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Give reasons for the following: (i) Bond enthalpy of F2 is lower than that of Cl2. (ii) PH3 has lower boiling point than NH3. - Chemistry

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Give reasons for the following:

(i) Bond enthalpy of F2 is lower than that of Cl2.

(ii) PH3 has lower boiling point than NH3.

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Solution

(i) Bond enthalpy of F2 is lower than that of Cl2 because F atom is small in size and due to this the electron-electron repulsions between the lone pairs of F-F are very large. Thus, the bond dissociation energy of F2 is lower than that of Cl2.

(ii) PH3 has lower boiling point than NH3 because NH3 molecule possess intermolecular hydrogen bondings which binds them strongly whereas PH3 has weaker Vander Waal’s forces. Thus, PH3 has lower boiling point than NH3.

Concept: Bonding in Coordination Compounds - Introduction
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