identify the three reactions as either synthesis, decomposition, single replacement, double replacement, or combustion:

2Zn(s) + I2(g) –> 2ZnI
2H2O2(l) —-> O2(g) + 2H2O(l) 
2Mg(s) + Pb(NO3)4 —> Pb(s) + 2Mg(NO3)2
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