SiO2->Si->Mg2Si->SiH4

Question

SiO2->Si->Mg2Si->SiH4

Answer 1

1) SiO₂  + 2C = Si +2CO ↑
(Или SiO₂ + 2Mg = Si + 2MgO)
2)Si + 2 Mg = Mg₂Si
3) Mg₂Si + 4 H₂O = 2Mg (OH)₂ + SiH₄