQs from the General Awareness section, with answers and short explanations.
Score: 0 / 0
Q2. Which of the following is a compound?
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Answer: D. Water
Water (H2O) has hydrogen and oxygen combined in a fixed ratio; the others are mixtures.
Q3. Which of the following substances sublimes on heating?
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Answer: C. Camphor
Camphor changes directly from solid to vapour on heating, i.e. it sublimes.
Q4. Which of the following is a homogeneous mixture?
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Answer: D. Sugar dissolved in water
Sugar solution is uniform throughout, so it is a homogeneous mixture.
Q5. What is the process called when a solid changes directly into a gas without becoming a liquid?
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Answer: A. Sublimation
Sublimation is the direct change of a solid into vapour without passing through the liquid state.
Q6. What is 'dry ice'?
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Answer: C. Solid carbon dioxide
Dry ice is solid CO2; it sublimes directly to gas at atmospheric pressure.
Q7. Which of the following will scatter a beam of light (show the Tyndall effect)?
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Answer: A. Milk
Milk is a colloid whose particles are large enough to scatter light; true solutions do not.
Q8. The Indian scientist whose work led to the idea of the Bose-Einstein condensate (a state of matter) is:
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Answer: D. Satyendra Nath Bose
The Bose-Einstein condensate is named after Satyendra Nath Bose and Albert Einstein.
Q9. 20 g of common salt is dissolved in 180 g of water. What is the mass percentage of salt in the solution?
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Answer: B. 10%
Mass % = 20 / (20 + 180) x 100 = 10%.
Q10. Fog is a colloid in which:
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Answer: C. A liquid is dispersed in a gas
Fog is an aerosol: liquid water droplets (dispersed phase) in air (dispersing medium).
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