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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.
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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.


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