Class 9 Water Mock Test (ICSE)

Topics in Water

• Water as a universal solvent
• Solutions, solubility and solubility curves
• Crystallisation and water of crystallisation
• Hydrated and anhydrous salts
• Hard and soft water and their treatment

Water practice questions with answers

1. Q1Multiple choice·1 mark
   Which of the following salts does not contain water of crystallisation?

   1. (a)Green vitriol
   2. (b)Blue vitriol
   3. (c)Common salt
   4. (d)Washing soda
   Show answer and step marks

   1. Correct option: (c) Common salt+1

   Answer: (c)
2. Q2Multiple choice·1 mark
   Temporary hardness in water is caused by the presence of dissolved:

   1. (a)Bicarbonates of calcium and magnesium
   2. (b)Carbonates of sodium and potassium
   3. (c)Chlorides of calcium and magnesium
   4. (d)Sulphates of calcium and magnesium
   Show answer and step marks

   1. Correct option: (a) Bicarbonates of calcium and magnesium+1

   Answer: (a)
3. Q3Multiple choice·1 mark
   Which of the following characteristics is true for a true solution?

   1. (a)It scatters a beam of light passing through it.
   2. (b)The solute particles are visible to the naked eye.
   3. (c)It is homogeneous and transparent.
   4. (d)Solute particles settle down on keeping undisturbed.
   Show answer and step marks

   1. Correct option: (c) It is homogeneous and transparent.+1

   Answer: (c)
4. Q4Multiple choice·1 mark
   The property of a substance to absorb moisture from the atmospheric air without forming a solution is called:

   1. (a)Sedimentation
   2. (b)Efflorescence
   3. (c)Hygroscopy
   4. (d)Deliquescence
   Show answer and step marks

   1. Correct option: (c) Hygroscopy+1

   Answer: (c)

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