下列叙述中，正确的是
A．依据铝热反应原理，能发生反应2Al＋3MgO  3Mg＋Al2O3 |
| B．在加入铝粉能放出氢气的溶液中：K＋、NH4+、CH3COO-、Cl-一定能够大量共存 |
| C．铁片放入过量的稀硝酸中：3Fe＋8H＋＋2NO3-===3Fe2＋＋2NO↑＋4H2O |
| D．氯化铝溶液中加入过量氨水反应实质是Al3＋＋3NH3·H2O===Al(OH)3↓＋3NH4+ |
相关试题
Charles was alone at home, with_______ looking after him.
| A．someone | B．anyone | C．not one | D．no one |
It is often ______ that human beings are naturally equipped to speak.
| A．said | B．to say | C．saying | D．being said |
酒后驾车是引发交通事故的重要原因。交警对驾驶员进行呼气酒精检测的原理是：橙色的K2Cr2C7酸性水溶液乙醇迅速生成蓝绿色Cr3+。下列对乙醇的描述与此测定原理有关的是
①乙醇沸点低 ②乙醇密度比水小
③乙醇有还原性 ④乙醇是烃的含氧化合物
| A．②④ | B．②③ | C．①③ | D．①④ |
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