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1.<span style="font-family: 'Times New Roman';">下列有关氧化还原反应的叙述正确的是</span><span style="font-family: 'Times New Roman';">（　　）</span></div><br/><br/>
A.<span style="font-family: 'Times New Roman';">有单质参加或生成的化学反应一定是氧化还原反应</span></div><br/>
B.<span style="font-family: 'Times New Roman';">有单质生成的分解反应属于氧化还原反应，因为构成该单质的元素的化合价必然发生变化</span></div><br/>
C.<span style="font-family: 'Times New Roman';">被氧化的物质得到电子或电子对偏向，被还原的物质失去电子或电子对偏离</span><br/>
D.<span style="font-family: 'Times New Roman';">氧化还原反应中有一种元素被氧化时，一定有另一种元素被还原</span><br/>
++++++++++++++++++++++++++<br/>
<b>正确答案</b>: ['B']<br/>
解析:<div class="mst-editor-mce-root-block"><span style="font-family: 'Times New Roman';">A</span><span style="font-family: 'Times New Roman';">．</span><span style="font-family: 'Times New Roman';">同素异形体之间的转化有单质参加，但无化合价变化，不属于氧化还原反应，故</span><span style="font-family: 'Times New Roman';">A</span><span style="font-family: 'Times New Roman';">错误；</span><br /><span style="font-family: 'Times New Roman';">B</span><span style="font-family: 'Times New Roman';">．</span><span style="font-family: 'Times New Roman';">化合物分解生成单质，一定存在化合价的变化，一定属于氧化还原反应，故</span><span style="font-family: 'Times New Roman';">B</span><span style="font-family: 'Times New Roman';">正确；</span><br /><span style="font-family: 'Times New Roman';">C</span><span style="font-family: 'Times New Roman';">．</span><span style="font-family: 'Times New Roman';">被氧化的物质有元素化合价的升高，该物质失去电子或电子对偏离，被还原的物质有元素化合价的降低，该物质得到电子或电子对偏向，故</span><span style="font-family: 'Times New Roman';">C</span><span style="font-family: 'Times New Roman';">错误；</span><br /><span style="font-family: 'Times New Roman';">D</span><span style="font-family: 'Times New Roman';">．</span><span style="font-family: 'Times New Roman';">氧化还原反应可以发生在同种元素之间，如在<img class="Wirisformula" style="vertical-align: -4px;" role="math" src="http://file.ewt360.com/file/1400830633294913977" data-fileid="" data-type="mathType" data-wmf="http://file.ewt360.com/file/1400830633294921787" data-bin="http://file.ewt360.com/file/1400830633294905527" data-id="682169" data-client="true" /></span><span style="font-family: 'Times New Roman';">反应中，只有</span><img class="Wirisformula" style="vertical-align: -1px;" role="math" src="http://file.ewt360.com/file/1400412080141984079" data-fileid="1399303403054698998" data-type="mathType" data-wmf="http://file.ewt360.com/file/1400412062962106534" data-bin="http://file.ewt360.com/file/1400412062962131732" data-id="248" /><span style="font-family: 'Times New Roman';">元素化合价发生变化，故</span><span style="font-family: 'Times New Roman';">D</span><span style="font-family: 'Times New Roman';">错误。</span></div><br/>
省流:[['B']]<br/>
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2.<span style="font-family: 宋体, SimSun;">下列变化中必须要加入还原剂才能实现的是（　　）</span></div><br/><br/>
A.<img class="Wirisformula" style="vertical-align: -5px;" role="math" src="http://file.ewt360.com/file/1400412080141992188" data-fileid="1399303403054699003" data-type="mathType" data-wmf="http://file.ewt360.com/file/1400412071552041378" data-bin="http://file.ewt360.com/file/1400412071552049242" data-id="722828" /></div><br/>
B.<img class="Wirisformula" style="vertical-align: -5px;" role="math" src="http://file.ewt360.com/file/1400412080142000902" data-fileid="1399303403054699004" data-type="mathType" data-wmf="http://file.ewt360.com/file/1400412071552057597" data-bin="http://file.ewt360.com/file/1400412071552041379" data-id="5407" /><br/>
C.<img class="Wirisformula" style="vertical-align: -4px;" role="math" src="http://file.ewt360.com/file/1400412080142000901" data-fileid="1399303403054699005" data-type="mathType" data-wmf="http://file.ewt360.com/file/1400412071552065673" data-bin="http://file.ewt360.com/file/1400412071552057598" data-id="14725" /><br/>
D.<img class="Wirisformula" style="vertical-align: -5px;" role="math" src="http://file.ewt360.com/file/1400412080141975802" data-fileid="1399303403054699006" data-type="mathType" data-wmf="http://file.ewt360.com/file/1400412080141984078" data-bin="http://file.ewt360.com/file/1400412080142000900" data-id="6881" /><br/>
++++++++++++++++++++++++++<br/>
<b>正确答案</b>: ['D']<br/>
解析:<div class="mst-editor-mce-root-block"><span style="font-family: 宋体, SimSun;">A</span><span style="font-family: 宋体, SimSun;">．</span><span style="font-family: 宋体, SimSun;">氯酸钾在二氧化锰催化作用下生成氯化钾和氧气，只需自身氧化还原就能实现，</span><span style="font-family: 宋体, SimSun;">A</span><span style="font-family: 宋体, SimSun;">错误；</span><br /><span style="font-family: 宋体, SimSun;">B</span><span style="font-family: 宋体, SimSun;">．</span><img class="Wirisformula" style="vertical-align: -5px;" role="math" src="http://file.ewt360.com/file/1400412080141984080" data-fileid="1399303403054698999" data-type="mathType" data-wmf="http://file.ewt360.com/file/1400412062962106535" data-bin="http://file.ewt360.com/file/1400412062962114913" data-id="5407" /><span style="font-family: 宋体, SimSun;">中，各元素化合价均不变，不需要加入还原剂，</span><span style="font-family: 宋体, SimSun;">B</span><span style="font-family: 宋体, SimSun;">错误；</span><br /><span style="font-family: 宋体, SimSun;">C</span><span style="font-family: 宋体, SimSun;">．</span><img class="Wirisformula" style="vertical-align: -4px;" role="math" src="http://file.ewt360.com/file/1400412080141992187" data-fileid="1399303403054699000" data-type="mathType" data-wmf="http://file.ewt360.com/file/1400412062962123530" data-bin="http://file.ewt360.com/file/1400412062962106536" data-id="14725" /><span style="font-family: 宋体, SimSun;">中，氯元素由</span><img class="Wirisformula" style="vertical-align: 0px;" role="math" src="http://file.ewt360.com/file/1400412080141975800" data-fileid="1399303403054699001" data-type="mathType" data-wmf="http://file.ewt360.com/file/1400412071552065670" data-bin="http://file.ewt360.com/file/1400412071552057595" data-id="3116" /><span style="font-family: 宋体, SimSun;">价变为</span><span style="font-family: 宋体, SimSun;">0</span><span style="font-family: 宋体, SimSun;">价，化合价升高，需要加入氧化剂才能实现，</span><span style="font-family: 宋体, SimSun;">C</span><span style="font-family: 宋体, SimSun;">错误；</span><br /><span style="font-family: 宋体, SimSun;">D</span><span style="font-family: 宋体, SimSun;">．</span><img class="Wirisformula" style="vertical-align: -5px;" role="math" src="http://file.ewt360.com/file/1400412080141975801" data-fileid="1399303403054699002" data-type="mathType" data-wmf="http://file.ewt360.com/file/1400412071552049241" data-bin="http://file.ewt360.com/file/1400412071552065671" data-id="6881" /><span style="font-family: 宋体, SimSun;">中，铁元素化合价降低，需要加入还原剂才能实现，</span><span style="font-family: 宋体, SimSun;">D</span><span style="font-family: 宋体, SimSun;">正确；</span></div><br/>
省流:[['D']]<br/>
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