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6 CaO + N 2O 14 Fe 2O 3 + SiO 2
Al 2O 3 + NaOH P 2O 5 + Cl 2O
MgO + H 3PO 4 ZnO + HI
7 Fe 2O 3 + Ni(OH) 2 15 CaO + CO 2
NO + HCl K 2O + HClO 4
K 2O + SeO 2 MgO + HNO 2
8 V 2O 5 + HCl 16 BeO + Ni(OH) 2
CO 2 + Mg(OH) 2 CO + ZnO
BeO + SO 3 KOH + Cr 2O 3

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