Classify each of the following as a redox reaction or a non-redox reaction.

Zn+CuCl2 - > ZnCl2+Cu HCl+NaOH - > H2O+NaCl 2CO+O2 - > 2CO2 SO3+H2O - > H2SO4

Zn+CuCl₂ - > ZnCl₂+Cu Redox; Zn oxidized (0 to + 2), Cu reduced (+2 to 0)

HCl+NaOH - > H2O+NaCl Non-redox

2CO+O2 - > 2CO2 Redox; C oxidized (+2 to + 4), O reduced (0 to - 2)

SO3+H2O - > H2SO4 Non-redox