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Which of the following processe (s) during the extraction of copper from chalcopyrites ? (1) Froth floatation (2) Roasting (3) Bassemerisation (4) Lea

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Which of the following processe (s) during the extraction of copper from chalcopyrites ?
(1) Froth floatation (2) Roasting
(3) Bassemerisation (4) Leaching
A. 1, 2
B. 1, 3
C. `1, 2, 3`
D. 3, 4
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Correct Answer - C
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