Water for drinking can come from several sources including reservoirs, rivers and boreholes. What needs to be done to water from boreholes to ensure that it is suitable for drinking?
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It needs to be filtered
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It needs to be disinfected with chlorine
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It needs to have chemicals added to it to remove impurities
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It needs to be neutralized
Q.2.
There are five steps in the treatment of water. What is the first step in the treatment process?
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Adding aluminum sulfate and lime to make dirt clump together, making the dirt sink
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Removing large objects
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Adding chlorine and checking the pH
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Passing it through a special filter to remove particles of grit
Q.3.
What is the second step?
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Adding aluminum sulfate and lime to make dirt clump together, making the dirt sink
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Removing large objects
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Adding chlorine and checking the pH
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Passing it through a special filter to remove particles of grit
Q.4.
The third step is...
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adding aluminum sulfate and lime to make dirt clump together, making the dirt sink
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removing large objects
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adding chlorine and checking the pH
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removing sand and soil
Q.5.
The next step is...
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adding aluminum sulfate and lime to make dirt clump together, making the dirt sink
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removing large objects
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adding chlorine and checking the pH
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removing sand and soil
Q.6.
The final step in the water treatment process is...
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adding aluminum sulfate and lime to make dirt clump together, making the dirt sink
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removing large objects
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adding chlorine and checking the pH
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removing sand and soil
Q.7.
Some people use filter jugs in their homes. These jugs have a top part where the water is put in and passes through the filter. Which of the following are NOT usually found in the filters in these jugs?
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Silver
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Charcoal
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Ion-exchange resin
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Chlorine
Q.8.
What does the carbon in the filter do?
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Removes any solid materials from the water
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Reduces the levels of chlorine, pesticides and other organic impurities in the water
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Discourages the growth of bacteria within the filter
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Removes calcium, magnesium, lead, copper and aluminum ions from the water
Q.9.
The water passed through the treatment process is not pure water. How can we produce pure water?
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Filter it again
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Distill it
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Disinfect it again
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Remove any solid materials
Q.10.
De-ionising is an alternative method to produce pure water. How does it work?
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It removes all ions except H+ and OH- ions
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It removes all ions except Ca2+ and OH- ions
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It removes all ions except H+ and Mg2+ ions
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It adds Mg2+ ions and H+ ions
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