To detect the presence of organic impurities in sand, solution of ___________ is used.(a) Silver chloride(b) Sodium acetate(c) Sodium hydroxide(d) Calcium carbonateThe question was asked during an online interview.My question comes from Mortar topic in chapter Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials

To detect the presence of organic impurities in sand, solution of ____

1.	To detect the presence of organic impurities in sand, solution of ___________ is used.(a) Silver chloride(b) Sodium acetate(c) Sodium hydroxide(d) Calcium carbonateThe question was asked during an online interview.My question comes from Mortar topic in chapter Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials
Answer» RIGHT choice is (c) Sodium hydroxide To explain: To detect the PRESENCE of organic IMPURITIES in sand, the solution of sodium hydroxide is used. If the COLOUR of the solution changes to brown, it INDICATES the presence of organic matter in the sand.

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