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Boiling point of group 14 tetrachlorides (XCl₄) increases with molecular weight due to stronger London forces. SnCl₄ (Sn, heaviest) has the highest boiling point among C, Si, Ge, and Sn.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Nomenclature of Elements with Atomic Number >100
Ge (group 14, valence 4) forms GeO₂ with oxygen (valence 2), a stable covalent oxide, unlike GeO, Ge₂O, or GeO₄.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Genesis of Periodic Classification - Dobereiner Newlands Mendeleev
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