Question

The following reactions occurs in a process known as
Contact Process in the manufacturing of H,SO, Which
of the following are combination reactions:
A
So, +H,0 → H,SOA
B SO, +0,SO,
С
S+O, SOM
D
All of these​

Answer 1

A and C: because you have two reactants in each one.
A:SO2+H2O—H2SO4
C:S+O2–SO2