1.

Roasted copper pyrite on smelting with sand produces

Answer»

`FeSiO_3` as fusible SLAG and `Cu_2 S` as matte
`CaSiO_3` as in fusible slag and `Cu_2 O` as matte
`Ca_3 (PO_4)_2` as fusible slag and `Cu_2 S` as matte
`Fe_3 (PO_4)_2` as infusible slag and `Cu_2 S ` as matte

Solution :The roasted COPPER pyrite contain `Cu_2 S` and FeO and some unreacted FeS. On smelting , the roasted copper pyrites with sand give fusible ferros silicate slag, `FeSiO_3` and `Cu_2 S ` as matte.
`FeO + UNDERSET("Silica")(SiO_2) to underset("(slag)")underset("Ferrous silicate")(FeSiO_3)`


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