Soal Soal Explanation text

Acid rain is rain that is highly acidic because of sulphur oxides, nitrogen oxides, and other air pollutants dissolved in it. Normal rain is slightly acidic, with a pH of 6. Acid rain may have a pH value as low as 2.8.

Acid rain can severely damage both plant and animal life. Certain lakes, for example, have lost all fish and plant life because of acid rain.

Acid rain comes from sulphur in coal and oil. When they burn, they make sulphur dioxide (SO2 ). Most sulphur leaves factory chimneys as the gaseous sulphur dioxide (SO2 ) and most nitrogen is also emitted as one of the nitrogen oxides (NO or NO2 ), both of which are gases. The gases may be dry deposited–absorbed directly by the land, by lakes or by the surface vegetation. If they are in the atmosphere for any time, the gases will oxidise (gain an oxygen atom) and go into solution as acids. Sulphuric acid (H2 SO4 ) and the nitrogen oxides will become nitric acid (HNO3 ). The acids usually dissolve in cloud droplets and may travel great distances before being precipitated as acid rain. Catalysts such as hydrogen peroxide, ozone and ammonium help promote the formation of acids in clouds. More ammonium (NH4 ) can be formed when some of the acids are partially neutralised by airborne ammonia (NH3 ). Acidication increases with the number of active hydrogen (H+) ions dissolved in acid. Hydrocarbons emitted by for example, car exhausts will react in sunlight with nitrogen oxides to produce ozone. Although it is invaluable in the atmosphere, low level ozone causes respiratory problems and also hastens the formation of acid rain. When acid rain falls on the ground it dissolves and liberates heavy metals and aluminium (Al). When it is washed into lakes, aluminium irritates the outer surfaces of many fish. As acid rain falls or drains into the lake the pH of the lake falls. Forests suffer the effect of acid rain through damage to leaves, through the loss of vital nutrients, and through the increased amounts of toxic metals liberated by acid, which damage roots and soil micro organisms.

Taken from Science and Technology Encycopedia, 1998       

1.    What is the text mainly about?

A.    The definition of acid rain.

B.     The process of acid rain.

C.     The effect of acid rain.

D.    Acid rain.

E.     Rain.

2.      The acid of normal rain is … than the acid rain.

A.    higher

B.     lower

C.     denser

D.    severer

E.     the same

3.      The third paragraph tells about ….

A.    acid rain damages environment

B.     how acid rain endangers life

C.     how acid rain occurs

D.    the cause of acid rain

E.     the acid rain cause

4.      What is the result of the burning of the coal and oil?

A.    ammonium

B.     nitric acid

C.     sulphuric acid

D.    sulphur dioxide

E.     airbone ammonia

5.      The sulphur oxides and nitrogen oxides will …. in the air.

A.    be absorbed directly by the vegetation

B.     dissolved in the lake water and land

C.     emit another sulphur gas

D.    radiate an oxygen atom

E.     gain an oxygen atom

6.      Which of the following is not true about acid rain?

A.    It contains lower pH than the normal rain.

B.     It has higher pH than the normal rain

C.     It can damage animal and plant life.

D.    It contains dangerous gases.

E.     It endangers water life.

7.      ….  is dangerous for the scale of fish in the lake.

A.    Acid rain

B.     Heavy metal

C.     Alumunium

D.    Vital nutrient

E.     Sulphuric acid

8.      What is the purpose of the text?

A.    To report the acid rain in genera.l

B.     To explain the process of acid rain.

C.     To persuade the reader to prevent acid rain.

D.    To discuss the danger of acid rain in the air.

E.     To present two different opinion on acid rain process.

9.      If they are in the atmosphere for any time, …. The italic word can be best replaced by ….

.    oil and coal

B.     land and air

C.     sulphur oxides

D.    nitrogen oxides

E.     sulphur and nitrogen oxides

10.  Acid rain can severely damage both plant and animal life. The bold word has the closest meaning to ….

A.    harm

B.     hang

C.     endow

D.    produce

       E.     develop