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Going out with friends is my favorite hobby in my free time . I often going out with my friends for eating and chatting. I love chatting with my closed friends, I can share all my stories with them. It’s always filled with laughter and I feel very happy when I am with my friends.

Watching television is one of the activities I like to do in my spare time. I enjoy watching cartoons on Saturday mornings and sports programs on Sunday afternoons. I also watch television during the week after I have finished all my school work. At night, I especially like to watch movies and situation comedies. If I have a lot of homework, I try to arrange my schedule so that I can watch at least one of my favorite shows. Watching television is not the only activity that I do in my spare time. My other favorite activities are making paper flowers and going shopping with my friends. However, when I have spare time, I spend more time watching television than any other activities. Watching television can help me not only relax but also build me a huge knowledge of the open world.”

Cho các thí nghiệm sau:

(a) Cho dung dịch Ca(OH)₂ dư vào dung dịch Ca(HCO₃)₂.

(b) Cho dung dịch Ba(OH)₂ dư vào dung dịch Al₂(SO₄)₃.

(c) Cho dung dịch HCl dư vào dung dịch NaAlO₂.

(d) Dẫn khí CO₂ dư vào dung dịch NaAlO₂.

(e) Cho dung dịch NaOH dư vào dung dịch AlCl₃.

(f) Cho dung dịch NH₃ dư vào dung dịch Al₂(SO₄)₃.

(g) Cho dung dịch AgNO₃ vào dung dịch Fe(NO₃)₂.

Số thí nghiệm không thu được kết tủa là:

A. 2.

B. 3.

C. 1.

D. 4.

Cho sơ đồ phản ứng: C₂H₂ → + H 2 + Pb / PbCO 3 , t o C  X → + O 2 , xt   PbCl 2 / CuCl 2 Y → + O 2 / Mn 2 +  Z.

Trong đó: X, Y, Z, T là các hợp chất hữu cơ. Vậy X và Z là

A. etilen và etanol

B. etan và axit axetic

C. etan và etanal

D. etilen và axit axetic