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An Intiative by Sri Chaitanya
a
2FeS +Cu2O→ 2FeO+ Cu2S ; Self reduction
b
2 CuFeS2 +O2 → Cu2S +2 FeS +SO2 ↑ ; Smelting
c
Al2O3 + 2 NaOH→ 2 NaAlO2 + H2O ; Leaching
d
MgCO3→Δ MgO + CO2 ; Calcination
answer is A.
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