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Which of the following is not used as a coagulant in lime-soda process?

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Which of the following is not used as a coagulant in lime-soda process?

(a) Alum

(b) Calcium bicarbonate

(c) Aluminium sulphate

(d) Sodium aluminate

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This interesting question is from Lime Soda Process in chapter Water and its Treatment of Engineering Chemistry II

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The correct choice is (b) Calcium bicarbonate

Easiest explanation: Calcium bicarbonate is not used as a coagulant in lime-soda process. Alum, aluminium sulphate and sodium aluminate are used as coagulants in lime-soda process.

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