Which hydride of Group $16$ has the highest boiling point?

A $H X_{2} Te$
B $H X_{2} O$
C $H X_{2} Se$
D $H X_{2} S$

Answer: B

Water forms extensive hydrogen bonds because oxygen is small and highly electronegative. The heavier hydrides have only dipole and dispersion forces. So

H X_{2} O

has the highest boiling point despite its lowest molar mass.

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Which hydride of Group 16 has the highest boiling point?

Answer: B

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Which hydride of Group $16$ has the highest boiling point?