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The boiling points of some compounds of hydrogen with some elements in groups 4 and 6 of the periodic table are given below.

a) Which of the compounds #CH_4# and #SiH_4# has stronger intermolecular forces?
b) Explain why the boiling points of #H_2O# and #H_2S# show different trends from that of #CH_4# and #SiH_4#

Answer Text:
(a) #SiH_4#: This is because it has a higher boiling point.
(b) There is no hydrogen bonding in #CH_4# and #SiH_4# while the hydrogen bond in #H_2O# is stronger than the van der Waal’s forces in #H_2S#.