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To detect the presence of organic impurities in sand, solution of ___________ is used.

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To detect the presence of organic impurities in sand, solution of ___________ is used.

(a) Silver chloride

(b) Sodium acetate

(c) Sodium hydroxide

(d) Calcium carbonate
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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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