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The solution used to test impurities in the sand in field is:(a) Sodium sulphate(b) Sodium hydroxide(c) Sodium nitrate(d) Sodium chlorideI had been asked this question in an online quiz.The above asked question is from Properties of Sand in portion Materials for Construction of Basic Civil Engineering

Answer»

Right option is (b) Sodium hydroxide

Easy explanation: A small amount of sand is ADDED to a solution of sodium hydroxide and stirred.If colour CHANGES to brown, PRESENCE of impurity is detected.



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