Environmental Chemistry: Water
Permanent hardness of water is caused due to the presence of dissolved
Calcium hydrogen carbonates
Magnesium hydrogen carbonates
Calcium bicarbonate
Sulphates of magnesium
Sulphates of magnesium
Permanent hardness of water is caused due to the presence of dissolved chlorides and sulphates of calcium and magnesium. These salts do not precipitate out of solution when the water is boiled, hence the name “permanent” hardness. Temporary hardness of water is caused due to the presence of dissolved bicarbonates of calcium and magnesium. These salts can be removed by boiling the water, as the bicarbonates will decompose into carbon dioxide and water, leaving behind the calcium and magnesium ions.
Sulphates of magnesium Permanent hardness of water is caused due to the presence of dissolved chlorides and sulphates of calcium and magnesium. These salts do not precipitate out of solution when the water is boiled, hence the name “permanent” hardness. Temporary hardness of water is caused due to the presence of dissolved bicarbonates of calcium and magnesium. These salts can be removed by boiling the water, as the bicarbonates will decompose into carbon dioxide and water, leaving behind the calcium and magnesium ions.
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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
2 responses to “Permanent hardness of water is caused due to the presence of dissolved”
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Chlorides of magnesium is also correct answer
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updated the question.
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