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All questions of States of Matter for Grade 2 Exam

Which matter is normally hard?
  • a)
    Liquid
  • b)
    Solid
  • c)
    Gases
  • d)
    All of these
Correct answer is option 'B'. Can you explain this answer?

Sudhir Mehta answered
In the solid state, the individual particles of a substance are in fixed positions with respect to each other because there is not enough thermal energy to overcome the intermolecular interactions between the particles. As a result, solids have a definite shape and volume. Most solids are hard.

State whether the following statement is True or False:
The substance that dissolves in a liquid to form a solution is called a solute.
  • a)
    True
  • b)
    False
Correct answer is option 'A'. Can you explain this answer?

Riya Singh answered
When a substance dissolves in a liquid to make a solution, it is called a solute. For example, when you mix salt in water and it disappears, salt is the solute. This makes the statement TRUE.

Which process would be used to separate sugar from a sugar-water solution?
  • a)
    Filtration
  • b)
    Sedimentation
  • c)
    Evaporation
  • d)
    Decantation
Correct answer is option 'C'. Can you explain this answer?

Understanding the Separation Process
To separate sugar from a sugar-water solution, the most effective method is evaporation. This process takes advantage of the different physical properties of the substances involved.
Why Choose Evaporation?
- Nature of the Mixture: A sugar-water solution consists of sugar dissolved in water. The sugar molecules are evenly distributed in the water, creating a homogeneous mixture.
- Physical Change: Evaporation is a physical change where the liquid (water) turns into vapor when heated. This process allows the solid (sugar) to remain behind.
Steps in the Evaporation Process:
1. Heating: The sugar-water solution is heated in a container. As the temperature rises, the water begins to evaporate.
2. Vaporization: Water molecules gain enough energy to escape into the air, leaving the sugar behind.
3. Concentration of Sugar: As more water evaporates, the solution becomes more concentrated until only sugar remains.
4. Completion: Eventually, all the water evaporates, resulting in solid sugar.
Why Not Other Methods?
- Filtration: This method separates solids from liquids but is ineffective here since sugar is dissolved.
- Sedimentation: This process relies on heavier particles settling at the bottom. Sugar is not heavy enough to settle.
- Decantation: This method separates liquids from solids or different liquid layers but won’t work for dissolved sugar.
Conclusion
Evaporation is the best method to separate sugar from a sugar-water solution due to its effectiveness in utilizing the physical properties of solubility and boiling points.

What is the role of a solute in a solution?
  • a)
    To dissolve the solvent
  • b)
    To form a mixture with the solvent
  • c)
    To evaporate from the solution
  • d)
    To separate from the solvent
Correct answer is option 'B'. Can you explain this answer?

A solute is a substance that dissolves in a solvent to form a solution. For example, when sugar is added to water, it dissolves (solutes) to form a sweet solution. The solute integrates into the solvent to create a uniform mixture.

What is the main reason why gases are highly compressible compared to liquids and solids?
  • a)
    High density
  • b)
    Low intermolecular space
  • c)
    High kinetic energy
  • d)
    Large intermolecular space
Correct answer is option 'D'. Can you explain this answer?

Freak Artworks answered
Gases are highly compressible because they have large intermolecular spaces between particles, allowing them to be compressed into a smaller volume. This is due to the negligible forces of attraction between gas particles.

Which state of matter is characterized by the highest rate of diffusion?
  • a)
    Solid
  • b)
    Liquid
  • c)
    Gas
  • d)
    Plasma
Correct answer is option 'C'. Can you explain this answer?

Subset Academy answered
Gases exhibit the highest rate of diffusion because their particles are widely spaced and move freely, allowing them to mix rapidly with other gases. This high mobility contrasts with the slow diffusion in solids and liquids.

What is the state of matter that takes the shape of its container?
  • a)
    Plasma
  • b)
    Solid
  • c)
    Liquid
  • d)
    None of these
Correct answer is option 'C'. Can you explain this answer?

Liquids are cool because they can change their shape to fit into any container they are poured into. Imagine pouring juice from a glass to a bowl - the juice takes the shape of the bowl. That's what liquids do!

What changes occur to the molecules of a substance during evaporation?
  • a)
    They move closer together
  • b)
    They move further apart
  • c)
    They become more rigid
  • d)
    They lose their energy
Correct answer is option 'B'. Can you explain this answer?

During evaporation, the molecules of a substance move further apart as they gain enough energy to escape the liquid state and enter the gas phase. This process involves an increase in kinetic energy and movement of molecules.

What method is used to separate a mixture of sand and water?
  • a)
    Filtration
  • b)
    Evaporation
  • c)
    Sedimentation and Decantation
  • d)
    Condensation
Correct answer is option 'C'. Can you explain this answer?

Sedimentation and decantation are used to separate sand from water. Sand settles at the bottom of the glass, and the clear water can be poured off, leaving the sand behind. This method is effective for separating insoluble solids from liquids.

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