The reason symmetric molecules CH₄ and SiH₄ have very low boiling temperatures is that they have no dipole moment.

Name: The reason symmetric molecules CH 4 and SiH 4 have very low boiling temperatures is that they have no dipole moment.
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Symmetric molecules like CH4 and SiH4 have no net dipole moment because the distribution of electron density is even around the molecule, leading to weak van der Waals forces between molecules and consequently low boiling points.

The Reason Symmetric Molecules CH4 and SiH4 Have Very Low

The Reason Symmetric Molecules CH₄ and SiH₄ Have Very Low