State whether the following statement is True or False. Also, correct the False statements. (i) Salt can be separated from a salt solution by evaporation or distillation.
  • True
  • False
State whether the following statement is True or False. Also, correct the False statements. (ii) Distillation can be used for separation of two liquids even when these have the same boiling point.
  • True
  • False
State whether the following statement is True or False. Also, correct the False statements. (iii) In paper chromatography, the solvent level should be above the sample spot at the beginning of the experiment.
  • True
  • False
State whether the following statement is True or False. Also, correct the False statements. (iv) Evaporation and crystallization are the same processes.
  • True
  • False
Activity 5.6: Let us separateStep 2: Let it stand undisturbed. What do you observe? Can you explain why?
  • The mixture separates into layers because the components have different densities.
  • The mixture remains completely mixed because the components have the same density.
  • The mixture evaporates completely leaving no residue.
  • The mixture changes color due to a chemical reaction.
Can you think of any heterogeneous mixtures with a gas as one of the components?
  • Smoke in air
  • Salt dissolved in water
  • Pure oxygen gas
  • Sugar solution
What if two immiscible liquids of the same density are mixed in a separating funnel, how will the layers form?
  • The liquids will not form separate layers and will mix completely.
  • The liquids will form two layers, but the layers will be indistinguishable due to equal density.
  • The liquids will form two layers, but the position of each layer cannot be determined.
  • The liquids will form two layers, with one always on top and the other at the bottom.
Immiscible liquids form two separate layers in a separating funnel because:
  • they have different densities and do not mix with each other.
  • they react chemically to form new substances.
  • they have the same density and mix completely.
  • they dissolve in each other easily.
Sublimation is different from evaporation. Justify.
  • Yes, sublimation and evaporation are different processes.
  • No, sublimation and evaporation are the same process.
  • Sublimation is a type of evaporation.
  • Evaporation only occurs in solids.
Refer to the diagram (Fig. 5.17: Sublimation of camphor). Identify the part labeled 'Glass funnel'.
  • Cotton plug
  • Glass funnel
  • Wire gauze
  • Burner
Fill in the blank: The process in which a solid changes directly to the vapor state without passing through the liquid state is called _______.
  • sublimation
  • condensation
  • melting
  • evaporation
Fill in the blank: On cooling, vapors condense back into a solid without becoming a liquid. This is called _______.
  • deposition
  • evaporation
  • sublimation
  • melting
What are suspensions?
  • Suspensions are heterogeneous mixtures in which solid particles do not dissolve but remain suspended throughout the bulk of the medium.
  • Suspensions are homogeneous mixtures in which solid particles dissolve completely in the medium.
  • Suspensions are solutions where gases are dissolved in liquids.
  • Suspensions are mixtures where all components are invisible to the naked eye.
In a suspension, are the particles of the undissolved substance larger or smaller than the particles present in the solution?
  • Larger
  • Smaller
  • Same size
  • Not visible
Name two examples of suspensions mentioned in the text.
  • Sawdust suspended in water and tea leaves in water.
  • Salt dissolved in water and sugar dissolved in water.
  • Milk and water mixture and lemonade.
  • Copper sulphate solution and vinegar.
How can we separate mud from water if filtration is not enough?
  • By using techniques such as centrifugation and/or coagulation.
  • By boiling the mixture.
  • By adding sugar to the mixture.
  • By freezing the mixture.
What is the process called that involves spinning a mixture in a tube at high speed to separate heavier particles from lighter liquid?
  • Centrifugation
  • Filtration
  • Evaporation
  • Distillation
Centrifugation is widely used in laboratories to separate the components of blood, such as red blood cells and plasma.
  • True
  • False
The spinning game is a folk dance called 'phugadi' in Marathi and 'kikli' in Punjabi. In Hindi, this dance is called:
  • Chakkar
  • Phugadi
  • Kikli
  • Garba
Select the mixture you would like to separate using this mini centrifuge.
  • Blood and plasma
  • Salt and water
  • Sand and iron filings
  • Oil and vinegar
Which of the following is an example of a coagulation process used in everyday life?
  • Making cheese from milk
  • Boiling water
  • Freezing vegetables
  • Baking bread
Fill in the blank: The alum causes the fine suspended particles to clump together. This process is called ________.
  • coagulation
  • evaporation
  • filtration
  • condensation
Blood is neither a solution nor a true suspension. It is a colloid.
  • True
  • False
Which of the following is an example of a colloid?
  • Milk
  • Tomato sauce
  • Ice cream
  • All of the above
What are the main components of blood that are separated after blood donation?
  • Plasma, platelets, white blood cells, red blood cells
  • Plasma, glucose, hormones, red blood cells
  • Platelets, enzymes, antibodies, plasma
  • Red blood cells, lymph, bile, platelets
Blood donation is unsafe and cannot be replaced naturally.
  • True
  • False
What is the main difference between solutions, suspensions, and colloids in terms of particle size?
  • Solutions have the smallest particles (less than 1 nm), colloids have larger particles (1–1000 nm), and suspensions have much larger particles (more than 1000 nm).
  • Solutions have the largest particles, colloids have medium-sized particles, and suspensions have the smallest particles.
  • Colloids have the smallest particles, suspensions have medium-sized particles, and solutions have the largest particles.
  • Suspensions have the smallest particles, solutions have medium-sized particles, and colloids have the largest particles.
Unlike suspension, the particles in a colloid do not settle over time from the mixture. They are uniformly dispersed throughout the mixture as in a solution. True or False: The particles in a colloid settle over time from the mixture.
  • True
  • False
What is the Tyndall Effect?
  • The Tyndall Effect is the scattering of light by particles in a mixture, making the path of light visible.
  • The Tyndall Effect is the absorption of light by a transparent material.
  • The Tyndall Effect is the reflection of light from a mirror surface.
  • The Tyndall Effect is the bending of light as it passes through a lens.
The Tyndall Effect is observed when light passes through a solution with very small particles and the path of light is not visible.
  • True
  • False
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