制备硅单质时,主要化学反应如下: (1)SiO2 +2C  Si +2CO↑    (

制备硅单质时,主要化学反应如下:

(1)SiO2 +2C  Si +2CO↑  

 (2) Si + 2Cl2  SiCl4

    (3)SiCl4 + 2H2  Si + 4HCl

  下列对上述三个反应的叙述中,不正确的是              

A.(1)(3)为置换反应 B.三个反应的反应物中硅元素均被氧化

C.(2)为化合反应                     D.(1)(2)(3)均为氧化还原反应

答案

B

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