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Câu hỏi được chia sẻ mới nhất

Tiến hành thí nghiệm theo các bước sau: + Bước 1 : Cho 3 – 4 ml dung dịch AgNO 3 2% vào hai ống nghiệm (1) và (2). Thêm vài giọt dung dịch NaOH loãng, cho amoniac loãng 3% cho tới khi kết tủa tan hết (vừa cho vừa lắc). + Bước 2 : Rót 2 ml dung dịch saccarozơ 5% vào ống nghiệm (3) và rót tiếp vào đó 1 ml dung dịch H 2 SO 4 20%. Đun nóng dung dịch trong 3 – 5 phút. + Bước 3 : Để nguội, cho từ từ NaHCO 3 tinh thể vào ống nghiệm (3) và khuấy đều bằng đũa thủy tinh cho đến khi ngừng thoát khí CO 2 . + Bước 4 : Rót nhẹ tay 2 ml dung dịch saccarozơ 5% theo thành ống nghiệm (1). Đặt ống nghiệm (1) vào cốc nước nóng (khoảng 60 – 70°C). Sau vài phút, lấy ống nghiệm (1) ra khỏi cốc. + Bước 5 : Rót nhẹ tay dung dịch trong ống nghiệm (3) vào ống nghiệm (2). Đặt ống nghiệm (2) vào cốc nước nóng (khoảng 60 – 70°C). Sau vài phút, lấy ống nghiệm (2) ra khỏi cốc. Cho các phát biểu sau: (a) Mục đích chính của việc dùng NaHCO 3 là nhằm loại bỏ H 2 SO 4 có trong dung dịch. (b) Sau bước 2, dung dịch trong ống nghiệm tách thành hai lớp. (c) Ở bước 1, có thể thay NaOH loãng bằng KOH loãng. (d) Ở bước 3, việc để nguội dung dịch là không cần thiết, có thể tiến hành ngay. (e) Sau bước 4, thành ống nghiệm (1) có lớp bạc sáng bóng (g) Sau bước 5, thành ống nghiệm (2) có lớp bạc sáng. Số phát biểu đúng là:

<p>Hai chất hữu cơ mạch hở <strong>E</strong>, <strong>F</strong> có cùng công thức đơn giản nhất C<sub>3</sub>H<sub>4</sub>O<sub>2</sub> và M<sub>E</sub> &lt; M<sub>F</sub> &lt; 146. Các chất <strong>E</strong>, <strong>F</strong>, <strong>X</strong>, <strong>Z</strong> tham gia các phản ứng sau theo đúng tỉ lệ mol:<br>(a) <strong>E</strong> + NaOH <img src="data:image/png;base64,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 "><strong>X</strong> + <strong>Y</strong>.&nbsp;</p><p>(b) <strong>F</strong> + NaOH <img src="data:image/png;base64,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 "><strong>Z</strong> + <strong>T</strong><br>(c) <strong>X</strong> + HCl <img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABMAAAANCAYAAABLjFUnAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADOSURBVDhPrZIxCoNAEEX3KgbrWBkr7yH25gAWtl7AaKGYSjyM2lgomhNY2Eaw1x/QISREAxPy4MPsLx7sMAJ/hCWb55mmbViyPM9xjWN6fcKSdV2Hk6rCdV1q3mHvrKoqyLIM27YxjiO1K09Z0zQIw3BJFEW7SZIEhmFACAFN01CWJRleZHVdw/f9JUEQ7CZNU5imuciOioIsy8jwwzdvbYuDJMGyzrgPA7UrLFnf99B1HY7jbJ4JS1YUBTzvsntvLNk0TTRtw97ZN/4oAx7BCpdeOVd1SwAAAABJRU5ErkJggg== "><strong>U</strong> + NaCl.</p><p>(d) <strong>Z</strong> + HCl <img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABMAAAANCAYAAABLjFUnAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADOSURBVDhPrZIxCoNAEEX3KgbrWBkr7yH25gAWtl7AaKGYSjyM2lgomhNY2Eaw1x/QISREAxPy4MPsLx7sMAJ/hCWb55mmbViyPM9xjWN6fcKSdV2Hk6rCdV1q3mHvrKoqyLIM27YxjiO1K09Z0zQIw3BJFEW7SZIEhmFACAFN01CWJRleZHVdw/f9JUEQ7CZNU5imuciOioIsy8jwwzdvbYuDJMGyzrgPA7UrLFnf99B1HY7jbJ4JS1YUBTzvsntvLNk0TTRtw97ZN/4oAx7BCpdeOVd1SwAAAABJRU5ErkJggg== "><strong>V</strong> + NaCl.<br>Biết <strong>X</strong>, <strong>Y</strong>, <strong>Z</strong>, <strong>T</strong>, <strong>U</strong>, <strong>V</strong> là các chất hữu cơ, trong đó <strong>T</strong> đa chức. Cho các phát biểu sau:<br>(1) Chất <strong>U</strong> có nhiều trong nọc độc kiến.<br>(2) Từ <strong>Y</strong> có thể điều chế trực tiếp được axit axetic.<br>(3) Ở nhiệt độ thường, <strong>T</strong> tác dụng với Cu(OH)<sub>2</sub> tạo dung dịch xanh lam.<br>(4) <strong>E</strong> và <strong>F</strong> đều tạo kết tủa khi cho tác dụng với AgNO<sub>3</sub> trong dung dịch NH<sub>3</sub>.&nbsp;<br>(5) Đun nóng rắn <strong>Z</strong> với vôi tôi xút thu được khí etilen.<br>Số phát biểu <strong>đúng</strong> là:</p>

<p>Cho sơ đồ chuyển hoá: Triolein <img src="data:image/png;base64,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 "><strong>X </strong><img src="data:image/png;base64,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"><strong> Y </strong><img src="data:image/png;base64,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"><strong> Z</strong>.&nbsp;</p><p>Biết <strong>Z</strong> là chất hữu cơ. Chất <strong>Z</strong> là:</p>