Na2ICIVO3 + HCl Na21/2Cl + HCVO3

This is an acid-base reaction (neutralization): Na2CO3 is a base, HCl is an acid.

This is an oxidation-reduction (redox) reaction:

2 NaI + e- 2 Na1/2 (reduction)

CIV - 1 e- CV (oxidation)

Na2CO3 is an oxidizing agent, Na2CO3 is a reducing agent.