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The Calorimetric Test described in §2.2.10 is performed by mixing a sand sample with:
A{'text': 'A 1 percent calcium chloride solution', 'label': 'A'}
B{'text': 'A 5 percent hydrochloric acid solution', 'label': 'B'}
C{'text': 'A 3 percent sodium hydroxide solution', 'label': 'C'}
D{'text': 'A 10 percent ferric chloride solution', 'label': 'D'}
Answer & Solution
Correct answer: C. {'text': 'A 3 percent sodium hydroxide solution', 'label': 'C'}
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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