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一、选择题1.“神舟”五号的成功发射与回收,表明我国的载人航天技术已经有了突破性进展.在飞船的火箭推进器中常装有液态肼(用X表示)和液态双氧水(H2O2),它们混合时的化学反应方程式为2H2O2+X=N2+4H2O,则肼(X)的化学式为( ). A.N2H4 B.N2H6 C.NH2 D.N2H4O2
First, multiple-choice questions 1. The successful launch and recovery of the “Shenzhou V” indicates that China’s manned space technology has made breakthrough progress. The spacecraft’s rocket thrusters are often equipped with liquid helium (expressed by X) and liquid hydrogen peroxide. (H2O2), the chemical reaction formula when they are mixed is 2H2O2+X=N2+4H2O, then the chemical formula of 肼(X) is (). A.N2H4 B.N2H6 C.NH2 D.N2H4O2