Environmental Chemistry: Water
Which of the following is an intestinal disease caused by a parasite, entamoeba?
cholera
dysentery
jaundice
hepatitis
dysentery
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Which of the following is the most abundant salt in seawater?A. magnesium chloride
B. calcium chloride
C. sodium chloride
D. sodium nitrate
The hardness that cannot be removed by boiling is called
A. temporary hardness
B. permanent hardness
C. semi temporary hardness
D. semi permanent hardness
The third step of sewage water treatment is called
A. primary sewage treatment
B. secondary sewage treatment
C. activated sludge treatment
D. chlorination
What happens to water on cooling?
A. it expands up to 4 ยฐC
B. it contracts up to 4 ยฐC
C. it expands up to 2 ยฐC
D. it contracts up to 2 ยฐC
Out of total the amount of water available for human use is
A. 0.003
B. 0.002
C. 0.4
D. 0.5
Water that does not give scum with soap is called
A. hard water
B. soft water
C. distilled water
D. alcoholic water
What is the percentage of water from oceans?
A. 0
B. 0.002
C. 0.006
D. 0.97
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