# 7.15     Why is $H_{2}O$ a liquid and $H_{2}S$ a gas ?

$H_{2}O$  has oxygen as the centre atom. oxygen is small in size as well as high electronegative when we compare it with sulpher.molecules of water are highly associated through hydrogen bonding which is not present in sulpher.molecules of $H_{2}S$ are connected to each other through weak van der Wal force only. Hence a$H_{2}O$ liquid and $H_{2}S$ a gas.

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