Among NaF , NaCl , NaBr and Nal , the NaF has highest melting point becausea)It has maximum ionic characterb)It has minimum ionic characterc)It has associated moleculesd)It has least molecular weightCorrect answer is option 'A'. Can you explain this answer?

Question

Answer

Explanation:

NaF, NaCl, NaBr, and NaI are all ionic compounds, which means they are formed by the transfer of electrons from the metal to the non-metal. The melting point of these compounds is directly proportional to the strength of the ionic bond between the metal and non-metal.

Ionic Character:

The ionic character of a compound is a measure of the degree to which electrons are transferred from the metal to the non-metal. The greater the difference in electronegativity between the metal and non-metal, the greater the ionic character of the compound. NaF has the highest ionic character among the given options because fluoride ion is the most electronegative of all halide ions.

Melting Point:

The melting point is the temperature at which a solid changes to a liquid. The melting point of an ionic compound depends on the strength of the ionic bond between the metal and non-metal. The stronger the ionic bond, the higher the melting point of the compound.

NaF has the highest melting point among the given options because it has the highest ionic character due to the small size and high electronegativity of the fluoride ion, which results in a strong ionic bond between Na+ and F- ions.

Conclusion:

NaF has the highest melting point among the given options because it has the maximum ionic character due to the small size and high electronegativity of the fluoride ion.

Answer

Since electronegativity of F is high compared to Cl, Br and I, F forms an ionic bond with Na which requires very high energy to break. Hence NaF bond is strong. As a consequence NaF has high melting point.

Answer

See it can be explain on the basis of electronegativity. The greater EN difference between two atom greater will be the ionic character.
The EN difference for NaF,NaCl,NaBr and NaI is 3.1, 2.1, 1.7 and 1.4 respectively (all values are according to Pauling's scale). So, this values clarify that the ionic character order will be as follows
NaF⟩NaCl⟩NaBr⟩NaI.
Hence the Na—F bond is strongest i.e the greater melting point

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