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To avoid trapped air produced by clay flocculation, we used ___ in distilled water.

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To avoid trapped air produced by clay flocculation, we used ___ in distilled water.

(a) (NaPO3)6

(b) Na4P2O7

(c) Na5P3O10

(d) PO4

I had been asked this question in a national level competition.

My question is taken from Elastic Properties of Aggregates in division Elasticity, Creep and Shrinkage of Concrete Technology

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Correct choice is (a) (NaPO3)6

Easy explanation: To avoid trapped air produced by clay flocculation, we used sodium hexametaphosphate in distilled water.

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