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Q.
Maximum number of hydrogen bonding is in :
Haryana PMTHaryana PMT 2006
Solution:
In every $H_{2}O$ molecule each $H$-atoms is involved in hydrogen-bond with $O$-atoms of other molecule, while $O$-atoms is involved in two hydrogen-bonds with two $H$-atoms of other molecules. Thus, every $H_{2}O$ molecule involves four hydrogen-bonds.