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Arrange the following in order of proper...

Arrange the following in order of property indicated for set:
`H_(2)O, H_(2)S, H_(2)Se, H_(2)Te ` - increasing acidic character

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As the size of the element (E) increas from O to Te, the bond length of the H-X bond increases and hence bond dissociation enthalpy of the H-E bond decreases. In other words, the tendency of the H-E bond to dissociate to give `H^(+)` ions inncreases from `H_(2)O` to HeTe. As a result, acid strength increases from `H_(2)O` to `H_(2)Te`, i.e., acid strength increases in the order : `H_(2)O lt H_(2)S lt H_(2)Se lt H_(2)Te`.
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