Question

Which of the following hydride have lowest boiling point?

• A. $H_{2}O$
• B. $H_{2}S$
• C. $H_{2}Se$
• D. $H_{2}Te$

Answer 1

Answer: (B)

$H_{2}S$

Sulfur is not much electronegative as oxygen so that hydrogen sulfide is not as polar as water. Because of this reason comparatively less intermolecular forces exist for $H_{2}S$ and the melting and boiling points are much lower than they are in water and other hydrides of 6th group elements.

Hence option B is correct.