Câu 7: Cho Cu tác dụng với dung dịch axit HCl sẽ có hiện tượng sau: A. D .Không xuất hiện, hiện tượng gì B. B. Chất khí sinh ra làm đục nước vôi trong C. C .Dung dịch sau phản ứng có màu xanh D. Chất khí sinh ra cháy được trong không khí cho ngọn lửa màu xanh

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