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b) Na₂O + H₂SO₄ -> Na₂SO₄ + H₂O
c) Cr₂O₃ + 2H₃PO₄ -> 2CrPO₄ + 3H₂O
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a) ZnO + 2HBr ------> ZnBr2 + H20
b) H2SO4 + Na20 -------> Na2SO4 + H20
C) Cr2O3+2H3PO4 ---------> 2CrPO4 + 3H20