Class 6 chemistry important questions with answers are provided here for Chapter 4 – Sorting Materials into Groups. These important questions are based on the CBSE board curriculum and correspond to the most recent Class 6 chemistry syllabus. By practising these Class 6 important questions, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 6 annual examinations.
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Class 6 Chapter 4 – Sorting Materials into Groups Important Questions with Answers
Very Short Answer Type Questions
Q-1: Name two materials which are soft.
Answer: Cotton and sponge are the two materials which are soft.
Q-2: What is a translucent material?
Answer: Translucent materials are those that allow objects to be seen but not clearly. For example, Sunglasses, Butter paper.
Q-3: Name two gases that are soluble and insoluble in water.
Answer: Oxygen and carbon dioxide are soluble gases in water. Hydrogen and nitrogen are insoluble in water.
Q-4: Why do we require object grouping?
Answer: Organising the objects into groups allows us to arrange them in a systematic manner. When the objects are grouped, they are easy to manage. Also, it is much easier to understand their properties. Grouping also facilitates the comparison of two objects.
Q-5: Why is water essential for our bodies?
Answer: Water is essential for our bodies because it can dissolve a good range of substances required by the body. It is also an important component of our body’s cells.
Q-6: What do you mean by classification?
Answer: The grouping or sorting of things with similar or dissimilar characteristics or properties is known as classification.
Q-7: Name some objects that are made from wood.
Answer: The chair, table and bullock cart are some objects made from wood.
Q-8: Why do shopkeepers prefer to keep eatables in transparent containers?
Answer: Shopkeepers usually keep biscuits, sweets, and other eatables in glass or transparent containers so that customers can easily see them.
Q-9: Sort the materials that mix well and those that do not mix well with water.
Vinegar, lemon juice, mustard oil, diesel, wheat flour
Answer: Mix well: Vinegar, lemon juice
Not mix well: Mustard oil, diesel, wheat flour
Q-10: Why do some metals dull and lose their lustre?
Answer: Some metals lose their lustre and become dull because they react with the gases and moisture in the air, forming a thin layer of oxide, carbonate, or sulphide.
Q-11: Define the term insoluble.
Answer: Anything that does not dissolve in a given solvent is referred to as insoluble. For example, oil does not dissolve in water.
Q-12: Name the materials that can be used to make a plate.
Answer: Steel, glass, and plastic are examples of materials that can be used to make a plate.
Q-13: Name two non-lustrous materials.
Answer: Cardboard and wood are non-lustrous materials.
Q-14: Name three liquids that are not soluble in water.
Answer: Diesel, petrol and coconut oil are not soluble in water.
Q-15: How are the various objects classified?
Answer: The following characteristics can be used to group various objects:
Size, shape, colour, hardness, water solubility, heat conduction and transparency.
Short Answer Type Questions
Q-1: Describe a technique for demonstrating that water is a transparent material.
Answer: Take a white sheet of paper, a clean beaker, a sketch pen and some clean water. Now, on a white sheet, draw a symbol (say, a “Y”). Place the empty beaker on top of the marked symbol. We can see it clearly now. Fill the beaker halfway with water. Take note of the same mark. The mark is visible once more. This observation demonstrates the transparency of water.
Q-2: What are the criteria for selecting a material to make an object out of?
Answer: We select a material to make an object based on its properties and the intended use of the object. For example, to keep a liquid, we usually use a tumbler. As a result, it would be absurd to make a tumbler out of cloth. A tumbler requires glass, plastics, metal, or another material that can hold water.
Q-3: Explain rough and smooth surfaces using examples.
Answer: Rough surface: Materials with uneven surfaces or edges, such as coal, are examples of rough surfaces.
Smooth surface: Materials with a plain and even surface, such as marble, are said to have a smooth surface.
Q-4: How are materials classified on the basis of their hardness?
Answer: Materials are divided into two categories based on their hardness, as given below:
Soft materials are those that can be easily compressed or scratched, whereas hard materials are those that are difficult to compress. For example, cotton is soft, whereas iron is hard.
Q-5: Describe an experiment that demonstrates that the palm is translucent.
Answer: The steps in the experiment are as follows:
1. In a dark place, cover the glass of a torch with your palm.
2. Turn on the torch.
3. Look at the light from the opposite side of the palm.
The palm allows some light to pass through it, but not all of it. This demonstrates that our palm is translucent.
Q-6: What is the significance of dissolved oxygen gas in water?
Answer: Some gases are soluble in water, whereas others are insoluble. Water dissolves oxygen gas. The oxygen dissolved in water is used for respiration by plants and animals that live in water. Thus, oxygen dissolved in water is critical for the survival of aquatic animals and plants.
Q-7: Why do some substances sink while others float?
Answer: Substances with a relative density greater than water sink in water, whereas substances with a relative density less than water float on water.
Q-8: “Object grouping benefits the shopkeeper.” Justify your claim.
Answer: The proper grouping of objects makes it easier to work. When we go to buy something, the shopkeeper finds it quickly because there are separate shelves for different items, and similar items are kept together. He would never be able to find it so quickly and easily if he randomly placed all of these.
Q-9: Demonstrate that while common salt, sugar, and baking soda are soluble in water, sawdust, chalk powder, and sand are not.
Answer: Take six test tubes and fill them about halfway with water for the experiment. Each of these test tubes should be stored in a test tube stand. Then, in six different test tubes, add a small amount of each of these six substances. Shake them vigorously and set them aside for a few minutes. Sugar, common salt, and baking soda dissolve in water, whereas chalk powder, sawdust, and sand are insoluble in water.
Q-10: You are given three materials: water, sand, and oil. Pouring the three liquids at the same time without disturbing them, how will these liquids be arranged from top to bottom?
Answer: The order of the three materials from top to bottom will be determined by their densities. When compared, oil has the lowest density, and sand has the highest density. The substance with the highest density will be at the bottom, while the substance with the lowest density will be at the top.
This makes the correct arrangement as: oil→water→sand.
Long Answer Type Questions
Q-1: How are materials classified according to their transparency?
Answer: Materials are classified into three types based on their transparency. They are as follows:
a) Transparent: Transparent substances or materials are those that allow things to be seen through them. For example, glass, water, and paper.
b)Translucent: Translucent materials are those that allow objects to be seen but not clearly. For example, Oily paper.
c)Opaque: There are some materials that you cannot see through. These are known as opaque materials. For example, Wood, Cardboard and metal.
Q-2: Discuss important properties of materials that can be used to classify them.
Answer: The following are some important properties of matter:
1. Appearance: Materials can be classified based on how they appear. The appearance of various materials varies.
2. Lustre: The lustre of a material can be used to classify it. Some shine brightly, while others are rather dull.
3.Solubility in water: Substances are classified as soluble or insoluble based on their solubility in water.
4. Transparency: Transparent materials allow almost all light to pass through. Light cannot pass through opaque materials. Translucent materials allow some light to pass through.
5. Density: It is defined as the mass per unit volume of a substance. Some substances float, and others sink in water or other liquids based on their density.
Q-3: How does the appearance of an object assist us in distinguishing between different materials? Use an activity to demonstrate.
Answer: Begin by gathering a variety of small pieces of various materials such as paper, cardboard, wood, copper wire, aluminium sheet, and chalk. Then you must sort the shining materials into groups. Cut each of these materials in half and inspect the freshly cut surface. You’ll notice that the freshly cut surfaces are shining because these objects are made of shiny materials.
You can also use sandpaper to check for lustre on the surface of these materials. Metals with such lustre are typically metals, and examples include copper, iron, aluminium, and gold. As a result, you can distinguish the materials based on their lustre.
Q-4: The following are some examples of objects and materials:
Water, orange, sugar, globe, apple, watermelon and earthen pitcher
Sort the materials on the basis of below criteria.
(a) Round and irregular shapes
(b) Consumables and non-consumables
Answer: Round shapes are objects or materials that have the shape of a circle. Irregular shapes are those which are not regular.
a) Round: Orange, globe, watermelon, earthen pitcher
Irregular shapes: Water, sugar
b) Consumable substances are those that we can eat; otherwise, they are non-consumables.
Consumable: Orange, sugar, apple, water and watermelon.
Non-consumable: Globe and earthen pitcher.
Q-5: Nidhi and Ridhi, two friends, decided to open a new stationary store. They purchased a large number of materials from the main market. Nidhi systematically arranged all of the items based on their similarities and differences. The items were not arranged by Ridhi. She simply arranged them according to the available space in her shop.
(a) What is the purpose of grouping items?
(b) Assume you are a stationer; how will you arrange your products in your store?
(c) Do you believe Nidhi or Ridhi will be able to easily locate items in their shop? Why?
(d) What are the values of Nidhi and Ridhi shown here?
Answer:
a) Grouping items based on their similarities or differences makes it easier to locate objects.
b) As a stationer, I will group similar materials together, such as books, notebooks, and files, and separate dissimilar materials, such as separating books based on class and grade, and storing different brands of pens separately to keep them safer and easy to locate.
c) Nidhi will be able to easily locate items in her shop because she has organised them systematically.
d) Ridhi appears careless, lazy, and inexperienced, whereas Nidhi appears active, professional, and intelligent.
Multiple Choice Type Questions
Q-1: Which of the following substances completely dissolves in water?
a) Chalk powder
b) Sand
c) Sugar
d) Sawdust
Answer: c) Sugar
Explanation: Soluble substances are those that completely dissolve in water. Only sugar is completely soluble or dissolves in water of all the substances listed.
Q-2: Which of the following has a metallic lustre?
a) All materials that have recently cut surfaces
b) Metals with a newly cut surface
c) Metals with any type of surface
d) All materials, regardless of surface
Answer: b) Metals with a newly cut surface
Explanation: Metals are typically lustrous materials. Because of the action of air and moisture on metals, they frequently lose their lustre and appear dull. As a result, we only notice the lustre on their freshly cut surface.
Q-3: Which of the following is a set of translucent materials?
a) Vegetable oil and sunglasses
b) Frosted glass and wood
c) Paper and cardboard
d) Vegetable oil and cardboard
Answer: a) Vegetable oil and sunglasses
Explanation: Vegetable oil, sunglasses, and frosted glass are examples of translucent materials.
Q-4: Which of the following objects shines?
a) Plastic
b) Gold
c) Sulphur
d) Oxygen
Answer: b) Gold
Explanation: Shininess is the property of metals. Gold is the metal, and hence it exhibits lustre.
Q-5: Which of the following is not a benefit of material classification?
a) Understanding the material from which the object is made.
b) To facilitate the study of various objects.
c) Recognise the similarities between the objects.
d) To make object categorisation difficult.
Answer: d) To make object categorisation difficult.
Q-6: Which of the following is not used for making cooking utensils?
a) Steel
b) Aluminium
c) Silver
d) Lead
Answer: d) Lead
Explanation: Lead is not used in the manufacture of cooking utensils because it is reactive in nature and can contaminate food.
Read Also:
- Sorting Materials into Groups
- Group of Materials
- Chapter 4 – Sorting Material into Groups Worksheet – Set -1
- Chapter 4 – Sorting Material into Groups Worksheet – Set -2
- Chapter 4 – Sorting Material into Groups Worksheet – Set -3
- Chemistry Concept Questions and Answers
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