H2SO4 (aq) + 5 NaNO2 (aq) + 2 KIO3 (aq) → H2O (l) + K2SO4 (aq) + I2 (s) + 5 NaNO3 (aq)
This is an oxidation-reduction (redox) reaction:
2 IV + 10 e- → 2 I0 (reduction)
5 NIII - 10 e- → 5 NV (oxidation)
KIO3 is an oxidizing agent, NaNO2 is a reducing agent.
This is a precipitation reaction: I2 is the formed precipitate.