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The solution used to test impurities in the sand in field is:

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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 chloride

I 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

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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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