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In H2O, hydrogen bonds are present between the atoms which is more stronger than the weak vanderwaal force that present in H2S. Hence H2O is in liquid state where as H2S is in gaseous state.
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In H2O , hydrogen bonding takes place , which is quite strong , H bonding takes place only with 3 high electronegative elements i.e. F , O , N . & since its oxygen , hydrogen bonding takes place . If we talk about H2S , first S is not that much electronegative , second it has a big size than O , so bonding takes place very weak , thats why , & forces in H2S is named as vanderwall forces
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