Chia hỗn hợp gồm 2 kim loại X, Y có hoá trị không đổi thành 2 phần bằng nhau: Phần 1: Hoà tan hoàn toàn trong dung dịch hỗn hợp gồm HCl và H2SO4 thu được 3,36 lít H2(ở đktc). Phần 2: Hoà tan hoàn toàn trong H2SO4 đặc nóng dư thu được V lít SO2 (ở đktc). Tính giá trị của V.

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