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Q.
Which of the following hydrides has the lowest boiling point ?
Chemical Bonding and Molecular Structure
Solution:
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 $H_2S$ and the melting and boiling points are much lower than they are in water and other hydrides of 6th group elements.