NEET Chemistry Chapter 2 Is Matter Around Us Question And Answers
Question 1. Air is an example of a mixture. (True/False)
Answer. True
Question 2. Arrange true solution, suspension and colloid in the decreasing order of size of the particles.
Answer. Suspension > Colloids > Solution
Question 3. Smoke and fog both are aerosols. In what way are they different?
Answer. Smoke is Solid in gas type aerosol whereas, Fog is liquid in gas type aerosol.
Question 4. How does increasing the temperature of a solid affect its solubility? Is it same for the gases?
Answer. Solubility of a solid in a liquid increase with temperature whereas, for gases it decreases with an increase in temperature.
Question 5. What is an emulsion?
Answer.
Emulsion
A colloidal solution in which dispersing medium and dispersed phase both are liquid is called emulsion.
Question 6. Give a day-to-day example of Tyndall effect?
Answer. Tyndall Effect can be seen when headlight beams are visible on foggy nights.
Question 7. When will we choose fractional distillation instead of simple distillation process?
Answer. If we want to separate a mixture of two or more miscible liquids whose difference in boiling points is more than 25 K, then fractional distillation process is used.
Question 8. What is the principle of centrifugation?
Answer.
Principle of centrifugation
Centrifugation is based on the principle that when the solution is spun rapidly, then the denser particles will settle at the bottom and lighter particles will float on the top.
Question 9. What is miscibility?
Answer.
Miscibility
Miscibility refers to the ability of a liquid to completely dissolve in another liquid.
Question 10. In crystallization, the liquid left behind after the crystals are formed is called ___________.
Answer. Mother liquor
Question 11. Evaporation is better than crystallization. (True/ False)
Answer. False
Question 12. We can separate miscible liquids using a separating funnel. (True/False)
Answer. False