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1)P → P2O5 → H3PO4 → Na3PO4 → Ba3(PO4)2

2)H2SO4 → HCl → HNO3 → AgNO3 → Ag2S

3) Na → NaOH → Na3PO4 →NaCl → NaNO3

HNO3 + Al(OH)3 →
HI + MgSO4 →
H3PO4 + AgNO3 →
H2SO4 + NO2 →
HCl + CaSO3 →
HNO3 + AlCl3 →
HBr + Ba(OH)2 →
HCl + Hg →
H2SO4 + FeCl3 →
HNO3 + MgO →
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