Hot conc. H<sub>2 A. Cu

B. S

C. C

D. Zn</sub>

H₂SO₄H₂O + SO₂

C + 2O₂CO₂

And the net reaction is obtained by multiplying reaction 1 by 2.

Addition of reaction 1 and reaction 2

C + 2H₂SO₄CO₂ + 2SO₂ + 2H₂O

The gaseous product formed during the oxidation of carbon by H₂SO₄ are:

CO₂ AND SO₂.

Hence the correct option is (iii)