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Identifying each of the following chemical reaction as synthesis (S), decomposition (D), single replacement (SR), double replacement (DR) or combustion (C)
1) H2O1 (l) + Fe (s) ---> Fe2O3 (s) + H2 (g) __________
2) Ca1(O1H1)2 (aq) + H1(N1O3)1 (aq) --> H2O1 (g) + Ca1(N1O3)2 (aq) __________
3) Na2O1 (s) + C1O2 (g) ---> Na2(C1 O3)1 (s) ___________
4) H2 (g) + N2 (g) ---> N1H3 (g) __________