下列化合物中,氧的氧化数为+2的是 A: Cl2O5 B: BrO2 C: HClO2 D: F2O

在下列化合物中，氧元素的氧化数为＋2的是（） A: Cl2O5 B: BrO2 C: HClO2 D: OF2

下列微粒中，不具氧化性的是( ) A: F₂ B: Cl^- C: BrO^- D: I₂

KBr03是一种强氧化剂，在酸性溶液中与还原物质作用，其半反应为 . A: Br0 3 -+6H ++5e==1/2Br 2+3H 20 B: BrO 3 -+6H ++6e== Br -+3H 20 C: BrO 3+3H 20+6e== Br -+60H - D: BrO 3+6H ++e==Br - +3H 20

下列微粒中，不具氧化性的是（） A: F B: Cl C: BrO D: I

找出括号里读音不同的单词。 A: (th)ese B: (th)ey C: bro(th)er D: u>;.(th)ree

32. 在酸性溶液中 KBrO;与过量的 KI 反应，达到平衡时溶液中的 （)。 A: A.两电对BrO=/Br-与I2/2I的电位相等 B: B.反应产物I2与KBr的物质的量相等 C: C.溶液中已无BrO存在 D: D.反应中消耗的KBrO:的物质的量与产物Iz的物质的量之比为1:3

II. Listening to the news reports, (10%) Both the news reports will be spoken twice.News 1 Question 11-12 will be based on news 1. ​​Why couldn’t Jafiar Bro have his metal rods removed? A: Because the surgery had failed. B: Because he did not want to have them removed. C: Because he could not afford it. D: Because he received financial help as a former college athlete.

II. Listening to the news report. (10%)Directions: In this section, you will hear two news reports followed by two or three questions each. News One​浏览器不支持音频​Why couldn't Jafiar Bro have his metal rods removed? A: Because the surgery had failed. B: Because he did not want to have them removed. C: Because he could not afford it. D: Because he received financial help as a former college athlete.

【单选题】NO 2 、NO 2 - 、NO 2 + 键角大小关系正确的是 。 A. NO 2 > NO 2 - >NO 2 + B. NO 2 + >NO 2 >NO 2 - C. NO 2 - > NO 2 >NO 2 + D. NO 2 + > NO 2 - >NO 2