HClO4 + H2SO4 → ClO4 + H3SO4
This is an oxidation-reduction (redox) reaction:
SVI + e- → SV (reduction)
ClVII - 1 e- → ClVIII (oxidation)
H2SO4 is an oxidizing agent, HClO4 is a reducing agent.
Warning: Unknown compound 'ClO4'
Warning: Unknown compound 'H3SO4'