Discussion
Pyrite in a rock or aggregate is troublesome because on oxidation it produces
Answer: C
Correct answer: sulphuric acid and sulphate
Pyrite is iron sulphide, and on exposure to air and moisture it oxidises to iron oxide and sulphuric acid, the acid then reacting with the cement to form sulphates. The products occupy more volume than the pyrite did, so the aggregate expands and stains, and the sulphate attacks the paste as well.
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