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Environmental Chemistry: Water
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Environmental Chemistry: Water
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Environmental Chemistry: Water
What is the first step of raw water treatment?
sedimentation
coagulation
filtration
chlorination
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Environmental Chemistry: Water
Water exists in how many states?
1
2
3
4
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Environmental Chemistry: Water
What is given when electricity is passed through acidified water in a voltammeter?
oxygen only
hydrogen only
nitrogen
oxygen and hydrogen
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Environmental Chemistry: Water
Water that does not form scum is called
hard water
soft water
dirty water
clean water
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Environmental Chemistry: Water
What is the percentage of water from oceans?
0
0.002
0.006
0.97
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Environmental Chemistry: Water
Water that does not give scum with soap is called
hard water
soft water
distilled water
alcoholic water
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Environmental Chemistry: Water
Out of total the amount of water available for human use is
0.003
0.002
0.4
0.5
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Environmental Chemistry: Water
What happens to water on cooling?
it expands up to 4 °C
it contracts up to 4 °C
it expands up to 2 °C
it contracts up to 2 °C
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Environmental Chemistry: Water
The third step of sewage water treatment is called
primary sewage treatment
secondary sewage treatment
activated sludge treatment
chlorination
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Environmental Chemistry: Water
The hardness that cannot be removed by boiling is called
temporary hardness
permanent hardness
semi temporary hardness
semi permanent hardness
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