Question

When ferrous sulphate crystals are strongly heated, the gas/ vapour not evloved are of:

• A. $S{O}_2$
• B. $S{O}_3$
• C. $O_2$
• D. $H_{2}O$

Answer 1

The correct option is C $O_2$

Ferrous sulphate crystals initially lose water of crystallization. Then on strong heating evolve $S{O}_2$ and $S{O}_3$ .

$FeS{O}_4.7H_{2}O\stackrel{\Delta }{\to }FeS{O}_4+7H_{2}O$

$FeS{O}_4\stackrel{\Delta }{\to }F{e}_2{O}_3+S{O}_2+S{O}_3$

So, $O_2$ is not involved .