Завершите и уравняйте хим. реакции:
1) Fe2O3 + HCl 
2) MgO + HNO3
3) MgO + H3PO4
4) Fe2O3 + HNO3
5) NaOH + P2O5
6) Ca ( OH ) 2 + N2O5 
7) KOH + SO3
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