Balance the equations below assuming they occur in a basic solution.
(a) SO₃²⁻(aq) + Cu(OH)₂(s) -> SO₄²⁻(aq) + Cu(OH)(s)
(b) O₂(g) + Mn(OH)₂(s) -> MnO₂(s)
(c) NO₃⁻(aq) + H₂(g) -> NO(g)