The Boiling Point Of NH3 H2O And HF Are Exceptionally Higher Explain

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The boiling point of NH3 H2O and HF are exceptionally higher explain

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Boiling point depends upon the intermolecular forces of attraction ,which in turn depends upon the difference in electronegativities of the combined species.

In case of HF, difference in electronegativity of hydrogen and fluorine is greater. Hence HF molecule is highly polarized, due to this ,molecules are associated strongly by strong intermolecular hydrogen bonds.Thus higher boiling point is recorded for HF.

In NH₃,difference in electronegativity of nitrogen and hydrogen is comparatively lesser.Hence in NH₃,intermolecular hydrogen bonds are relatively weaker.Thus boiling point of NH₃ is lesser than that of HF. I assume that your question relates to the fact that these three small molecules have boiling points “higher than other small molecules with similar molecular weight.” The answer is that only molecules with hydrogen atoms covalently bonded to O, N, or F can participate in hydrogen bonding. Hydrogen bonding isn’t particularly strong, but when you have a lot of hydrogen bonds it makes a real difference in the energy needed to move the molecules from liquid to the gas phase.

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The order of boiling point of NH3,H2O,HFandPH3 is

Q. H2O has a higher boiling point than HF because:Q.

Question 04

Hydrogen bonds are formed in many compounds e.g., H2O,HF,NH3. The boiling point of such compounds depends to a extent on the strength of hydrogen bond and the number of hydrogen bonds. The correct decreasing order of the boiling points above compounds is

(a) HF>H2O>NH3

(b) H2O>HF>NH3

(c) NH3>HF>H2O

(d) NH3>H2O>HF

Q. H2O has a higher boiling point than HF. Which among the following is the right reason ?Q.

Assertion––––––––––– (A): The boiling point of HF is higher than that of H2O Reason––––––––– (R): The hydrogen bond strength in HF is lower than that in H2O

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