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Unit 1 - Lesson 4 : Water
Unit 1 - Lesson 4 : Water
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1
All the following are among the properties of water except............
it is a polar compound.
its volume increases by freezing.
it decomposes by heat into its elements.
it has neutral effect on litmus paper.
2
A liquid boils at 100°C. What is the other property, which confirms that it is pure water?............
It evaporates on heating.
Its density decreases on freezing.
It dissolves table sugar.
It has a neutral effect on litmus paper.
3
The electrolysis of acidified water gives hydrogen gas and oxygen gas at a ratio of........... by volume.
2:1
1:3
1:2
2:3
4
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.
40
20
80
10
5
The volume of hydrogen gas evolving from water electrolysis equals........... the oxygen volume
that of
half
double
four times
6
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
4
2
1
7
Increasing the concentration of ........... in drinking water causes blindness.
lead
mercury
arsenic
chlorine
8
Arsenic increases the infection rate by.........
hepatitis.
typhoid.
brain cancer.
liver cancer.
9
........... pollution causes the death of marine creatures due to the separation of the dissolved oxygen from water.
Radiant
Chemical
Biological
Thermal
10
Which of the following behaviours causes radiant pollution ?..........
Leakage of radioactive materials from nuclear reactor.
Discharging of sewage in seas.
No correct answer
Using water in cooling the nuclear reactors.
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