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Unit 1 - Lesson 4 : Water
Unit 1 - Lesson 4 : Water
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1
Water molecule is composed of..........
two oxygen atoms and two hydrogen atoms.
one oxygen atom and one hydrogen atom.
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.
hydrogen
double covalent
single covalent
ionic
3
In a water molecule, the angle between the two hydrogen atoms is.........
64°
104
104.5°
140.5°
4
There are.......... bonds among the water molecules.
ionic
hydrogen
metallic
covalent
5
Water exists in........... in normal temperatures.
All answers are correct
solid state only
liquid state only
gaseous state only
6
Water can dissolve.........
oil.
table salt.
sugar.
table salt and sugar.
7
The high boiling point of water is due to the presence of .......... bonds.
ionic
hydrogen
single covalent
double covalent
8
The snow crystal has.......... shape
quadrilateral
octagonal
hexagonal
pentagonal
9
Ice crystals are characterized by all the following except they have..........
hexagonal shape.
large volume.
high density.
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 without a change in the density.
its density becomes less than its volume.
its density increases and its volume decreases.
its volume increases and its density decreases.
11
The density of pure water in a solid state is...........
greater than its density in liquid state.
equal to its density in vapour state.
less than its density in vapour state.
less than its density in liquid state.
12
The pure water boils at.......... °C.
20
50
100
0
13
Water has a/an.......... effect on litmus paper.
neutral
basic
alkaline
acidic
14
All the following are among the properties of water except............
its volume increases by freezing.
it decomposes by heat into its elements.
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 has a neutral effect on litmus paper.
It dissolves table sugar.
It evaporates on heating.
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
2:3
1:2
1:3
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
20
80
18
The volume of hydrogen gas evolving from water electrolysis equals........... the oxygen volume
four times
that of
half
double
19
All the following are natural water pollutants except..........
death of living organisms.
lightning accompanying thunder storms.
discharge of factories residues.
volcanic eruptions.
20
Mixing animals and human wastes with water causes........... pollution.
ehemical
biological
thermal
radiant
21
All the following diseases are caused by biological pollution except.......... disease.
cancer
bilharzia
hepatitis
typhoid
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 ?.........
3
2
4
1
23
Increasing the concentration of ........... in drinking water causes blindness.
mercury
lead
chlorine
arsenic
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.
Thermal
Radiant
Chemical
Biological
26
Which of the following behaviours causes radiant pollution ?..........
No correct answer
Using water in cooling the nuclear reactors.
Leakage of radioactive materials from nuclear reactor.
Discharging of sewage in seas.
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