{"common":{"save":0,"post_id":"8559","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"7884","post_id":"8559","mon_id":"1159539","chapter_id":"1159543","question":"<p>\u1ee8ng d\u1ee5ng c\u1ee7a hydrochloric acid là:<\/p>","options":["A. S\u1ea3n xu\u1ea5t gi\u1ea5y, t\u01a1 s\u1ee3i","B. S\u1ea3n xu\u1ea5t ch\u1ea5t d\u1ebbo","C. S\u1ea3n xu\u1ea5t \u1eafc quy","D. S\u1ea3n xu\u1ea5t s\u01a1n"],"correct":"2","level":"3","hint":"<p>Axit này \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong công nghi\u1ec7p hóa ch\u1ea5t \u0111\u1ec3 s\u1ea3n xu\u1ea5t m\u1ed9t lo\u1ea1i polymer ph\u1ed5 bi\u1ebfn, \u1ee9ng d\u1ee5ng r\u1ed9ng rãi trong xây d\u1ef1ng và \u0111\u1eddi s\u1ed1ng.<\/p>","answer":"<p>\u0110áp án \u0111úng: <strong>B. S\u1ea3n xu\u1ea5t ch\u1ea5t d\u1ebbo<\/strong><\/p><p>Axit hydrochloric (HCl) \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong s\u1ea3n xu\u1ea5t <strong data-end=\"159\" data-is-only-node=\"\" data-start=\"131\">PVC (polyvinyl chloride)<\/strong> – m\u1ed9t lo\u1ea1i nh\u1ef1a ph\u1ed5 bi\u1ebfn dùng trong xây d\u1ef1ng, \u1ed1ng n\u01b0\u1edbc, và nhi\u1ec1u s\u1ea3n ph\u1ea9m nh\u1ef1a khác. HCl giúp t\u1ed5ng h\u1ee3p vinyl chloride, nguyên li\u1ec7u chính \u0111\u1ec3 t\u1ea1o ra PVC.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"139","test":"0","date":"2025-03-03 20:10:08","option_type":"txt","len":2},{"id":"7885","post_id":"8559","mon_id":"1159539","chapter_id":"1159543","question":"<p>M\u1ed9t ch\u1ea5t l\u1ecfng không màu có kh\u1ea3 n\u0103ng hóa \u0111\u1ecf m\u1ed9t ch\u1ea5t ch\u1ec9 th\u1ecb thông d\u1ee5ng. Nó tác d\u1ee5ng v\u1edbi m\u1ed9t s\u1ed1 kim lo\u1ea1i gi\u1ea3i phóng hidro và nó gi\u1ea3i phóng khí CO<span class=\"math-tex\">$_{2}$<\/span> khi thêm vào mu\u1ed1i hidrocacbonat. K\u1ebft lu\u1eadn nào d\u01b0\u1edbi \u0111ây là phù h\u1ee3p nh\u1ea5t cho ch\u1ea5t l\u1ecfng ban \u0111\u1ea7u?<\/p>","options":["A. Ki\u1ec1m","B. Baz\u01a1","C. Mu\u1ed1i","D. Axit"],"correct":"4","level":"3","hint":"<p>Ch\u1ea5t l\u1ecfng này làm \u0111\u1ed5i màu ch\u1ea5t ch\u1ec9 th\u1ecb, ph\u1ea3n \u1ee9ng v\u1edbi kim lo\u1ea1i gi\u1ea3i phóng khí và tác d\u1ee5ng v\u1edbi mu\u1ed1i hidrocacbonat t\u1ea1o ra CO\u2082. Hãy suy ngh\u0129 v\u1ec1 tính ch\u1ea5t hóa h\u1ecdc \u0111\u1eb7c tr\u01b0ng c\u1ee7a t\u1eebng nhóm ch\u1ea5t!<\/p>","answer":"<p>\u0110áp án \u0111úng: <strong>D. Axit<\/strong><\/p><p>- Ch\u1ea5t l\u1ecfng làm \u0111\u1ecf ch\u1ea5t ch\u1ec9 th\u1ecb → Có tính axit (th\u01b0\u1eddng là qu\u1ef3 tím ho\u1eb7c phenolphtalein).<\/p><p>- Ph\u1ea3n \u1ee9ng v\u1edbi kim lo\u1ea1i gi\u1ea3i phóng khí H\u2082 → Ch\u1ee9ng t\u1ecf ch\u1ec9 có axit m\u1ea1nh m\u1edbi có tính ch\u1ea5t này v\u1edbi m\u1ed9t s\u1ed1 kim lo\u1ea1i.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"139","test":"0","date":"2025-03-03 20:25:04","option_type":"txt","len":0},{"id":"7886","post_id":"8559","mon_id":"1159539","chapter_id":"1159543","question":"<p>Hoà tan h\u1ebft 3,6 g m\u1ed9t kim lo\u1ea1i hoá tr\u1ecb II b\u1eb1ng dung d\u1ecbch H2SO4 loãng \u0111\u01b0\u1ee3c 3,719 lít H2 (\u0111ktc). Kim lo\u1ea1i là:<\/p>","options":["A. Zn","B. Mg","C. Fe","D. Ca"],"correct":"2","level":"3","hint":"<p>- S\u1eed d\u1ee5ng công th\u1ee9c tính s\u1ed1 mol khí H2 t\u1eeb th\u1ec3 tích.<\/p><p>- D\u1ef1a vào ph\u01b0\u01a1ng trình ph\u1ea3n \u1ee9ng gi\u1eefa kim lo\u1ea1i hóa tr\u1ecb II và H2SO4\u200b, tìm s\u1ed1 mol kim lo\u1ea1i.<\/p><p>- Xác \u0111\u1ecbnh nguyên t\u1eed kh\u1ed1i và so sánh v\u1edbi các \u0111áp án.<\/p>","answer":"<p>\u0110áp án \u0111úng: <strong>B. Mg<\/strong><\/p><p>n<sub>khí<\/sub> = 3,36 : 22,4 = 0,15 mol<\/p><p>G\u1ecdi kim lo\u1ea1i là R (hóa tr\u1ecb II)<\/p><p>R + H<sub>2<\/sub>SO<sub>4<\/sub> <sub>(loãng) <\/sub>→ RSO<sub>4 <\/sub>+ H<sub>2<\/sub><\/p><p>Theo ph\u01b0\u01a1ng trình: n<sub>R <\/sub>= = 0,15 mol<\/p><p>→ M<sub>R<\/sub> = = 24 \u0111vC (Mg)<\/p><p>V\u1eady kim lo\u1ea1i c\u1ea7n tìm là magie (Mg).<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"139","test":"0","date":"2025-03-03 20:26:29","option_type":"txt","len":0}]}