Multiple choice

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.

  1. calcium gluconate

  2. calcium hexaboride

  3. calcium hydride

  4. calcium hydroxide
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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.

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