Exercise II on Water Class 6 Concise Chemistry ICSE Solutions Ch-7. In this article you would learn how to solve Exercise II on Water with hint and reason. Visit official Website CISCE for detail information about ICSE Board Class-6.
Exercise II on Water Class 6 Concise Chemistry ICSE Solutions
| Board | ICSE |
| Publications | Selina Publication |
| Subject | Chemistry |
| Class | 6th |
| Chapter-7 | Water |
| Book Name | Concise |
| Topics | Solution of Exercise II |
| Academic Session | 2025-2026 |
Exercise II on Water
Objective Type Questions
Que-1: Common salt is obtained from sea water by:
(i)distillation
(ii)crystallisation
(iii)evaporation
(iv)sublimation
Ans- evaporation
Reason- Sea water is allowed to evaporate in shallow salt pans. The water evaporates due to the sun’s heat, leaving behind common salt (sodium chloride).
Que-2: The substance which is insoluble in water :
(i)sugar
(ii)salt
(iii)chalk
(iv)sodium carbonate
Ans- chalk
Reason- Chalk does not dissolve in water, so it is insoluble. Sugar, salt, and sodium carbonate dissolve in water and are therefore soluble.
Que-3: A substance in which another substance is dissolved to form a solution is called:
(i)solute
(ii)solvent
(iii)precipitate
(iv)none of the above
Ans- solvent
Reason- A solvent is the substance in which another substance (the solute) is dissolved to form a solution.
Que-4: The most frequently used solvent is:
(i)water
(ii)alcohol
(iii)vinegar
(iv)carbon disulphite
Ans- water
Reason- Water is called the universal solvent because it dissolves a very large number of substances and is the most commonly used solvent in daily life, laboratories, and industries.
Que-5: The substance which gets dissolved in a solvent to form a solution is called :
(i)solute
(ii)residue
(iii)sediment
(iv)sublimate
Ans- solute
Reason- A solute is the substance that gets dissolved in a solvent to form a solution.
Que-6: The solubility of a solute in a solvent:
(i)increases by stirring
(ii)increases by heating
(iii)depends upon the size of the solute particles
(iv)all of the above
Ans- all of the above
Reason-Stirring, heating, and smaller solute particles help the solute dissolve more easily in the solvent, thereby increasing its solubility.
Short Answer Questions
Que-1: Identify the solute and solvent in the following solutions:
(i) Salt and water
(ii) Iodine and alcohol
(iii) Air and water
Ans- (i) Salt and water
(a)Solute: Salt
(b)Solvent: Water
(ii) Iodine and alcohol
(a)Solute: Iodine
(b)Solvent: Alcohol
(iii) Air and water
(a)Solute: Air
(b)Solvent: Water
Que-2: Define:
(i) Solute
(ii) Solvent
(iii) Solution
(iv) Saturated solution
(v) Unsaturated solution
Ans- (i) Solute: A substance that dissolves in a solvent to form a solution is called a solute.
(ii) Solvent: A substance in which a solute dissolves to form a solution is called a solvent.
(iii) Solution: A homogeneous mixture formed by dissolving a solute in a solvent is called a solution.
(iv) Saturated Solution: A solution that cannot dissolve any more solute at a given temperature is called a saturated solution.
(v) Unsaturated Solution: A solution that can still dissolve more solute at a given temperature is called an unsaturated solution.
Que-3: Why is water called a universal solvent ?
Ans- Water is called a universal solvent because it can dissolve a large number of substances more effectively than any other liquid. It dissolves many solids, liquids, and gases, making it the most commonly used solvent.
Long Answer Questions
Que-1: (i) Define solubility.
(ii) State two factors by which the solubility of a solute in a solvent can be increased.
Ans- (i) Solubility is the maximum amount of a solute that can dissolve in a given quantity of a solvent at a particular temperature to form a saturated solution. It is usually expressed as the number of grams of solute that dissolve in 100 g of solvent.
(ii) (a)Increase in Temperature : For most solid solutes, solubility increases with an increase in temperature. Heating the solvent allows more solute to dissolve.
(b)Stirring : Stirring helps the solute particles come into contact with fresh solvent particles, thereby helping more solute to dissolve and increasing the amount dissolved in a given time.
— : End of Exercise II on Water Class 6 Concise Chemistry ICSE Solutions :–
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