Câu 1. Cho 12 gam hỗn hợp gồm hai kim lọai đồng và sắt tan hoàn toàn trong dung dịch H2SO4 đặc nóng thu được 5,6 lít khí SO2 (đktc). Hàm lượng phần trăm theo khối lượng của sắt và khối lượng của các muối trong dung dịch thu được là: A. 46,67% và 36 g B. 54,33% và 36 g. C. 46,67% và 56 g. D. 54,33% và 56 g.

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