A flocculant is a soluble material that is added to a glaze to increase the viscosity and increase the time it takes for the glaze to settle. Among the following ------------------ is used as a flocculant, in water and sewage treatment.
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calcium gluconate
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calcium hexaboride
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calcium hydride
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calcium hydroxide
D
Correct answer
Explanation
Calcium hydroxide, traditionally called slaked lime, is an inorganic compound with the chemical formula Ca(OH)2. It is a colourless crystal or white powder and is obtained when calcium oxide is mixed with water. One significant application of calcium hydroxide is as a flocculant, in water and sewage treatment.