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lan2018
2 năm trước
1/ Giải thích hiện tượng và viết phương trình hóa học xảy ra ( nếu có) cho mỗi trường hợp sau: a) Cho bột KMnO4 vào dd HCl đặc. b) Cho vài mẫu đồng vào dd HCl rồi sục khí O2 liên tục vào. c) Cho NaBr vào dd H2SO4 đặc , nóng . d) Cho hồ tinh bột vào dd NaI sau đó sục khí Cl2 tới dư vào . 2/ Sục khí clo qua dd KI một thời gian dài , sau đó người ta cho hố tinh bột vào thì không thấy xuất hiện màu xanh. Hãy giải thích và viết phương trình hóa học minh họa. GIÚP MÌNH VỚI Ạ <3
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