{"common":{"save":0,"post_id":"8679","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"8064","mon_id":"1158798","chapter_id":"1158881","post_id":"8679","question":"<p data-pm-slice=\"0 0 []\">Hydrochloric acid \u0111\u1eb7c th\u1ec3 hi\u1ec7n tính kh\u1eed khi tác d\u1ee5ng v\u1edbi ch\u1ea5t nào sau \u0111ây?<\/p>","options":["A. NaHCO3.","B. CaCO3.","C. NaOH.","D. MnO2."],"correct":"4","level":"2","hint":"","answer":"<p>\u0110áp án \u0111úng:<strong> D. MnO2.<\/strong><\/p><p data-pm-slice=\"0 0 []\">HCl \u0111\u1eb7c th\u1ec3 hi\u1ec7n tính kh\u1eed khi \u0111un nóng v\u1edbi MnO2.<\/p><p>Ph\u01b0\u01a1ng trình ph\u1ea3n \u1ee9ng: 4HCl + MnO2 → Cl2 + 2H2O + MnCl2.<\/p>","type":"choose","extra_type":"classic","user_id":"139","test":"0","date":"2025-03-26 09:04:49","option_type":"txt","len":0},{"id":"8065","mon_id":"1158798","chapter_id":"1158881","post_id":"8679","question":"<p data-pm-slice=\"0 0 []\">Hydrochloric acid loãng th\u1ec3 hi\u1ec7n tính oxi hoá khi tác d\u1ee5ng v\u1edbi ch\u1ea5t nào sau \u0111ây?<\/p>","options":["A. FeCO3.","B. Fe.","C. Fe(OH)2.","D. Fe2O3."],"correct":"2","level":"2","hint":"","answer":"<p>\u0110áp án \u0111úng: <strong>B. Fe.<\/strong><\/p><p data-pm-slice=\"0 0 []\">HCl loãng th\u1ec3 hi\u1ec7n tính oxi hóa khi tác d\u1ee5ng v\u1edbi Fe.<\/p><p>Ph\u01b0\u01a1ng trình ph\u1ea3n \u1ee9ng: 2HCl + Fe → FeCl2 + H2.<\/p>","type":"choose","extra_type":"classic","user_id":"139","test":"0","date":"2025-03-26 09:05:46","option_type":"txt","len":1},{"id":"8066","mon_id":"1158798","chapter_id":"1158881","post_id":"8679","question":"<p data-pm-slice=\"0 0 []\">Dung d\u1ecbch HF có kh\u1ea3 n\u0103ng \u0103n mòn thu\u1ef7 tinh là do x\u1ea3y ra ph\u1ea3n \u1ee9ng hoá h\u1ecdc nào sau \u0111ây?<\/p>","options":["A. SiO2 + 4HF → SiF4 + 2H2O.","B. NaOH + HF → NaF + H2O.","C. H2 + F2 → 2HF.","D. 2F2 + 2H2O → 4HF + O2."],"correct":"1","level":"2","hint":"","answer":"<p>\u0110áp án \u0111úng: <strong>A. SiO2 + 4HF → SiF4 + 2H2O.<\/strong><\/p><p data-pm-slice=\"0 0 []\">Th\u1ee7y tinh vô c\u01a1 có thành ph\u1ea7n g\u1ea7n \u0111úng là Na2O.CaO.6SiO2, HF có kh\u1ea3 n\u0103ng \u0103n mòn th\u1ee7y tinh do x\u1ea3y ra ph\u1ea3n \u1ee9ng v\u1edbi SiO2.<\/p><p>SiO2 + 4HF → SiF4 + 2H2O<\/p>","type":"choose","extra_type":"classic","user_id":"139","test":"0","date":"2025-03-26 09:06:55","option_type":"txt","len":2}]}