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Form 2 Chemistry questions and answers on structure and bonding

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 $SiH_4$

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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 $H_2S$ .