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What percentage of SiO2 is present in Indian pyrite ore?

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What percentage of SiO2 is present in Indian pyrite ore?

(a) 5-7%

(b) 10-12%

(c) 16-19%

(d) 20-21%

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I would like to ask this question from Inorganic Chemical in division Inorganic Chemical Industries of Chemical Technology

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The correct choice is (a) 5-7%

Explanation: Indian pyrite ore at Amjhore contains 5-7% of SiO2 and requires either floatation initially or extra limestone to flux out the silica.

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