balance the equation
(a) Cu(NO3)2-------- CuO + NO2 +O2
(b) ZnS + O2 ----- ZnO + SO2
(c) Mg(NO3)2+ KOH -------Mg(OH)2 + KNO3
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(a)2Cu(NO3)2-------- 2CuO + 4NO2 +O2
(b) 2ZnS + 3O2 ----- 2ZnO +2SO2
(c) Mg(NO3)2+ 2KOH -------Mg(OH)2 + 2KNO3
(b) 2ZnS + 3O2 ----- 2ZnO +2SO2
(c) Mg(NO3)2+ 2KOH -------Mg(OH)2 + 2KNO3
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