Among the hydrides formed by the group 16 ele | vedclass

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(A) The group $16$ hydrides $(H_2O, H_2S, H_2Se, H_2Te)$ show a trend in boiling points. $H_2O$ has an exceptionally high boiling point compared to th

Vedclass · Accepted Answer

$H_2O$ molecules are associated due to intermolecular hydrogen bonds

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(A) The group $16$ hydrides $(H_2O, H_2S, H_2Se, H_2Te)$ show a trend in boiling points. $H_2O$ has an exceptionally high boiling point compared to the other hydrides of the group. This is due to the presence of extensive intermolecular hydrogen bonding in $H_2O$ molecules,which is not possible in other hydrides like $H_2S$ due to the lower electronegativity of the central atom. Therefore,$H_2O$ molecules are associated,leading to higher energy requirements for vaporization.

Among the hydrides formed by the group $16$ elements,only $H_2O$ has an abnormally low volatility (high boiling point). This is so because

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