Question

Why is boiling point of water more than that of hydrogen fluoride?

Answer 1

F has more unshared electron pairs and is very electronegative, so HH of another HFHF molecule can HH-bond with it.

HFHF has normal boiling point of 19.5 ∘C19.5 ∘C while H2OHX2O, as you know, has normal boiling of 100 ∘C

Answer 2

"HEY THERE "

HERE IS YOUR ANSWER"

Fluoride has more unshared electron pairs and is very electronegative, so HH of another HFHF molecule can HH-bond with it.

HFHF has normal boiling point of 19.5 ∘C19.5 ∘C while H2OHX2O, as you know, has normal boiling of 100 ∘C100 ∘C.

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