alleryStart learning →The Calorimetric Test described in §2.2.10 is performed by mixing a sand sample with:
AA 1 percent calcium chloride solution
BA 5 percent hydrochloric acid solution
CA 3 percent sodium hydroxide solution
DA 10 percent ferric chloride solution
Answer & Solution
Correct answer: C. A 3 percent sodium hydroxide solution
1. §2.2.10 reads: 'sample of sand is mixed with a liquid containing 3 percent solution of sodium hydroxide in water.'
2. After 24 hours the developed colour is compared with a standard colour card to assess organic impurities.
_Source: IGNOU ET-522 Block-1 Unit-2 Aggregates, §2.2.10 (Calorimetric Test), p. 24_
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