Расставить коэффициенты в схемах химических реакций и определите тип реакции:

1) СаСО3 + HNО3 = Ca(NO3)2 + CО2 + H2О

2) Al + CuCl2 = AlCl3 + Cu

3) H2SО4 + NaOH = Na2SO4 + H2O

4) Na2O + SО2 = Na2SО3

5) NH3 = N2 + H2
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