Question

Which of the following can be used to synthesize $S{O}_2$ ?

• A. $Fe{S}_2+O_2$
• B. $FeS+O_2$
• C. $H_{2}S+O_2$
• D. $S+O_2$

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A

$Fe{S}_2+O_2$

B

$FeS+O_2$

C

$H_{2}S+O_2$

D

$S+O_2$

Sulphide ores are strongly heated in the presence of air to convert them into their corresponding oxide forms.
You might recall that this process is called roasting.
$4Fe{S}_2+11O_2\to 2F{e}_2{O}_3+8S{O}_2$
$4FeS+7O_2\to 2F{e}_2{O}_3+4S{O}_2$

When hydrogen sulphide is burnt in air, sulphur dioxide and water are formed
$2H_{2}S+3O_2\to 2H_{2}O+2S{O}_2$

Sulphur dioxide can also be formed by burning sulphur in air:
$S+O_2\to S{O}_2$