Which of the following is agas at room temperature?

Options

A. `PoO_(2)`
B. `TeO_(2)`
C. `SeO_(2)`
D. `SO_(2)`

Answer

4

Explanation

Sulphur oxide is a colourless ,poisonous gas ,bpt `-10^(@ )C` with a pungent smell while other dioxides are solids at room temperature.
Sulpher dioxide exists as discrete `SO_(2)` molecules even in the solid state .`SeO_(2)` in the gas phase has an angular structure similar to that `SO_(2)` but in the solid state has an infinite covalent chain structure:

`TeO_(2)` in the solid state has a layer structure consisting of `TeO_(4)` units.