Question

HBr + H2SO4 = SO2 + Br2 + H2O Did S change oxidation number?

Answer 1

Answer: I think the answer might be yes..

Explanation:

Answer 2

Answer:

Yes

Explanation:

The important rules for oxidation numbers are:

• The oxidation number of H in a compound is +1.
• The oxidation number of O in a compound is usually -2.
• The sum of the oxidation numbers in a compound is zero.

Thus, in your reaction, the oxidation numbers for S are:

$\rm HBr + H_{2}\stackrel{\hbox{+6}}{\hbox{S}}O_{4} \longrightarrow \, \stackrel{\hbox{+4}}{\hbox{S}}O_{2} +Br_{2} + H_{2}O\\\text{The oxidation number of S \large \boxed{\textbf{changes from +6 to +4}} }$