Question

Which one of the following products is formed when a mixture of steam, sulphur dioxide gas and oxygen gas (from air) is passed over dry lumps of common salt, the sodium chloride?

• A. $N{a}_{2}S{O}_3$
• B. $C{l}_3$
• C. $NaHS{O}_3$
• D. $N{a}_{2}S{O}_4$

Answer 1

The correct option is D $N{a}_{2}S{O}_4$

Hargreaves process:
$4NaCl\left(s\right)+2S{O}_2\left(g\right)+2H_{2}O\left(g\right)+O_2\left(g\right)⟶2N{a}_{2}S{O}_4+4HCl$