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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.
it decomposes by heat into its elements.
its volume increases by freezing.
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.
It has a neutral effect on litmus paper.
It dissolves table sugar.
Its density decreases on freezing.
3
The electrolysis of acidified water gives hydrogen gas and oxygen gas at a ratio of........... by volume.
2:1
1:2
2:3
1:3
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
10
20
80
5
The volume of hydrogen gas evolving from water electrolysis equals........... the oxygen volume
double
half
four times
that of
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 ?.........
4
3
2
1
7
Increasing the concentration of ........... in drinking water causes blindness.
arsenic
lead
chlorine
mercury
8
Arsenic increases the infection rate by.........
hepatitis.
brain cancer.
typhoid.
liver cancer.
9
........... pollution causes the death of marine creatures due to the separation of the dissolved oxygen from water.
Chemical
Radiant
Thermal
Biological
10
Which of the following behaviours causes radiant pollution ?..........
No correct answer
Discharging of sewage in seas.
Leakage of radioactive materials from nuclear reactor.
Using water in cooling the nuclear reactors.
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