ОХ252 Which of the following reactions are redox: Cr2 (

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252. Which of the following reactions are redox:
Cr2 (SO4) 3 + Pb (OH) 2 = Cr (OH) 3 + PbSO4;
Pb + H2O = Pb (OH) 2 + H2 ;
CuJ2 = CuJ + J2;
NH4Cl + NaOH = NaCl + NH3 + H2O.
For redox reactions make a material and an electronic balance.