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All questions of Methods of Separation in Everyday Life for Class 6 Exam

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Which of the following statements about a mixture is TRUE?
  • a)
    It is a pure substance.
  • b)
    Its constituents are not combined chemically.
  • c)
    Its constituents do not retain their individual properties.
  • d)
    It is always homogeneous.
Correct answer is option 'B'. Can you explain this answer?

Upasana Basak answered
In a mixture, the constituent substances are mixed only physically but not combined chemically. A mixture is not a pure substance as its constituents retain their properties. So, a mixture can be either homogeneous or heterogeneous.

The following flow chart which gives the techniques a student adopted to separate the constituents of a mixture. 

What could R be?
  • a)
    Sugar
  • b)
    Chalk powder
  • c)
    Glass
  • d)
    Oxygen
Correct answer is option 'A'. Can you explain this answer?

Amrita Roy answered
The correct answer is A: Sugar.

- The separation technique shown is crystallization, used to separate solids from a solution.
- Sugar can be separated from a sugar-water solution through crystallization.
- In this process, the sugar is dissolved in water, heated to dissolve more sugar, then cooled to allow sugar crystals to form and separate.
- Chalk powder, glass, and oxygen cannot be separated using crystallization.
R should be a substance which is soluble in water i.e., sugar.

Evaporation followed by condensation occurs in:
  • a)
    Filtration
  • b)
    Sublimation
  • c)
    Evaporation
  • d)
    Distillation
Correct answer is option 'D'. Can you explain this answer?

Dr Manju Sen answered
Distillation is a process that combines evaporation and condensation to separate liquids. Here’s how it works:
  • The liquid is heated, causing it to evaporate into vapour.
  • The vapour is then cooled, leading to condensation back into liquid form.
  • This method is effective for separating mixtures based on their boiling points.
For example, in the distillation of water:
  • Water is boiled to produce steam.
  • The steam is cooled and collected as pure water.
This process is widely used in laboratories and industries for various applications.

X is a separation technique based on the difference in weights of the solids in a solid-solid mixture. What is X?
  • a)
    Sieving
  • b)
    Handpicking
  • c)
    Threshing
  • d)
    Winnowing
Correct answer is option 'D'. Can you explain this answer?

Anjana Rane answered
Correct Answer: D
Solution :
X is winnowing, a process which uses the difference in weights of solids in a solid- solid mixture for separating the components

To obtain salt from seawater, which method is used?
  • a)
    Filtration
  • b)
    Evaporation
  • c)
    Sedimentation
  • d)
    Decantation
Correct answer is option 'B'. Can you explain this answer?

EduRev Class 6 answered
To obtain salt from seawater, the method used is evaporation.
This process involves the following steps:
  • Seawater is heated, which causes the water to evaporate.
  • As the water evaporates, it leaves behind the salt as a solid residue.
  • This method is effective because water has a lower boiling point than salt.
In summary, evaporation is a reliable way to extract salt from seawater by taking advantage of the different boiling points of water and salt.

The process of obtaining clear water from muddy water using alum is called:
  • a)
    Decantation
  • b)
    Filtration
  • c)
    Sedimentation
  • d)
    Loading
Correct answer is option 'D'. Can you explain this answer?

Nishtha Banerjee answered
Understanding the Process of Purification
When we talk about obtaining clear water from muddy water, we refer to a series of processes aimed at separating impurities. One of the most effective methods involves the use of alum, a chemical compound that helps in this purification process.
What is Loading?
- Loading is the process where alum is added to muddy water.
- The alum causes tiny particles in the muddy water to clump together, forming larger particles called flocs.
- This process enhances sedimentation, where these heavier flocs settle at the bottom of the container, leaving behind clearer water.
Steps Involved in the Process
1. Addition of Alum:
- Alum is dissolved in water and mixed with muddy water.
2. Clumping of Particles:
- The positively charged ions in alum attract the negatively charged particles in the muddy water, causing them to stick together.
3. Formation of Flocs:
- The clumped particles form larger flocs that are easier to remove from the water.
4. Sedimentation:
- Over time, these flocs settle down to the bottom of the container due to gravity.
5. Separation:
- The clear water on top can then be carefully decanted or siphoned off, leaving the sediment behind.
Conclusion
In conclusion, while decantation, filtration, and sedimentation are related processes, the term "loading" specifically refers to the addition of alum to initiate the purification process. This crucial step is what makes the transition from muddy water to clear water possible.

Which method is used to separate a mixture of wheat and rice?
  • a)
    Winnowing
  • b)
    Handpicking
  • c)
    Sieving
  • d)
    Sedimentation
Correct answer is option 'C'. Can you explain this answer?

EduRev Class 6 answered
The method used to separate a mixture of wheat and rice is sieving. This process involves:
  • Using a sieve with a mesh of suitable size.
  • Allowing smaller particles, like rice, to pass through.
  • Retaining larger particles, such as wheat.
Sieving is effective for separating mixtures based on particle size. It is commonly used in various applications, including:
  • Removing impurities from flour.
  • Separating pebbles and stones from sand.
In summary, sieving is a practical method for sorting materials with different sizes, making it an essential technique in both cooking and construction.

The salt can be easily obtained from the salty water by the process of:
  • a)
    Evaporation
  • b)
    Condensation
  • c)
    Filtration
  • d)
    Both A and B
Correct answer is option 'A'. Can you explain this answer?

Dr Manju Sen answered
The process of evaporation involves converting water into vapour by heating. This method effectively separates salt from salty water. When the water is boiled, it evaporates, leaving the salt behind.
Key points about evaporation:
  • Evaporation occurs continuously wherever water is present.
  • Sea water contains various salts, including common salt.
  • When sea water is placed in shallow pits, sunlight heats it, causing the water to evaporate.
  • After several days, the water evaporates completely, leaving behind solid salts.
  • Common salt can be obtained from these salts through further purification.
In summary, evaporation is a simple and effective method for extracting salt from water.

A solution of sugar in which some more sugar could be dissolved without changing its temperature is called a/an :
  • a)
    unsaturated solution
  • b)
    saturated solution
  • c)
    solid solution
  • d)
    none of the above
Correct answer is option 'A'. Can you explain this answer?

Pritam Kumar answered
Understanding Solutions
In chemistry, solutions can be classified based on their solute concentration. When discussing sugar solutions, it's important to differentiate between unsaturated and saturated solutions.
Unsaturated Solution
- An unsaturated solution is one where the solvent can still dissolve more solute at a given temperature.
- For example, if you have a glass of water with sugar dissolved in it and you can keep adding more sugar without any leftover at the bottom, this solution is unsaturated.
- The temperature remains constant in this scenario, indicating that the solution can accommodate more solute.
Saturated Solution
- A saturated solution occurs when no more solute can dissolve in the solvent at a specific temperature.
- In this case, if you add sugar and it does not dissolve, remaining at the bottom, the solution is saturated.
- The sugar particles are in equilibrium with the dissolved particles, meaning the solution has reached its maximum solute concentration.
Examples of Solutions
- Unsaturated Solution: A glass of warm water to which you can add more sugar easily.
- Saturated Solution: A glass of cold water where sugar starts to settle at the bottom after reaching the maximum dissolving point.
Conclusion
The correct answer to the question is option 'A' because an unsaturated solution allows for additional solute to dissolve without altering the temperature. Understanding these concepts helps in grasping the basic principles of solubility and solutions.

The essential condition for winnowing activity is:
  • a)
    water
  • b)
    wind
  • c)
    electricity
  • d)
    machines
Correct answer is option 'B'. Can you explain this answer?

Coachify answered
Winnowing is a method used to separate chaff or husk from grains like wheat. This process relies on the application of wind to distinguish between heavier and lighter components.
Key points about winnowing:
  • It is commonly employed by farmers to remove lighter husk particles from heavier seeds.
  • The wind carries away the husk, allowing the seeds to form a heap.
  • The separated husk can be repurposed, for example, as fodder for cattle.
In summary, winnowing effectively uses the natural force of wind to facilitate the separation of different components in a mixture.

What is the process of separating solid particles suspended in a liquid by allowing them to settle down called?
  • a)
    Filtration
  • b)
    Decantation
  • c)
    Sedimentation
  • d)
    Evaporation
Correct answer is option 'C'. Can you explain this answer?

Kunal Ghosh answered
Understanding Sedimentation
Sedimentation is a natural process used to separate solid particles suspended in a liquid by allowing them to settle down due to gravity. This method is commonly applied in various fields including water treatment, mining, and environmental science.
How Sedimentation Works
- Gravity's Role: When a mixture of solid and liquid is left undisturbed, the denser solid particles gradually settle at the bottom of the container. This occurs because gravity pulls the particles downward.
- Time Factor: The rate at which particles settle depends on their size, shape, and density, as well as the viscosity of the liquid. Larger or denser particles settle faster than smaller or lighter ones.
Applications of Sedimentation
- Water Purification: Sedimentation is an essential step in water treatment processes where impurities and suspended solids are removed, leading to cleaner water.
- Industrial Processes: In mining, sedimentation helps in separating valuable minerals from waste material.
Difference from Other Processes
- Filtration: While filtration also separates solids from liquids, it uses a filter medium to physically block solid particles, whereas sedimentation relies on gravity.
- Decantation: This process follows sedimentation; once solids have settled, the clear liquid can be poured off, leaving the sediment behind.
- Evaporation: Evaporation involves converting liquid into vapor to separate dissolved solids, which is entirely different from the settling mechanism of sedimentation.
In summary, sedimentation is an efficient and straightforward method for separating solid particles from liquids, making it a fundamental concept in both science and practical applications.

What method is used to separate tea leaves from prepared tea?
  • a)
    Sedimentation
  • b)
    Filtration
  • c)
    Decantation
  • d)
    Winnowing
Correct answer is option 'B'. Can you explain this answer?

Priyanka Mukherjee answered
Method to Separate Tea Leaves from Prepared Tea
When preparing tea, it is essential to separate the tea leaves from the liquid to enjoy a smooth beverage. The best method for this is filtration.
Understanding Filtration
- Definition: Filtration is a process that uses a barrier to separate solid particles from a liquid or gas.
- Application in Tea Preparation: In tea preparation, a filter (often a tea strainer or a fine mesh sieve) is used to catch the tea leaves while allowing the brewed liquid to pass through.
Why Filtration is the Correct Answer
- Efficiency:
- Filtration effectively separates small tea leaves from the liquid, ensuring that only the brewed tea is served.
- Clarity:
- This method helps achieve a clear liquid, free from unwanted particles, enhancing the drinking experience.
- Ease of Use:
- Using a strainer or filter is quick and practical, making it a convenient choice for most tea drinkers.
Other Methods Explained
- Sedimentation:
- This is the process of allowing heavier particles to settle at the bottom of a liquid. It is not effective for tea leaves, which do not settle quickly.
- Decantation:
- This involves pouring off the liquid from a settled solid. It is less precise since some leaves might still be mixed with the liquid.
- Winnowing:
- This method is used for separating grain from chaff, not applicable to tea leaves.
By using filtration, tea drinkers can enjoy their beverage free from any solid remnants, making it the most suitable method for separating tea leaves from prepared tea.

Which of the following can be used as a filter material?
  • a)
    Cotton
  • b)
    Charcoal
  • c)
    Sand
  • d)
    All of the above
Correct answer is option 'D'. Can you explain this answer?

Charvi Chauhan answered
Understanding Filter Materials
When it comes to filtering substances, various materials can be effectively used. The three options mentioned—cotton, charcoal, and sand—each serve unique purposes in the filtration process.
Cotton
- Cotton is a natural fiber that acts as an excellent filter due to its ability to trap larger particles.
- It is commonly used in simple filtration systems, such as in coffee filters or air purifiers.
Charcoal
- Charcoal, especially activated charcoal, is known for its porous structure, which can absorb impurities and toxins.
- It is widely used in water filtration systems because it effectively removes odors, colors, and harmful chemicals.
Sand
- Sand is another effective filtering material, often used in sand filters for water treatment.
- It can trap particles and sediments, making it essential in both natural and industrial filtration systems.
Conclusion
- Each of these materials—cotton, charcoal, and sand—can be employed in various filtration processes.
- Their unique properties allow them to filter out different types of contaminants effectively.
Thus, the correct answer is option 'D', as all three materials can be used as filter materials in different applications, demonstrating the versatility and importance of filtering in various contexts.

To separate two immiscible liquids, we use:
  • a)
    Filtration
  • b)
    Decantation
  • c)
    Separating funnel
  • d)
    Evaporation
Correct answer is option 'C'. Can you explain this answer?

Sanskriti Bose answered
Understanding Immiscible Liquids
Immiscible liquids are those that do not mix together, such as oil and water. When trying to separate these liquids, specific methods are required to achieve effective separation.
Why Use a Separating Funnel?
A separating funnel is the most efficient tool for separating immiscible liquids. Here’s how it works:
- Design: The funnel has a wide body and a narrow neck, allowing for easy separation of layers.
- Density Difference: Immiscible liquids typically have different densities. For example, oil is less dense than water and will float on top.
- Separation Process:
- Pour the mixture into the separating funnel.
- Allow the liquids to settle into distinct layers.
- Open the stopcock at the bottom to let the denser liquid (usually water) drain out, leaving the lighter liquid (like oil) in the funnel.
Other Methods Explained
- Filtration: This method is used to separate solids from liquids or gases. It is not suitable for immiscible liquids.
- Decantation: This involves pouring off one liquid from another after settling, but a separating funnel provides more precision, especially with smaller volumes.
- Evaporation: This technique is used to separate a soluble solid from a liquid, not for immiscible liquids.
Conclusion
The separating funnel is specifically designed for separating immiscible liquids due to its unique structure and functionality, making it the best choice among the options provided.

The different processes used to separate sand, sawdust, and salt from the mixture dissolved in water are respectively:
  • a)
    sedimentation, filtration and evaporation
  • b)
    filtration, evaporation and condensation
  • c)
    decantation and evaporation
  • d)
    hand picking and evaporation
Correct answer is option 'A'. Can you explain this answer?

Praveen Kumar answered
  • Sedimentation is used to remove sand from water as sand particles settle down easily.
  • Filtration is used to remove sawdust from water as the sawdust can be captured by the filter paper.
  • Evaporation can be used to separate salt from water as the water evaporates and salt is left behind.

The process of separating butter from curd is called:
  • a)
    Filtration
  • b)
    Decantation
  • c)
    Churning
  • d)
    Winnowing
Correct answer is option 'C'. Can you explain this answer?

Vp Classes answered
The process of separating butter from curd is called churning. This method involves:
  • Vigorously stirring or rotating the curd.
  • Separating the butterfat from the liquid, known as buttermilk.
  • Causing the butter to solidify and detach from the buttermilk.
Churning is a common technique used in dairy processing to obtain butter from curd.

How is salt obtained from seawater?
  • a)
    By filtration
  • b)
    By evaporation
  • c)
    By sieving
  • d)
    By handpicking
Correct answer is option 'B'. Can you explain this answer?

Kds Coaching answered
Salt is obtained from seawater through a process of evaporation.
The key steps involved are:
  • Seawater is collected in shallow pools.
  • Sunlight heats the water, causing it to evaporate.
  • As the water evaporates, the salt is left behind.
  • The remaining salt can then be harvested.

Which method is used to separate soluble substances from a liquid?
  • a)
    Filtration
  • b)
    Evaporation
  • c)
    Sieving
  • d)
    Handpicking
Correct answer is option 'B'. Can you explain this answer?

Praveen Kumar answered
Evaporation is the method used to separate soluble substances from a liquid. This process involves the following steps:
  • When a liquid containing a dissolved substance is heated, the liquid evaporates.
  • This leaves behind the soluble substance, such as salt or sugar, as a solid residue.
  • The effectiveness of this method is due to the fact that the solvent, typically water, has a lower boiling point than the dissolved substance.
For example, in the case of sea water:
  • Sea water contains various salts, including common salt.
  • When allowed to stand in shallow pits, sunlight heats the water, causing it to evaporate.
  • After several days, the water completely evaporates, leaving behind solid salts.
  • These salts can then be further purified to obtain common salt.
In summary, evaporation is a crucial method for separating soluble substances from liquids, making it widely used in various applications.

A mixture contains two solids A and B. Solid A is light in weight while solid B is very heavy. Their sizes are almost the same. Here, A is the unwanted component. To get pure solid B, which separation method would you suggest?
  • a)
    Sieving
  • b)
    Winnowing
  • c)
    Magnetic separation
  • d)
    Filtration
Correct answer is option 'B'. Can you explain this answer?

Dr Manju Sen answered
Winnowing is a traditional farming technique used to separate lighter components from heavier ones in a mixture. It is particularly effective for separating grain from chaff.
Key points about winnowing:
  • It involves using air or wind to blow away lighter particles.
  • This method is ideal for heterogeneous solid-solid mixtures.
  • Winnowing is commonly employed by farmers to separate husk from heavier seeds.
  • The lighter husk is carried away by the wind, while the heavier seeds form a pile.
Winnowing is often preceded by threshing, which loosens the grain from its husks and straw. This method is not only effective for grains but can also be adapted for other mixtures.

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