IIT-JEE Exam

Partial roasting of chalcopyrite produces
(A) Cu2S and FeO (B) Cu2O and FeO
(C) CuS and Fe2O3 (D) Cu2O and Fe2O3

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IIT-JEE Other Question

Aqueous solutions of HNO3, KOH, CH3COOH, and CH3COONa of identical concentrations are provided.
The pair(s) of solutions which form a buffer upon mixing is(are)
(A) 3 HNO and 3 CH COOH (B) KOH and 3 CH COONa
(C) 3 HNO and 3 CH COONa (D) 3 CH COOH and 3 CH COONa Iron is removed from chalcopyrite as
(A) FeO (B) FeS
(C) Fe2O3 (D) FeSiO3