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What is the content of SiO2 in fly ash?

(a) 30-60%

(b) 15-30%

(c) Up to 30%

(d) 1-7%

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Correct choice is (a) 30-60%

To explain: The content of SiO2 in fly ash has been tested according to procedures specified in IS: 1727-1967.

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