Question

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Si + KOH + O2 = /K2SiO3/

Answer 1

Si + KOH + O₂ = /K₂SiO₃/
1 | Si⁰ - 4e + 6OH⁻ = Si⁺⁴O₃²⁻ + 3H₂O
1 | O₂ + 4e + 2H₂O = 4 OH⁻
Si + O₂ + 2OH⁻ = SiO₃²⁻ + 2H₂O

Si + 2KOH + O₂ = K₂SiO₃ + H₂O