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