Ответы на вопрос:
Ca⇒cao⇒ca(oh)₂⇒ca(no₃)₂⇒ca(oh)₂ 2ca + o₂=2cao cao + h₂o = ca(oh)₂ ca(oh)₂+ 2hno₃ = ca(no₃)₂+ h₂o ca(no₃)₂+ 2naoh = ca(oh)₂ +2nano₃
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