题目

常温下,下列三个反应均能发生:X2+2W2+═2X﹣+2W3+;Z2+2X﹣═2Z﹣+X2;2W3++2Y﹣═2W2++Y2.则在相同条件下,下列三个反应:①Y2+2X﹣═2Y﹣+X2;②Z2+2Y﹣═2Z﹣+Y2;③2W3++2Z﹣═2W2++Z2也能发生的是( ) A.只有①   B.只有②   C.①和②   D.②和③ 答案:【考点】B2:氧化性、还原性强弱的比较. 【分析】反应X2+2W2+═2X﹣+2W3+,则得出氧化性关系X2>W3+;Z2+2X﹣═2Z﹣+X2,则得出氧化性关系Z2>X2;2W3++2Y﹣═2W2++Y2,则得出氧化性关系W3+>Y2,所以单质的氧化性顺序是:Z2>X2>W3+>Y2,满足该氧化性顺序即可发生. 【解答】解:反应X2+2W2+═2X﹣+2W3+,则得出句型转换 根据括号内的要求改写句子,在答题卷相应的横线上填写答案,每空限填一词。(本大题共5分,每格0.5分)1.My father was searching the Internet at that moment.(对画线部分提问)was your father at that moment?2.Simon did not go to the meeting. I went to the meeting instead.(保持意思基本不变)I went to the meeting Simon.3.When did your mother give birth to you? (保持意思基本不变)When you ?4.There was a heavy rain last night.(保持意思基本不变)It last night.5.The weather was fine the day before yesterday. (对画线部分提问)the weather the day before yesterday?
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