Short Answer TypeH2S is less acidic than H2Te because as we movedown the group,the bond dissociation enthalpy decreases i.e it becomes easy to dissociate or
break the bonds(due to the increasing size down the group).So,with this concept in terms of hydrides,it becomes easy for H2Te to remove H easy
as H+ because of its low bond dissociation enthalpy(as mentioned before).Therefore , H2Te is
more acidic.
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