Why do CrO_3 and V_2O_5 have low melting poin | vedclass

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Question

(A) $CrO_3$ and $V_2O_5$ exhibit significant covalent character due to the high oxidation state of the transition metal ($Cr^{6+}$ and $V^{5+}$) and t

Vedclass · Accepted Answer

They are covalent in nature.

Vedclass · Answer

(A) $CrO_3$ and $V_2O_5$ exhibit significant covalent character due to the high oxidation state of the transition metal ($Cr^{6+}$ and $V^{5+}$) and the small size of the metal ions. According to Fajan's rule,high charge density leads to polarization of the oxide ion,resulting in covalent bonding. Covalent compounds typically have lower melting points compared to purely ionic compounds because the intermolecular forces are weaker than strong electrostatic ionic attractions.

Why do $CrO_3$ and $V_2O_5$ have low melting points?

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