1/5单选题
难度：
1.
铝元素的氧化物化学式为Al2O3，若Al的化合价不变，则铝元素的氯化物的化学式为_____
| A | AlCl |
| B | Al3Cl |
| C | AlCl2 |
| D | AlCl3 |
- 提示1：
- PHA+5qC55o2uT+eahOWMluWQiOS7t+axgkFs55qE5YyW5ZCI5Lu35Li6KzM8L3A+
- 提示2：
- PHA+Q2zlnKjmsK/ljJbpk53kuK3nmoTljJblkIjku7fmmK8tMeS7tzwvcD4=
正确答案：RA==
PHA+6K6+77yaQWznmoTljJblkIjku7fkuLp444CCPC9wPjxwPjJ4K++8iC0y77yJw5czPTA8YnI+5rGC5b6XeD0rMzxicj48L3A+PHA+6ICMQ2znmoTlnKjmsK/ljJbpk53kuK3mmL4tMeS7t++8jOW+iOWuueaYk+efpemBk+awr+WMlumTneS4uu+8mkFsQ2w8c3ViPjM8L3N1Yj7jgII8L3A+
2/5单选题
难度：
2.
现有H2S、S、M、SO3四种物质，是按硫元素的化合价由低到高排列的，其中M这种物质的化学式可能是
| A | H2SO4 |
| B | H2SO3 |
| C | Na2S |
| D | Na2SO4 |
- 提示1：
- PHA+5Y+v5Lul5YWI6K+V552A5YiG5Yir5rGC5Ye6SDxzdWI+Mjwvc3ViPlPjgIFT44CBU088c3ViPjM8L3N1Yj7kuK1T55qE5YyW5ZCI5Lu344CCPC9wPg==
- 提示2：
- PHA+5YaN5YiG5Yir5rGC5Ye65ZCE6YCJ6aG55LitU+eahOWMluWQiOS7t+WNs+WPr+mAieWHuuOAgjxicj48L3A+
正确答案：Qg==
PHA+SDxzdWI+Mjwvc3ViPlPkuK3noavlhYPntKDnmoTljJblkIjku7fkuLotMu+8m1PnmoTljJblkIjku7fkuLow77ybU088c3ViPjM8L3N1Yj7kuK3noavnmoTljJblkIjku7fkuLorNu+8mzwvcD48cD5N5Lit55qE56Gr55qE5YyW5ZCI5Lu35bqU5ZyoMOWSjCs25LmL6Ze044CCPC9wPjxwPkg8c3ViPjI8L3N1Yj5TTzxzdWI+NDwvc3ViPuOAgUg8c3ViPjI8L3N1Yj5TTzxzdWI+Mzwvc3ViPuOAgU5hPHN1Yj4yPC9zdWI+U+OAgU5hPHN1Yj4yPC9zdWI+U088c3ViPjQ8L3N1Yj7kuK3noavnmoTljJblkIjku7fliIbliKvkuLorNuOAgSs044CBLTLjgIErNu+8jOaJgOS7pUg8c3ViPjI8L3N1Yj5TTzxzdWI+Mzwvc3ViPuS4uuato+ehrumAiemhueOAgjwvcD4=
3/5单选题
难度：
3.
在①N2O5；②x；③N2O3；④N2；⑤NH3五种物质中，它们是按照氮元素的化合价由高到低顺序排列的，则X可能是下列物质中的
| A | NO2 |
| B | NaNO2 |
| C | NH4Cl |
| D | N2O |
- 提示1：
- PHA+5Y+v5Lul5YWI6K+V552A5YiG5Yir5rGC5Ye64pGgTjxzdWI+Mjwvc3ViPk88c3ViPjU8L3N1Yj7vvJvikaJOPHN1Yj4yPC9zdWI+TzxzdWI+Mzwvc3ViPu+8m+KRo048c3ViPjI8L3N1Yj7vvJvikaROSDxzdWI+Mzwvc3ViPuS4rU7nmoTljJblkIjku7fjgII8YnI+PC9wPg==
- 提示2：
- PHA+PHNwYW4+5YaN5YiG5Yir5rGC5Ye65ZCE6YCJ6aG55LitTueahOWMluWQiOS7t+WNs+WPr+mAieWHuuOAgjwvc3Bhbj48YnI+PC9wPg==
正确答案：QQ==
PHA+5qC55o2u5YyW5ZCI5Lu355qE5Luj5pWw5ZKM5Li6MO+8jOWIl+WHuuaWueeoi+axguWHuumimOW5suS4rU7nmoTljJblkIjku7fliIbliKvmmK8rNe+8jCszLDDvvIwtM++8jOmAiemhueS4reeahE7nmoTljJblkIjku7fliIbliKvmmK8rNO+8jCsz77yMLTPvvIwrMe+8jOaJgOS7pemAiUE8L3A+
4/5单选题
难度：
4.
下列有关化合价的叙述，正确的是（ ）
| A | 化合价是元素与元素间化合时表现出来的性质 |
| B | 任何元素都可能显正价和负价 |
| C | 一种元素在不同化合物中可能有多种化合价，但在一种物质中只能有一种化合价 |
| D | 在原子团中元素正负化合价的代数和为零 |
- 提示1：
- PHA+QumUmeivr++8jOWmgkblhYPntKDjgII8YnI+PC9wPg==
- 提示2：
- PHA+Q+mUmeivr++8jOWmgk5IPHN1Yj4zPC9zdWI+Tk88c3ViPjM8L3N1Yj7jgII8YnI+PC9wPg==
- 提示3：
- PHA+Jm5ic3A7ROmUmeivr++8jOazqOaEj+WOn+WtkOWboueahOWQq+S5ieOAgjxicj48L3A+
正确答案：QQ==
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
5/5单选题
难度：
5.
现有
、
、
、
四种元素，当它们的化合价不变时，组成的化合物最多有几种
| A | 7 |
| B | 6 |
| C | 5 |
| D | 3 |
- 提示1：
- PHA+5qC55o2u5YyW5ZCI54mp5Lit5q2j6LSf5YWD57Sg5YyW5ZCI5Lu35Luj5pWw5ZKM5Li66Zu277yM5q2j5Lu35YWD57Sg5LiO6LSf5Lu35YWD57Sg57uT5ZCI57uE5oiQ5YyW5ZCI54mp44CC5YiZKzHku7dI5YWD57Sg44CBKzbku7dT5YWD57Sg44CBKzHku7dOYeWFg+e0oOWIhuWIq+S4ji0y5Lu355qET+WFg+e0oOWMluWQiOOAgjxicj48L3A+
- 提示2：
- PHA+5Y+m5aSW77yMSOOAgU/lhYPntKDnmoTljp/lrZDlvaLmiJAtMeS7t+eahE9IPHN1cD4tPC9zdXA+5LiOTmHlhYPntKDvvIxT44CBT+WFg+e0oOeahOWOn+WtkOW9ouaIkC0y5Lu355qEU088c3ViPjQ8L3N1Yj48c3VwPjItPC9zdXA+5LiOSOOAgU5h5YWD57Sg57uE5oiQ5YyW5ZCI54mp77yOPGJyPjwvcD4=
正确答案：QQ==
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