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一、选择题(每小题只有一个选项符合题意) 1.酸碱质子理论认为:凡能给出质子(H~+)的物质称为酸;凡能结合质子的物质称为碱。根据这一理论,你认为下列物质中具有两性的是( ) (A)HClO_4 (B)NH_3 (C)CO_3~2 (D)H~+ 2.四氧化三铁若看作“混和氧化物”时可写成FeO·Fe_2O_3;根据化合价规律和上述书写方法,Pb_3O_4若看作“混和氧化物”时可写成( ) (A)PbO·Pb_2O_3 (B)Pb_2O·PbO_3 (D)Pb_2O_2·PbO_2 (D)2PbO·PbO_2 3.某盐Na_2R_2O_3·5H_2O遇酸分解,具有还原性、易被氧化,化学式中两个R原子可以看成处于不同的价态,它是一个常用的还原剂。该盐的重要还原反应如下:2Na_2R_2O_3+I_2=Na_2R_4O_6+2NaI;R_2O_3~(2-)离子的结
First, the multiple-choice questions (only one option per question is consistent with the meaning of the question) 1. Acid-base proton theory that: where can give protons (H ~ +) of the material is called acid; where the substance can bind protons called alkali. According to this theory, you think that the following substances have amphoteric () (A) HClO_4 (B) NH_3 (C) CO_3~2 (D) H~+ 2. If triiron tetraoxide is considered as “mixed oxide” FeO·Fe_2O_3 can be written. According to the law of valence and the above writing method, Pb_3O_4 can be written as “mixed oxide” () (A)PbO·Pb_2O_3 (B)Pb_2O·PbO_3 (D)Pb_2O_2·PbO_2 (D) 2PbO·PbO_2 3. A certain salt Na_2R_2O_3·5H_2O is decomposed by acid, and it is reducible and easy to be oxidized. The two R atoms in the chemical formula can be seen as different valence states, and it is a commonly used reducing agent. The important reduction of the salt is as follows: 2Na_2R_2O_3+I_2=Na_2R_4O_6+2NaI; R_2O_3~(2-) ions