Ncert Exercises & Solutions

The correct order of the boiling points of \(\mathrm{H}_2 \mathrm{O}, \mathrm{HF}, \text{ and} \ \mathrm{NH}_3\) is:

1. HF > H₂O > NH₃

2. H₂O > HF > NH₃

3. NH₃> HF > H₂O

4. NH₃> H₂O > HF

HINT: Boiling point depends on the extent of hydrogen bonding.

Explanation:

Strength of H-bond is in the order H...F > H...O < H...N.

But each H₂O molecule is linked to four other H₂O molecules through H-bonds whereas each HF molecule is linked only to two other HF molecules. So, the extent of hydrogen boing is strong in molecules.

Hence, Boiling point order is : H₂O > HF > NH_{3

100 .> 20 > -33}

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