Which of the following reactions are redox reactions?
Check all that apply.
Check all that apply.
4K(s)+O2(g)→2K2O(s)
Mg(s)+Br2(l)→MgBr2(s)
Al(s)+3Ag+(aq)→Al3+(aq)+3Ag(s)
SO3(g)+H2O(l)→H2SO4(aq)