Запишите уравнения реакций соединения, замещения или обмена согласно схемам:

Na₂CO₃⇒CO₂⇒H₂CO₃⇒MgCO₃⇒CO₂
SnCl₂⇒Sn(OH)₂⇒Ca₂SnO₂⇒SnSO₄⇒SnOH⇒SnO
N₂⇒NO⇒NO₂⇒HNO₃⇒Ba(NO₃)₂
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