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JEE Advanced levelSingle correct optionDifficulty 3 of 3cb211

In hexagonal ice, every water molecule is hydrogen bonded to four neighbours. The average number of distinct hydrogen bonds per water molecule (each bond counted once) is

A $4$
B $1$
C $2$
D $3$

Answer: C

Each molecule takes part in

4

hydrogen bonds (two as donor, two as acceptor), but each bond is shared by two molecules. Counting each bond once gives

4/2 = 2

hydrogen bonds per molecule.

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