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ICSE Class 9 Water — practice questions

Explore 28 free Water questions in ICSE Class 9 Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Water questions and exercises with answers

Showing questions 1–28 of 28.

Temporary hardness of water is caused by the presence of dissolved:Read the answer and worked solution →Temporary hardness in water can be effectively reduced by:Read the answer and worked solution →Which chemical compounds are the primary cause of permanent water hardness?Read the answer and worked solution →What insoluble precipitate forms when sodium soap is used with hard water?Read the answer and worked solution →Which common household compound has long been used as a water softener?Read the answer and worked solution →In ion-exchange water softening, divalent calcium ions are replaced with:Read the answer and worked solution →How is the hardness of a water sample fundamentally defined?Read the answer and worked solution →Which compound is a principal constituent of hard water scale deposits?Read the answer and worked solution →What term describes a crystalline salt possessing water of crystallization?Read the answer and worked solution →Water of crystallization can generally be removed from a sample by:Read the answer and worked solution →By weight, what proportion of Glauber's salt is water?Read the answer and worked solution →In crystals of CuSO4·5H2O, how many water molecules bind directly to Cu?Read the answer and worked solution →Which analytical technique determines water of crystallization by heating?Read the answer and worked solution →Crystals hosting non-aqueous solvents in their lattice are called:Read the answer and worked solution →At what temperature does pure liquid water reach its maximum density?Read the answer and worked solution →Upon freezing into regular ice, the density of water decreases by about:Read the answer and worked solution →What is the approximate specific heat capacity of liquid water at 20 °C?Read the answer and worked solution →What is the specific enthalpy of fusion (latent heat) of ice at 0 °C?Read the answer and worked solution →What is the gas-phase H-O-H bond angle in a bent water molecule?Read the answer and worked solution →Why is water considered an excellent solvent for ionic compounds?Read the answer and worked solution →When sodium chloride dissolves in water, its ions become:Read the answer and worked solution →Which forces allow water to exhibit capillary action in plants?Read the answer and worked solution →What physical property of water enables small insects to walk on water?Read the answer and worked solution →In autoionization, two liquid water molecules interact to produce:Read the answer and worked solution →Match each water molecule property with its molecular structure:Read the answer and worked solution →Match each solution term with its chemical definition:Read the answer and worked solution →Match each type of water hardness with its chemical salt and removal method:Read the answer and worked solution →Match each crystalline hydrate term with its characteristic compound:Read the answer and worked solution →

Worked practice questions

Temporary hardness of water is caused by the presence of dissolved:

  1. Bicarbonate salts
  2. Chloride minerals
  3. Sulfate crystals
  4. Nitrate compounds
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Correct answer: A. Bicarbonate salts

Dissolved calcium and magnesium bicarbonates cause temporary water hardness.

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Temporary hardness in water can be effectively reduced by:

  1. Simple filtration
  2. Boiling the water
  3. Adding common salt
  4. Aerating the liquid
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Correct answer: B. Boiling the water

Boiling decomposes dissolved bicarbonates, precipitating carbonates and softening water.

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Which chemical compounds are the primary cause of permanent water hardness?

  1. Carbonates and oxides
  2. Nitrates and borates
  3. Sulfates and chlorides
  4. Acetates and fluorides
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Correct answer: C. Sulfates and chlorides

Permanent hardness is primarily caused by dissolved sulfates and chlorides of calcium and magnesium.

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More Chemistry topics

The Periodic TableThe Language of ChemistryAtomic StructureAtmospheric PollutionChemical Changes and ReactionsStudy of Gas LawsStudy of the First Element: HydrogenPeriodic Table