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Water CHEMISTRY - Water

ICSE - STD 8 - CHEMISTRY (ICSE - English Medium). 42 questions in this chapter.

Question types

Water question types

42 questions across 7 question groups — pick any mix to generate a CHEMISTRY paper with step-by-step answer keys.

42
Questions
7
Question groups
5
Question types
Sample Questions

Water questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 11[3 Mark Question Answer]3 Marks
Give balanced equations to show how $–$
$(a)$ Temporary hardness enters into water
$(b)$ Temporary hardness in water can be removed by boiling
$(c)$ Permanent hardness in water can be removed by addition of washing soda.
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Q 12[3 Mark Question Answer]3 Marks
Give a reason why metals are arranged in a series called $–$ ‘activity series of metalsName a metal which reacts with
$(a)$ Cold water
$(b)$ Boiling water
$(c)$ Steam $–$ to liberate hydrogen in each case.
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Q 13[3 Mark Question Answer]3 Marks
Differentiate the function of concentrated sulphuric acid as a drying agent $\&$ as a dehydrating agent. Is fused calcium chloride a dehydrating or a desiccating agent. Give reasons.
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Q 14[3 Mark Question Answer]3 Marks
State how a ‘supersaturated’ solution differs from a ‘saturated solution’. State briefly how you would prepare a supersaturated solution using potassium chloride and water.
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Q 17[5 Mark Question Answer]4 Marks
Differentiate between ‘hydrated’ & ‘anhydrous’ crystals. Give the chemical formula of $–$ the following hydrated crystals$-$
$(a)$ Washing soda
$(b)$ Gypsum
$(c)$ Blue vitriol
$(d)$ Epsom salt
$(e)$ Glauber’s salt. State which crystal from
$(a)$ to $(e)$ is a pentahydrate.
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Q 18MCQ1 Mark
A heterogenous mixture of undissolved particles in dispersion medium, visible to the naked eye.
  • A
    Solvent
  • B
    Colloidal
  • ✓
    Suspension
  • D
    Fused calcium chloride

Answer: C.

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Q 19MCQ1 Mark
A drying agent placed in desiccator.
  • ✓
    Fused calcium chloride
  • B
    Suspension
  • C
    Solvent
  • D
    Colloidal

Answer: A.

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Q 21MCQ1 Mark
A solution which can pass through a filter paper but not through a semipermeable membrane.
  • A
    Suspension
  • B
    Solvent
  • ✓
    Colloidal
  • D
    Fused calcium chloride

Answer: C.

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Q 22MCQ1 Mark
The medium of dissolution which allows the solute to dissolve in it.
  • A
    Colloidal
  • ✓
    Solvent
  • C
    Suspension
  • D
    Washing soda

Answer: B.

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Q 25TRUE / FALSE1 Mark
Solubility of a solute is the $.......... [$minimum$/$maximum$]$ amount of solute that will saturate $100 g$. of water at $t ^{\circ} C$.
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Q 28Match The Following.4 Marks
List $I$ List $II$
$1.$ Green vitriol $A:$ Permanent hardness in water
$2.$ Paint $B:$ Hygroscopic
$3.$ Magnesium chloride $C:$ Temporary hardness in water
$4.$ Magnesium bicarbonate $D:$ Heptahydrate
  $E:$ Colloidal
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