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Unit 1 - Lesson 4 : Water
Unit 1 - Lesson 4 : Water
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1
Water molecule is composed of..........
one oxygen atom and one hydrogen atom.
two oxygen atoms and two hydrogen atoms.
two oxygen atoms and one hydrogen atom.
one oxygen atom and two hydrogen atoms.
2
In a water molecule, oxygen atom combines with two hydrogen atoms by two bonds.
double covalent
ionic
hydrogen
single covalent
3
In a water molecule, the angle between the two hydrogen atoms is.........
64°
104.5°
104
140.5°
4
There are.......... bonds among the water molecules.
ionic
metallic
covalent
hydrogen
5
Water exists in........... in normal temperatures.
liquid state only
gaseous state only
solid state only
All answers are correct
6
Water can dissolve.........
sugar.
table salt.
oil.
table salt and sugar.
7
The high boiling point of water is due to the presence of .......... bonds.
hydrogen
single covalent
double covalent
ionic
8
The snow crystal has.......... shape
pentagonal
hexagonal
octagonal
quadrilateral
9
Ice crystals are characterized by all the following except they have..........
large volume.
high density.
hexagonal shape.
low density.
10
A bottle is filled completely with water and put closed in the freezer. After sometime it breaks, because when water freezes............
its volume increases and its density decreases.
its density increases and its volume decreases.
its volume increases without a change in the density.
its density becomes less than its volume.
11
The density of pure water in a solid state is...........
less than its density in liquid state.
equal to its density in vapour state.
less than its density in vapour state.
greater than its density in liquid state.
12
The pure water boils at.......... °C.
50
100
0
20
13
Water has a/an.......... effect on litmus paper.
basic
neutral
acidic
alkaline
14
All the following are among the properties of water except............
it decomposes by heat into its elements.
its volume increases by freezing.
it is a polar compound.
it has neutral effect on litmus paper.
15
A liquid boils at 100°C. What is the other property, which confirms that it is pure water?............
It evaporates on heating.
It has a neutral effect on litmus paper.
Its density decreases on freezing.
It dissolves table sugar.
16
The electrolysis of acidified water gives hydrogen gas and oxygen gas at a ratio of........... by volume.
1:2
2:1
1:3
2:3
17
In the electrolysis of acidified water by using "Hofmann's voltameter", the volume of hydrogen gas that evolves is (40 cm³), so the volume of oxygen gas that evolves is ...... cm³.
10
40
80
20
18
The volume of hydrogen gas evolving from water electrolysis equals........... the oxygen volume
half
that of
four times
double
19
All the following are natural water pollutants except..........
lightning accompanying thunder storms.
death of living organisms.
discharge of factories residues.
volcanic eruptions.
20
Mixing animals and human wastes with water causes........... pollution.
ehemical
biological
radiant
thermal
21
All the following diseases are caused by biological pollution except.......... disease.
typhoid
bilharzia
cancer
hepatitis
22
The water of a pool contains minerals, oxygen, organic fertilizer, animals wastes and green algae. What is the number of pollutants found in it ?.........
2
1
3
4
23
Increasing the concentration of ........... in drinking water causes blindness.
chlorine
arsenic
lead
mercury
24
Arsenic increases the infection rate by.........
hepatitis.
typhoid.
liver cancer.
brain cancer.
25
........... pollution causes the death of marine creatures due to the separation of the dissolved oxygen from water.
Biological
Chemical
Radiant
Thermal
26
Which of the following behaviours causes radiant pollution ?..........
Discharging of sewage in seas.
No correct answer
Using water in cooling the nuclear reactors.
Leakage of radioactive materials from nuclear reactor.
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