H2 + Cl2 = 2 HCl
H2 + S = H2S
H2 + CuO = Cu + H2O
3 H2 + WO3 = 3 H2O + W
H2SO4 + 2 Na = H2 + Na2SO<span>4
</span>
P (+5)
PH3 (-3)
HPO3 (+5)
H3PO4 (<span>+5)</span>
Mr(CaCl2) = 40 + 35.5*2=111
BeO - амфотерный оксид
BeO + 2HCl = BeCl2 + H2O
BeO + 2NaOH + H2O = Na2[Be(OH)4]
BaO - основной оксид
BaO + 2HCl = BaCl2 + H2O
Pb2O4, K2O, P2O5, Zn2O3, Au2O3, CL2O6, S2O6