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
it contracts up to 4 °C
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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
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
Water that does not form scum is called
A. hard water
B. soft water
C. dirty water
D. clean water
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