Какие вещества обозначены « Х» и «Y» в цепочке превращений:
Ca + X → CaO CaO + Y → Ca(OH)2

  1. X – H2O; Y –O2
  2. X – H2; Y - O2
  3. X – O2; Y – H2
  4. X – O2; Y – H2O

📝 Detailed explanation

Ca + O₂ → CaO; CaO + H₂O → Ca(OH)₂.
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