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Chapters
2: Force and Pressure
3: Light
4: Heat
5: Electricity
6: Sound
7: Magnetism
8: Universe and Space Science
9: Matter around us
10: Changes around us
11: Air
12: Atomic Structure
▶ 13: Water
14: Acids and Bases
15: Chemistry in Everyday Life
16: Microorganisms
17: Plant Kingdom
18: Organisation of Life
19: Movements in Animals
20: Reaching the Age of Adolescence
21: Crop Production and Management
22: Conservation of Plants and Animals
23: Libre Office Calc
![Samacheer Kalvi solutions for Science [English] Class 8 TN Board chapter 13 - Water - Shaalaa.com](/images/science-english-class-8-tn-board_6:5f2b1b2038084cf381bfa42c826a928c.jpg "Samacheer Kalvi solutions for Science [English] Class 8 TN Board chapter 13 - Water")
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Solutions for Chapter 13: Water
Below listed, you can find solutions for Chapter 13 of Tamil Nadu Board of Secondary Education Samacheer Kalvi for Science [English] Class 8 TN Board.
Samacheer Kalvi solutions for Science [English] Class 8 TN Board 13 Water Exercises [Pages 153 - 154]
Choose the correct answer.
Water changes to ice at ______.
0°C
100°C
102°C
98°C
Solubility of carbon dioxide in water is high when the
pressure is low
pressure is high
temperature is high
None of the above
The gas collected at the cathode on electrolysis of water is
oxygen
hydrogen
nitrogen
carbon dioxide
Which of the following is a water pollutant?
Lead
Alum
Oxygen
Chlorine
Permanent hardness of water is due to the presence of _______.
sulphates and chlorides
dust particles
carbonates and bicarbonates
other soluble particles
Fill in the blanks.
Water is colourless, odourless and _______.
The boiling point of water is ______
Temporary hardness of water can be removed by ________ of water.
The density of water is maximum at ________.
Loading speeds up the process of ________.
State true or false. If false, correct the statement.
Sewage should be treated well before being discharged into water bodies.
True
False
Sea water is suitable for irrigation as it contains dissolved salts.
True
False
Excessive use of chemical fertilizers depletes the soil and causes water pollution.
True
False
The density of water will not change at all temperature?
True
False
Soap lathers well in hard water.
True
False
Match the following.
| Universal solvent | Water pollutant |
| Hard water | Kills germs |
| Boiling | Ozonisation |
| Sterilization | Water |
| Sewage | Stomach ailments |
Give a reason for the following.
Alum is added to water in sedimentation tanks.
Give a reason for the following.
Water is a universal solvent.
Give a reason for the following.
Ice floats on water.
Give a reason for the following.
Aquatic animals can breathe in water.
Give a reason for the following.
Sea water is unfit for drinking.
Give a reason for the following.
Hard water is not good for washing utensils.
Define the following.
Freezing point
Define the following.
Boiling point
Define the following.
Specific heat capacity
Define the following.
Latent heat of fusion
Define the following.
Potable water
Answer in brief.
Name the gas evolved at cathode and anode when water is electrolysed. State their ratio by volume.
State the importance of dissolved oxygen and carbon dioxide in water.
What are the causes of temporary hardness and permanent hardness of water?
Explain specific latent heat of vaporization of water.
What are the methods of removing hardness of water?
Answer in detail.
How is water purified at a water purification plant?
What is permanent hardness of water? How can it be removed?
What is Electrolysis? Explain the electrolysis of water.
Explain the different ways by which water gets polluted.
Solutions for 13: Water
Samacheer Kalvi solutions for Science [English] Class 8 TN Board chapter 13 - Water
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Concepts covered in Science [English] Class 8 TN Board chapter 13 Water are Water: Our Lifeline, Composition of Water, Electrolysis of Water, Preparation of Water, Physical Properties of Water, Chemical Properties of Water, Water - a Universal Solvent, Potable Water, Purification of Water, Classification of water: Soft and Hard Water, Advantage and Disadvantage of Hard Water, Removal of Hardness of Water, Water Pollution and Its Causes, Prevention of Water Pollution, Water Pollution in Tamilnadu.
Using Samacheer Kalvi Science [English] Class 8 TN Board solutions Water exercise by students is an easy way to prepare for the exams, as they involve solutions arranged chapter-wise and also page-wise. The questions involved in Samacheer Kalvi Solutions are essential questions that can be asked in the final exam. Maximum Tamil Nadu Board of Secondary Education Science [English] Class 8 TN Board students prefer Samacheer Kalvi Textbook Solutions to score more in exams.
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